From e58136b18052e33ec8f3731c031eee003401542c Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 19:30:03 -0700
Subject: [PATCH 01/24] update node/npm and reinstall packages

---
 package-lock.json | 3259 +++++++++++++++++++++++++++++----------------
 1 file changed, 2097 insertions(+), 1162 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index d2ddb0287..1aaa5c4f7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,14 +1,45 @@
 {
   "name": "@slack/client",
-  "version": "4.0.0-beta.1",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@fimbul/bifrost": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@fimbul/bifrost/-/bifrost-0.4.0.tgz",
+      "integrity": "sha512-s4YVtL0xXdEZCu9p6F+mhNTnR8N29jGrTNSMceYLunprbbQm5dHgEZ5rtJ7LZ3nELiis2ogwkMreRsm6aRrKsw==",
+      "dev": true,
+      "requires": {
+        "@fimbul/ymir": "0.4.0",
+        "get-caller-file": "1.0.2",
+        "tslib": "1.9.0"
+      }
+    },
+    "@fimbul/ymir": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@fimbul/ymir/-/ymir-0.4.0.tgz",
+      "integrity": "sha512-qY+jYvoHqRmImS6TjQzsjun8ETPsDj1v+tdgR41edMWX5wsdant4qikabg3dASZ3Yr+kv3ja2Z7QoDGcj+5otQ==",
+      "dev": true,
+      "requires": {
+        "inversify": "4.11.1",
+        "reflect-metadata": "0.1.12",
+        "tslib": "1.9.0"
+      }
+    },
     "@sindresorhus/is": {
       "version": "0.7.0",
       "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.7.0.tgz",
       "integrity": "sha512-ONhaKPIufzzrlNbqtWFFd+jlnemX6lJAgq9ZeiZtS7I1PIf/la7CW4m83rTXRnVnsMbW2k56pGYu7AUFJD9Pow=="
     },
+    "@sinonjs/formatio": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@sinonjs/formatio/-/formatio-2.0.0.tgz",
+      "integrity": "sha512-ls6CAMA6/5gG+O/IdsBcblvnd8qcO/l1TYoNeAzp3wcISOxlPXQEus0mLcdwazEkWjaBdaJ3TaxmNgCLWwvWzg==",
+      "dev": true,
+      "requires": {
+        "samsam": "1.3.0"
+      }
+    },
     "@types/chai": {
       "version": "4.1.2",
       "resolved": "https://registry.npmjs.org/@types/chai/-/chai-4.1.2.tgz",
@@ -30,7 +61,7 @@
       "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-2.2.1.tgz",
       "integrity": "sha512-JAMFhOaHIciYVh8fb5/83nmuO/AHwmto+Hq7a9y8FzLDcC1KCU344XDOMEmahnrTFlHjgh4L0WJFczNIX2GxnQ==",
       "requires": {
-        "@types/node": "9.4.1"
+        "@types/node": "9.4.7"
       }
     },
     "@types/got": {
@@ -38,7 +69,7 @@
       "resolved": "https://registry.npmjs.org/@types/got/-/got-7.1.7.tgz",
       "integrity": "sha512-quhlNPGIkaRyO4PnEuP9pEkUPktjfrvPESENGOhiEzgOUNbunETSQXY5bkZY+Bb/J9V5p/f50Rh1eDklD4Z2FQ==",
       "requires": {
-        "@types/node": "9.4.1"
+        "@types/node": "9.4.7"
       }
     },
     "@types/is-stream": {
@@ -46,7 +77,7 @@
       "resolved": "https://registry.npmjs.org/@types/is-stream/-/is-stream-1.1.0.tgz",
       "integrity": "sha512-jkZatu4QVbR60mpIzjINmtS1ZF4a/FqdTUTBeQDVOQ2PYyidtwFKr0B5G6ERukKwliq+7mIXvxyppwzG5EgRYg==",
       "requires": {
-        "@types/node": "9.4.1"
+        "@types/node": "9.4.7"
       }
     },
     "@types/loglevel": {
@@ -61,9 +92,9 @@
       "dev": true
     },
     "@types/node": {
-      "version": "9.4.1",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-9.4.1.tgz",
-      "integrity": "sha512-9ESUxmXt1Isc1xKfDBZ7tpULyTPY5ZCywcfvQTXoLUqP+n4D+MBH+0n75hdzrcmfCc3eWByOi27+GLmMuAvcUA=="
+      "version": "9.4.7",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-9.4.7.tgz",
+      "integrity": "sha512-4Ba90mWNx8ddbafuyGGwjkZMigi+AWfYLSDCpovwsE63ia8w93r3oJ8PIAQc3y8U+XHcnMOHPIzNe3o438Ywcw=="
     },
     "@types/p-cancelable": {
       "version": "0.3.0",
@@ -111,7 +142,7 @@
       "integrity": "sha512-J56Wn8j7ovzmlrkUSPXnVRH+YXUCGoVokiB49QIjz+yq0234guOrBvF/HHrqrJjnY4p5oq+q6xAxT/7An6SeWQ==",
       "requires": {
         "@types/events": "1.2.0",
-        "@types/node": "9.4.1"
+        "@types/node": "9.4.7"
       }
     },
     "ajv": {
@@ -157,16 +188,19 @@
       "dev": true
     },
     "ansi-regex": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg=",
       "dev": true
     },
     "ansi-styles": {
-      "version": "2.2.1",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
-      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
-      "dev": true
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
+      "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+      "dev": true,
+      "requires": {
+        "color-convert": "1.9.1"
+      }
     },
     "any-observable": {
       "version": "0.2.0",
@@ -181,9 +215,9 @@
       "dev": true
     },
     "argparse": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
-      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
       "dev": true,
       "requires": {
         "sprintf-js": "1.0.3"
@@ -275,6 +309,33 @@
         "chalk": "1.1.3",
         "esutils": "2.0.2",
         "js-tokens": "3.0.2"
+      },
+      "dependencies": {
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+          "dev": true
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+          "dev": true,
+          "requires": {
+            "ansi-styles": "2.2.1",
+            "escape-string-regexp": "1.0.5",
+            "has-ansi": "2.0.0",
+            "strip-ansi": "3.0.1",
+            "supports-color": "2.0.0"
+          }
+        },
+        "supports-color": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-2.0.0.tgz",
+          "integrity": "sha1-U10EXOa2Nj+kARcIRimZXp3zJMc=",
+          "dev": true
+        }
       }
     },
     "babylon": {
@@ -324,9 +385,9 @@
       }
     },
     "brace-expansion": {
-      "version": "1.1.8",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.8.tgz",
-      "integrity": "sha1-wHshHHyVLsH479Uad+8NHTmQopI=",
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
       "dev": true,
       "requires": {
         "balanced-match": "1.0.0",
@@ -334,9 +395,9 @@
       }
     },
     "browser-stdout": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
-      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
       "dev": true
     },
     "builtin-modules": {
@@ -353,6 +414,32 @@
       "requires": {
         "dicer": "0.2.5",
         "readable-stream": "1.1.14"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "1.1.14",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
+          "dev": true,
+          "requires": {
+            "core-util-is": "1.0.2",
+            "inherits": "2.0.3",
+            "isarray": "0.0.1",
+            "string_decoder": "0.10.31"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true
+        }
       }
     },
     "cache-point": {
@@ -393,6 +480,12 @@
       "integrity": "sha512-71q2IKUS1PAZ95t9lgMsLYoAtYuOrTol1jQLGkuI/8wOLtBvneFdpVqSvT0X4LxD6IDALhwNSEnRPVY/DNUyAg==",
       "dev": true
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
+      "dev": true
+    },
     "catharsis": {
       "version": "0.8.9",
       "resolved": "https://registry.npmjs.org/catharsis/-/catharsis-0.8.9.tgz",
@@ -428,16 +521,14 @@
       }
     },
     "chalk": {
-      "version": "1.1.3",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
-      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.3.2.tgz",
+      "integrity": "sha512-ZM4j2/ld/YZDc3Ma8PgN7gyAk+kHMMMyzLNryCPGhWrsfAuDVeuid5bpRFTDgMH9JBK2lA4dyyAkkZYF/WcqDQ==",
       "dev": true,
       "requires": {
-        "ansi-styles": "2.2.1",
+        "ansi-styles": "3.2.1",
         "escape-string-regexp": "1.0.5",
-        "has-ansi": "2.0.0",
-        "strip-ansi": "3.0.1",
-        "supports-color": "2.0.0"
+        "supports-color": "5.3.0"
       }
     },
     "check-error": {
@@ -447,9 +538,9 @@
       "dev": true
     },
     "ci-info": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.1.2.tgz",
-      "integrity": "sha512-uTGIPNx/nSpBdsF6xnseRXLLtfr9VLqkz8ZqHXr3Y7b6SftyRxBGjwMtJj1OhNbmlc1wZzLNAlAcvyIiE8a6ZA==",
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/ci-info/-/ci-info-1.1.3.tgz",
+      "integrity": "sha512-SK/846h/Rcy8q9Z9CAwGBLfCJ6EkjJWdpelWDufQpqVDYq2Wnnv8zlSO6AMQap02jvhVruKKpEtQOufo3pFhLg==",
       "dev": true
     },
     "cli-cursor": {
@@ -527,88 +618,6 @@
         "argv": "0.0.2",
         "request": "2.81.0",
         "urlgrey": "0.4.4"
-      },
-      "dependencies": {
-        "caseless": {
-          "version": "0.12.0",
-          "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
-          "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw=",
-          "dev": true
-        },
-        "har-validator": {
-          "version": "4.2.1",
-          "resolved": "https://registry.npmjs.org/har-validator/-/har-validator-4.2.1.tgz",
-          "integrity": "sha1-M0gdDxu/9gDdID11gSpqX7oALio=",
-          "dev": true,
-          "requires": {
-            "ajv": "4.11.8",
-            "har-schema": "1.0.5"
-          }
-        },
-        "qs": {
-          "version": "6.4.0",
-          "resolved": "https://registry.npmjs.org/qs/-/qs-6.4.0.tgz",
-          "integrity": "sha1-E+JtKK1rD/qpExLNO/cI7TUecjM=",
-          "dev": true
-        },
-        "request": {
-          "version": "2.81.0",
-          "resolved": "https://registry.npmjs.org/request/-/request-2.81.0.tgz",
-          "integrity": "sha1-xpKJRqDgbF+Nb4qTM0af/aRimKA=",
-          "dev": true,
-          "requires": {
-            "aws-sign2": "0.6.0",
-            "aws4": "1.6.0",
-            "caseless": "0.12.0",
-            "combined-stream": "1.0.5",
-            "extend": "3.0.1",
-            "forever-agent": "0.6.1",
-            "form-data": "2.1.4",
-            "har-validator": "4.2.1",
-            "hawk": "3.1.3",
-            "http-signature": "1.1.1",
-            "is-typedarray": "1.0.0",
-            "isstream": "0.1.2",
-            "json-stringify-safe": "5.0.1",
-            "mime-types": "2.1.17",
-            "oauth-sign": "0.8.2",
-            "performance-now": "0.2.0",
-            "qs": "6.4.0",
-            "safe-buffer": "5.1.1",
-            "stringstream": "0.0.5",
-            "tough-cookie": "2.3.3",
-            "tunnel-agent": "0.6.0",
-            "uuid": "3.2.1"
-          },
-          "dependencies": {
-            "form-data": {
-              "version": "2.1.4",
-              "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.1.4.tgz",
-              "integrity": "sha1-M8GDrPGTJ27KqYFDpp6Uv+4XUNE=",
-              "dev": true,
-              "requires": {
-                "asynckit": "0.4.0",
-                "combined-stream": "1.0.5",
-                "mime-types": "2.1.17"
-              }
-            }
-          }
-        },
-        "tunnel-agent": {
-          "version": "0.6.0",
-          "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
-          "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
-          "dev": true,
-          "requires": {
-            "safe-buffer": "5.1.1"
-          }
-        },
-        "uuid": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
-          "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA==",
-          "dev": true
-        }
       }
     },
     "collect-all": {
@@ -637,9 +646,9 @@
       "dev": true
     },
     "combined-stream": {
-      "version": "1.0.5",
-      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz",
-      "integrity": "sha1-k4NwpXtKUd6ix3wV1cX9+JUWQAk=",
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.6.tgz",
+      "integrity": "sha1-cj599ugBrFYTETp+RFqbactjKBg=",
       "requires": {
         "delayed-stream": "1.0.0"
       }
@@ -678,14 +687,14 @@
       "requires": {
         "ansi-escape-sequences": "4.0.0",
         "array-back": "2.0.0",
-        "table-layout": "0.4.2",
+        "table-layout": "0.4.3",
         "typical": "2.6.1"
       }
     },
     "commander": {
-      "version": "2.14.0",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.14.0.tgz",
-      "integrity": "sha512-okPpdvdJr6mUGi2XzupC+irQxzwGLVaBzacFC14hjLv8NColXEsxsU+QaeuSSXpQUak5g2K0vQ7WjA1e8svczg==",
+      "version": "2.15.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.15.0.tgz",
+      "integrity": "sha512-7B1ilBwtYSbetCgTY1NJFg+gVpestg0fdA1MhC1Vs4ssyfSXnCAjFr+QcQM9/RedXC0EaUx1sG8Smgw2VfgKEg==",
       "dev": true
     },
     "common-sequence": {
@@ -729,7 +738,7 @@
       "dev": true,
       "requires": {
         "is-directory": "0.3.1",
-        "js-yaml": "3.10.0",
+        "js-yaml": "3.11.0",
         "parse-json": "4.0.0",
         "require-from-string": "2.0.1"
       }
@@ -740,7 +749,7 @@
       "integrity": "sha1-6L0O/uWPz/b4+UUQoKVUu/ojVEk=",
       "dev": true,
       "requires": {
-        "lru-cache": "4.1.1",
+        "lru-cache": "4.1.2",
         "shebang-command": "1.2.0",
         "which": "1.3.0"
       }
@@ -778,9 +787,9 @@
       "dev": true
     },
     "debug": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
+      "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
       "dev": true,
       "requires": {
         "ms": "2.0.0"
@@ -863,12 +872,38 @@
       "requires": {
         "readable-stream": "1.1.14",
         "streamsearch": "0.1.2"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true
+        },
+        "readable-stream": {
+          "version": "1.1.14",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
+          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
+          "dev": true,
+          "requires": {
+            "core-util-is": "1.0.2",
+            "inherits": "2.0.3",
+            "isarray": "0.0.1",
+            "string_decoder": "0.10.31"
+          }
+        },
+        "string_decoder": {
+          "version": "0.10.31",
+          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
+          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ=",
+          "dev": true
+        }
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-          "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0=",
-          "dev": true
-        },
-        "supports-color": {
-          "version": "5.3.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.3.0.tgz",
-          "integrity": "sha512-0aP01LLIskjKs3lq52EC0aGBAJhLq7B2Rd8HC/DR/PtNNpcLilNmHC12O+hu0usQpo7wtHNRqtrhBwtDb0+dNg==",
-          "dev": true,
-          "requires": {
-            "has-flag": "3.0.0"
-          }
-        }
       }
     },
     "ts-node": {
@@ -5060,51 +6023,22 @@
       "dev": true,
       "requires": {
         "arrify": "1.0.1",
-        "chalk": "2.3.0",
-        "diff": "3.3.1",
-        "make-error": "1.3.3",
+        "chalk": "2.3.2",
+        "diff": "3.5.0",
+        "make-error": "1.3.4",
         "minimist": "1.2.0",
         "mkdirp": "0.5.1",
         "source-map-support": "0.5.3",
         "tsconfig": "7.0.0",
-        "v8flags": "3.0.1",
+        "v8flags": "3.0.2",
         "yn": "2.0.0"
       },
       "dependencies": {
-        "ansi-styles": {
-          "version": "3.2.0",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
-          "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
-          "dev": true,
-          "requires": {
-            "color-convert": "1.9.1"
-          }
-        },
-        "chalk": {
-          "version": "2.3.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.3.0.tgz",
-          "integrity": "sha512-Az5zJR2CBujap2rqXGaJKaPHyJ0IrUimvYNX+ncCy8PJP4ltOGTrHUIo097ZaL2zMeKYpiCdqDvS6zdrTFok3Q==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "3.2.0",
-            "escape-string-regexp": "1.0.5",
-            "supports-color": "4.5.0"
-          }
-        },
         "minimist": {
           "version": "1.2.0",
           "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
           "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=",
           "dev": true
-        },
-        "supports-color": {
-          "version": "4.5.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.5.0.tgz",
-          "integrity": "sha1-vnoN5ITexcXN34s9WRJQRJEvY1s=",
-          "dev": true,
-          "requires": {
-            "has-flag": "2.0.0"
-          }
         }
       }
     },
@@ -5134,74 +6068,38 @@
       "requires": {
         "babel-code-frame": "6.26.0",
         "builtin-modules": "1.1.1",
-        "chalk": "2.3.0",
-        "commander": "2.14.0",
-        "diff": "3.3.1",
+        "chalk": "2.3.2",
+        "commander": "2.15.0",
+        "diff": "3.5.0",
         "glob": "7.1.2",
-        "js-yaml": "3.10.0",
+        "js-yaml": "3.11.0",
         "minimatch": "3.0.4",
         "resolve": "1.5.0",
         "semver": "5.5.0",
         "tslib": "1.9.0",
-        "tsutils": "2.21.0"
-      },
-      "dependencies": {
-        "ansi-styles": {
-          "version": "3.2.0",
-          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
-          "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
-          "dev": true,
-          "requires": {
-            "color-convert": "1.9.1"
-          }
-        },
-        "chalk": {
-          "version": "2.3.0",
-          "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.3.0.tgz",
-          "integrity": "sha512-Az5zJR2CBujap2rqXGaJKaPHyJ0IrUimvYNX+ncCy8PJP4ltOGTrHUIo097ZaL2zMeKYpiCdqDvS6zdrTFok3Q==",
-          "dev": true,
-          "requires": {
-            "ansi-styles": "3.2.0",
-            "escape-string-regexp": "1.0.5",
-            "supports-color": "4.5.0"
-          }
-        },
-        "semver": {
-          "version": "5.5.0",
-          "resolved": "https://registry.npmjs.org/semver/-/semver-5.5.0.tgz",
-          "integrity": "sha512-4SJ3dm0WAwWy/NVeioZh5AntkdJoWKxHxcmyP622fOkgHa4z3R0TdBJICINyaSDE6uNwVc8gZr+ZinwZAH4xIA==",
-          "dev": true
-        },
-        "supports-color": {
-          "version": "4.5.0",
-          "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.5.0.tgz",
-          "integrity": "sha1-vnoN5ITexcXN34s9WRJQRJEvY1s=",
-          "dev": true,
-          "requires": {
-            "has-flag": "2.0.0"
-          }
-        }
+        "tsutils": "2.22.2"
       }
     },
     "tslint-config-airbnb": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/tslint-config-airbnb/-/tslint-config-airbnb-5.5.0.tgz",
-      "integrity": "sha1-aGsZVgZF7rRKZmLclKY86TU9WJ4=",
+      "version": "5.7.0",
+      "resolved": "https://registry.npmjs.org/tslint-config-airbnb/-/tslint-config-airbnb-5.7.0.tgz",
+      "integrity": "sha1-Cf8EsN1Zl2X0S0QlAERY0I/LLEA=",
       "dev": true,
       "requires": {
-        "tslint-consistent-codestyle": "1.11.1",
+        "tslint-consistent-codestyle": "1.12.0",
         "tslint-eslint-rules": "4.1.1",
-        "tslint-microsoft-contrib": "5.0.2"
+        "tslint-microsoft-contrib": "5.0.3"
       }
     },
     "tslint-consistent-codestyle": {
-      "version": "1.11.1",
-      "resolved": "https://registry.npmjs.org/tslint-consistent-codestyle/-/tslint-consistent-codestyle-1.11.1.tgz",
-      "integrity": "sha512-wLu+Ct8x4mBmVkuhEiNAnUBkxchMV2Le0ikBsST5HnKbGlm3K4RSpXCBSI1VtJDk748W2I5hDzgsInawLdnxwQ==",
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/tslint-consistent-codestyle/-/tslint-consistent-codestyle-1.12.0.tgz",
+      "integrity": "sha512-/nubJhAjGx+QiZkuiMUWEHqNmrCtuc4Hw29fel/hFDMeNBkTBPuiBpi0wUtHJ26aKPUX44PCp8iduc/p3QxESw==",
       "dev": true,
       "requires": {
+        "@fimbul/bifrost": "0.4.0",
         "tslib": "1.9.0",
-        "tsutils": "2.21.0"
+        "tsutils": "2.22.2"
       }
     },
     "tslint-eslint-rules": {
@@ -5215,6 +6113,28 @@
         "tsutils": "1.9.1"
       },
       "dependencies": {
+        "doctrine": {
+          "version": "0.7.2",
+          "resolved": "https://registry.npmjs.org/doctrine/-/doctrine-0.7.2.tgz",
+          "integrity": "sha1-fLhgNZujvpDgQLJrcpzkv6ZUxSM=",
+          "dev": true,
+          "requires": {
+            "esutils": "1.1.6",
+            "isarray": "0.0.1"
+          }
+        },
+        "esutils": {
+          "version": "1.1.6",
+          "resolved": "https://registry.npmjs.org/esutils/-/esutils-1.1.6.tgz",
+          "integrity": "sha1-wBzKqa5LiXxtDD4hCuUvPHqEQ3U=",
+          "dev": true
+        },
+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
+          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8=",
+          "dev": true
+        },
         "tsutils": {
           "version": "1.9.1",
           "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-1.9.1.tgz",
@@ -5224,23 +6144,32 @@
       }
     },
     "tslint-microsoft-contrib": {
-      "version": "5.0.2",
-      "resolved": "https://registry.npmjs.org/tslint-microsoft-contrib/-/tslint-microsoft-contrib-5.0.2.tgz",
-      "integrity": "sha1-7MKnl/d3oS8AZpRM7AyBqefFnuk=",
+      "version": "5.0.3",
+      "resolved": "https://registry.npmjs.org/tslint-microsoft-contrib/-/tslint-microsoft-contrib-5.0.3.tgz",
+      "integrity": "sha512-5AnfTGlfpUzpRHLmoojPBKFTTmbjnwgdaTHMdllausa4GBPya5u36i9ddrTX4PhetGZvd4JUYIpAmgHqVnsctg==",
       "dev": true,
       "requires": {
-        "tsutils": "2.21.0"
+        "tsutils": "2.22.2"
       }
     },
     "tsutils": {
-      "version": "2.21.0",
-      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.21.0.tgz",
-      "integrity": "sha512-zlOHTYtTwvTiKxUyAU8wiKzPpAgwZrGjb7AY18VUlxuCgBiTMVorIl5HjrCT8V64Hm34RI1BZITJMVQpBLMxVg==",
+      "version": "2.22.2",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.22.2.tgz",
+      "integrity": "sha512-u06FUSulCJ+Y8a2ftuqZN6kIGqdP2yJjUPEngXqmdPND4UQfb04igcotH+dw+IFr417yP6muCLE8/5/Qlfnx0w==",
       "dev": true,
       "requires": {
         "tslib": "1.9.0"
       }
     },
+    "tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha1-J6XeoGs2sEoKmWZ3SykIaPD8QP0=",
+      "dev": true,
+      "requires": {
+        "safe-buffer": "5.1.1"
+      }
+    },
     "tweetnacl": {
       "version": "0.14.5",
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
@@ -5255,9 +6184,9 @@
       "dev": true
     },
     "typescript": {
-      "version": "2.7.1",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.7.1.tgz",
-      "integrity": "sha512-bqB1yS6o9TNA9ZC/MJxM0FZzPnZdtHj0xWK/IZ5khzVqdpGul/R/EIiHRgFXlwTD7PSIaYVnGKq1QgMCu2mnqw==",
+      "version": "2.7.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.7.2.tgz",
+      "integrity": "sha512-p5TCYZDAO0m4G344hD+wx/LATebLWZNkkh2asWUFqSsD2OrDNhbAHuSjobrmsUmdzjJjEeZVU9g1h3O6vpstnw==",
       "dev": true
     },
     "typical": {
@@ -5352,10 +6281,16 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
+    "uuid": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.2.1.tgz",
+      "integrity": "sha512-jZnMwlb9Iku/O3smGWvZhauCf6cvvpKi4BKRiliS3cxnI+Gz9j5MEpTz2UFuXiKPJocb7gnsLHwiS05ige5BEA==",
+      "dev": true
+    },
     "v8flags": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.0.1.tgz",
-      "integrity": "sha1-3Oj8N5wX2fLJ6e142JzgAFKxt2s=",
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/v8flags/-/v8flags-3.0.2.tgz",
+      "integrity": "sha512-6sgSKoFw1UpUPd3cFdF7QGnrH6tDeBgW1F3v9gy8gLY0mlbiBXq8soy8aQpY6xeeCjH5K+JvC62Acp7gtl7wWA==",
       "dev": true,
       "requires": {
         "homedir-polyfill": "1.0.1"

From 5feaa6b900542daf6bb7b19f169c03e5f30e2a29 Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 19:31:08 -0700
Subject: [PATCH 02/24] add unit tests for WebClient without a token

---
 src/WebClient.spec.js | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index fc2e56860..7f42efba8 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -23,6 +23,11 @@ describe('WebClient', function () {
       assert.equal(client.token, token);
       assert.equal(client.slackApiUrl, 'https://slack.com/api/')
     });
+
+    it('should build a client without a token', function () {
+      const client = new WebClient();
+      assert.instanceOf(client, WebClient);
+    });
   });
 
   describe('has an option to change the log output severity', function () {
@@ -311,6 +316,21 @@ describe('WebClient', function () {
     });
   });
 
+  describe('apiCall() - without a token', function () {
+    const client = new WebClient(undefined, { retryConfig: fastRetriesForTest });
+
+    const scope = nock('https://slack.com')
+      // NOTE: this could create false negatives if the serialization order changes (it shouldn't matter)
+      .post(/api/, 'foo=stringval')
+      .reply(200, { ok: true });
+
+    const r = client.apiCall('method', { foo: 'stringval' });
+    assert(isPromise(r));
+    return r.then(result => {
+      scope.done();
+    });
+  });
+
   describe('named method aliases (facets)', function () {
     beforeEach(function () {
       this.client = new WebClient(token, { retryConfig: fastRetriesForTest });

From e6580bb59164264664f740869a3eb17534764a3e Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 20:45:14 -0700
Subject: [PATCH 03/24] adds typings-tester, and failing test for WebClient
 without token

---
 package-lock.json                             |  9 +++++++++
 package.json                                  |  6 ++++--
 test/typescript/sources/webclient-no-token.ts | 11 +++++++++++
 test/typescript/test.ts                       |  9 +++++++++
 test/typescript/tsconfig-strict.json          | 13 +++++++++++++
 5 files changed, 46 insertions(+), 2 deletions(-)
 create mode 100644 test/typescript/sources/webclient-no-token.ts
 create mode 100644 test/typescript/test.ts
 create mode 100644 test/typescript/tsconfig-strict.json

diff --git a/package-lock.json b/package-lock.json
index 1aaa5c4f7..ee4c94e0b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6195,6 +6195,15 @@
       "integrity": "sha1-XAgOXWYcu+OCWdLnCjxyU+hziB0=",
       "dev": true
     },
+    "typings-tester": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/typings-tester/-/typings-tester-0.3.1.tgz",
+      "integrity": "sha512-KvsNMCKtPK87zn6xAVM+EAYBKt8UqfaajdtZv6GylHtmdfhjC4vRXXqfxO46lFeOgm7dfc8carJDjdd0wunNBw==",
+      "dev": true,
+      "requires": {
+        "commander": "2.15.0"
+      }
+    },
     "uglify-js": {
       "version": "2.8.29",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
diff --git a/package.json b/package.json
index 4dde80cdc..5f922f70b 100644
--- a/package.json
+++ b/package.json
@@ -30,8 +30,9 @@
     "precommit": "lint-staged",
     "prepush": "npm run build",
     "lint": "tslint --project .",
-    "test": "npm run test:spec",
+    "test": "npm run test:spec && npm run test:integration",
     "test:spec": "nyc mocha --opts src/mocha.opts src/*.spec.js src/**/*.spec.js",
+    "test:integration": "nyc mocha --opts test/mocha.opts test/typescript/test.ts",
     "coverage": "codecov",
     "build": "npm run build:clean && tsc",
     "build:clean": "shx rm -rf ./dist ./coverage ./.nyc_output",
@@ -90,6 +91,7 @@
     "ts-node": "^4.1.0",
     "tslint": "^5.9.1",
     "tslint-config-airbnb": "^5.5.0",
-    "typescript": "^2.7.1"
+    "typescript": "^2.7.1",
+    "typings-tester": "^0.3.1"
   }
 }
diff --git a/test/typescript/sources/webclient-no-token.ts b/test/typescript/sources/webclient-no-token.ts
new file mode 100644
index 000000000..0ec273911
--- /dev/null
+++ b/test/typescript/sources/webclient-no-token.ts
@@ -0,0 +1,11 @@
+
+import { WebClient } from '../../../dist';
+
+const web = new WebClient();
+
+web.oauth.access({
+  client_id: 'CLIENT_ID',
+  client_secret: 'CLIENT_SECRET',
+  code: 'CODE',
+  redirect_uri: 'REDIRECT_URI',
+});
diff --git a/test/typescript/test.ts b/test/typescript/test.ts
new file mode 100644
index 000000000..8f2baf4c2
--- /dev/null
+++ b/test/typescript/test.ts
@@ -0,0 +1,9 @@
+import 'mocha';
+import { check, checkDirectory } from 'typings-tester';
+
+describe('typescript typings tests', () => {
+  it('should allow WebClient to work without a token', () => {
+    check([`${__dirname}/sources/webclient-no-token.ts`], `${__dirname}/tsconfig-strict.json`);
+  });
+});
+
diff --git a/test/typescript/tsconfig-strict.json b/test/typescript/tsconfig-strict.json
new file mode 100644
index 000000000..000aa5b96
--- /dev/null
+++ b/test/typescript/tsconfig-strict.json
@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "target": "es2017",
+    "module": "commonjs",
+    "sourceMap": true,
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "moduleResolution": "node"
+  }
+}

From 70b2d74ae98497e542660a764f74ac94a4551a31 Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 20:46:26 -0700
Subject: [PATCH 04/24] lintstaged ignores test typescript

---
 .lintstagedrc.json | 5 ++++-
 package.json       | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/.lintstagedrc.json b/.lintstagedrc.json
index 7fb40aa7b..933d5ad87 100644
--- a/.lintstagedrc.json
+++ b/.lintstagedrc.json
@@ -1,3 +1,6 @@
 {
-  "*.ts": ["tslint --project . --fix", "git add"]
+  "linters": {
+    "*.ts": ["tslint --project . --fix", "git add"]
+  },
+  "ignore": ["test/**/*.ts"]
 }
diff --git a/package.json b/package.json
index 5f922f70b..37ac18c3c 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "lint": "tslint --project .",
     "test": "npm run test:spec && npm run test:integration",
     "test:spec": "nyc mocha --opts src/mocha.opts src/*.spec.js src/**/*.spec.js",
-    "test:integration": "nyc mocha --opts test/mocha.opts test/typescript/test.ts",
+    "test:integration": "npm run build && nyc mocha --opts test/mocha.opts test/typescript/test.ts",
     "coverage": "codecov",
     "build": "npm run build:clean && tsc",
     "build:clean": "shx rm -rf ./dist ./coverage ./.nyc_output",

From 99db7155e2f6b93b6bc2a7fa5ab4e2960f1395bc Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 20:49:21 -0700
Subject: [PATCH 05/24] allow WebClient token to be undefined, fixes #482

---
 src/WebClient.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/WebClient.ts b/src/WebClient.ts
index d27acc4e6..b21f23848 100644
--- a/src/WebClient.ts
+++ b/src/WebClient.ts
@@ -26,7 +26,7 @@ export class WebClient extends EventEmitter {
   /**
    * Authentication and authorization token for accessing Slack Web API (usually begins with `xoxp`, `xoxb`, or `xoxa`)
    */
-  public readonly token: string;
+  public readonly token?: string;
 
   /**
    * The base URL for reaching Slack's Web API. Consider changing this value for testing purposes.
@@ -73,7 +73,7 @@ export class WebClient extends EventEmitter {
   /**
    * @param token - An API token to authenticate/authorize with Slack (usually start with `xoxp`, `xoxb`, or `xoxa`)
    */
-  constructor(token: string, {
+  constructor(token?: string, {
     slackApiUrl = 'https://slack.com/api/',
     logger = undefined,
     logLevel = LogLevel.INFO,

From 93d835038adb2267cb518634e30806cba29ed387 Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 20:55:46 -0700
Subject: [PATCH 06/24] allow integration test cases to take up to 4s before
 timing out

---
 test/mocha.opts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/test/mocha.opts b/test/mocha.opts
index 1e41a38af..cd6c16f33 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1,3 +1,4 @@
 --require ts-node/register
 --require source-map-support/register
 --recursive
+--timeout 4000

From 73dea9086623c5f5e41c226c5d2de5dd92c9ad66 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Wed, 14 Mar 2018 10:32:17 +0100
Subject: [PATCH 07/24] fix file upload - consider metadata options by creating
 form data, related to #307

---
 .vscode/settings.json | 11 +++---
 package-lock.json     |  2 +-
 src/WebClient.spec.js | 90 ++++++++++++++++++++++++-------------------
 src/WebClient.ts      | 28 +++++++-------
 4 files changed, 72 insertions(+), 59 deletions(-)

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 187764097..1c85fa9ac 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,6 +1,7 @@
 {
-  "typescript.tsdk": "./node_modules/typescript/lib",
-  "editor.rulers": [
-    120
-  ]
-}
+    "typescript.tsdk": "./node_modules/typescript/lib",
+    "editor.rulers": [
+        120
+    ],
+    "editor.tabSize": 2,
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index d2ddb0287..9ef1ad4ea 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@slack/client",
-  "version": "4.0.0-beta.1",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index fc2e56860..e78cceca2 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -64,12 +64,12 @@ describe('WebClient', function () {
     });
   });
 
-  describe('apiCall()', function() {
+  describe('apiCall()', function () {
     beforeEach(function () {
       this.client = new WebClient(token, { retryConfig: fastRetriesForTest });
     });
 
-    describe('when making a successful call', function() {
+    describe('when making a successful call', function () {
       beforeEach(function () {
         this.scope = nock('https://slack.com')
           .post(/api/)
@@ -149,9 +149,9 @@ describe('WebClient', function () {
           hum: false,
         },
       })
-      .then(() => {
-        scope.done();
-      });
+        .then(() => {
+          scope.done();
+        });
     });
 
     it.skip('should remove undefined or null values from API arguments');
@@ -201,18 +201,28 @@ describe('WebClient', function () {
 
         // intentially vague about the method name
         return this.client.apiCall('upload', {
-            file: imageBuffer,
-            filename: 'train.png',
-          })
+          file: imageBuffer,
+          filename: 'train.png',
+        })
+          .then((parts) => {
+            assert.lengthOf(parts.files, 1);
+            const file = parts.files[0];
+            // options were not provided to the form builder
+            assert.include(file, { fieldname: 'file' });
+          });
+      });
+
+      it('should properly serialize when the file is an object with value as a Buffer and options containing filename', function () {
+        const imageBuffer = fs.readFileSync(path.resolve('test', 'fixtures', 'train.jpg'));
+
+        // intentially vague about the method name
+        return this.client.apiCall('upload', {
+          file: { value: imageBuffer, options: { filename: 'train.png' } },
+          filename: 'train.png',
+        })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
-            // TODO: understand why this assertion is failing. already employed the buffer metadata workaround, should
-            // look into the details about whether that workaround is still required, or why else the `source.on` is not
-            // defined error would occur, or if Slack just doesn't need a filename for the part
-            // assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
-            // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
-            // this was happening in the old implementation.
             assert.include(file, { fieldname: 'file' });
           });
       });
@@ -225,8 +235,8 @@ describe('WebClient', function () {
 
         // intentially vague about the method name
         return this.client.apiCall('upload', {
-            file: imageBuffer,
-          })
+          file: imageBuffer,
+        })
           .then(() => {
             const output = this.capture.getCapturedText();
             assert.isNotEmpty(output);
@@ -241,8 +251,8 @@ describe('WebClient', function () {
         const imageStream = fs.createReadStream(path.resolve('test', 'fixtures', 'train.jpg'));
 
         return this.client.apiCall('upload', {
-            file: imageStream,
-          })
+          file: imageStream,
+        })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
@@ -265,20 +275,20 @@ describe('WebClient', function () {
     describe('metadata in the user agent', function () {
       it('should set the user agent to contain package metadata', function () {
         const scope = nock('https://slack.com', {
-            reqheaders: {
-              'User-Agent': (value) => {
-                const metadata = parseUserAgentIntoMetadata(value)
-                // NOTE: this assert isn't that strong and doesn't say anything about the values. at this time, there
-                // isn't a good way to test this without dupicating the logic of the code under test.
-                assert.containsAllKeys(metadata, ['node', '@slack:client']);
-                // NOTE: there's an assumption that if there's any keys besides these left at all, its the platform part
-                delete metadata.node;
-                delete metadata['@slack:client'];
-                assert.isNotEmpty(metadata);
-                return true;
-              },
+          reqheaders: {
+            'User-Agent': (value) => {
+              const metadata = parseUserAgentIntoMetadata(value)
+              // NOTE: this assert isn't that strong and doesn't say anything about the values. at this time, there
+              // isn't a good way to test this without dupicating the logic of the code under test.
+              assert.containsAllKeys(metadata, ['node', '@slack:client']);
+              // NOTE: there's an assumption that if there's any keys besides these left at all, its the platform part
+              delete metadata.node;
+              delete metadata['@slack:client'];
+              assert.isNotEmpty(metadata);
+              return true;
             },
-          })
+          },
+        })
           .post(/api/)
           .reply(200, { ok: true });
         return this.client.apiCall('method')
@@ -291,14 +301,14 @@ describe('WebClient', function () {
         const [name, version] = ['appmedataname', 'appmetadataversion'];
         addAppMetadata({ name, version });
         const scope = nock('https://slack.com', {
-            reqheaders: {
-              'User-Agent': (value) => {
-                const metadata = parseUserAgentIntoMetadata(value)
-                assert.propertyVal(metadata, name, version);
-                return true;
-              },
+          reqheaders: {
+            'User-Agent': (value) => {
+              const metadata = parseUserAgentIntoMetadata(value)
+              assert.propertyVal(metadata, name, version);
+              return true;
             },
-          })
+          },
+        })
           .post(/api/)
           .reply(200, { ok: true });
         // NOTE: appMetaData is only evalued on client construction, so we cannot use the client already created
@@ -331,7 +341,7 @@ describe('WebClient', function () {
     });
   })
 
-  describe('has option to change slackApiUrl', function() {
+  describe('has option to change slackApiUrl', function () {
     it('should send requests to an alternative URL', function () {
       const alternativeUrl = 'http://12.34.56.78/api/';
       const scope = nock(alternativeUrl)
@@ -344,7 +354,7 @@ describe('WebClient', function () {
 
   describe('has an option to set a custom HTTP agent', function () {
     // not confident how to test this. one idea is to use sinon to intercept method calls on the agent.
-    it.skip('should send a request using the custom agent', function() {
+    it.skip('should send a request using the custom agent', function () {
       const agent = new Agent();
       const client = new WebClient(token, { agent });
       return client.apiCall('method');
diff --git a/src/WebClient.ts b/src/WebClient.ts
index d27acc4e6..40d9ab74f 100644
--- a/src/WebClient.ts
+++ b/src/WebClient.ts
@@ -524,18 +524,16 @@ export class WebClient extends EventEmitter {
       //                      'fail. add the `filename` option to fix.');
       //   }
 
-        // Buffers are sometimes not handled well by the underlying `form-data` package. Adding extra metadata resolves
-        // that issue. See: https://github.com/slackapi/node-slack-sdk/issues/307#issuecomment-289231737
-        // @ts-ignore
-      //   options.file = {
-      //     // @ts-ignore
-      //     value: options.file,
-      //     options: {
-      //       // @ts-ignore
-      //       filename: options.filename,
-      //     },
-      //   };
-      // }
+      // Buffers are sometimes not handled well by the underlying `form-data` package. Adding extra metadata resolves
+      // that issue. See: https://github.com/slackapi/node-slack-sdk/issues/307#issuecomment-289231737
+      if (options['file'] && !options['file'].value) {
+        options['file'] = {
+          value: options['file'],
+          options: {
+            filename: options['filename'],
+          },
+        };
+      }
     }
 
     const flattened = objectEntries(options)
@@ -555,6 +553,10 @@ export class WebClient extends EventEmitter {
     // a body with binary data should be serialized as multipart/form-data
     if (containsBinaryData) {
       return flattened.reduce((form, [key, value]) => {
+        if (key === 'file' && value.value) {
+          form.append(key, value.value, value.options);
+          return form;
+        }
         form.append(key, value);
         return form;
       }, new FormData());
@@ -658,7 +660,7 @@ interface FormCanBeURLEncoded {
   [key: string]: string | number | boolean;
 }
 
-interface BodyCanBeFormMultipart extends Readable {}
+interface BodyCanBeFormMultipart extends Readable { }
 
 /**
  * Determines whether a request body object should be treated as FormData-encodable (Content-Type=multipart/form-data).

From 8e4d4ee5cb2fddeaea2bec92b1062a1ad289f213 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Wed, 14 Mar 2018 14:22:02 +0100
Subject: [PATCH 08/24] fix unregular build failure

---
 src/WebClient.spec.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index e78cceca2..4bb8cca4f 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -400,7 +400,7 @@ describe('WebClient', function () {
           // verify that any requests after maxRequestConcurrency were delayed by the responseDelay
           const queuedResponses = responses.slice(3);
           const minDiff = concurrentResponses[concurrentResponses.length - 1].diff + responseDelay;
-          queuedResponses.forEach(r => assert.isAbove(r.diff, minDiff));
+          queuedResponses.forEach(r => assert.isAtLeast(r.diff, minDiff));
         });
     });
 
@@ -413,13 +413,15 @@ describe('WebClient', function () {
           assert.lengthOf(responses, 2);
 
           // verify that maxRequestConcurrency requets were all sent concurrently
-          const concurrentResponses = responses.slice(0, 1); // the first 3 responses
+          const concurrentResponses = responses.slice(0, 1); // the first response
           concurrentResponses.forEach(r => assert.isBelow(r.diff, responseDelay));
 
           // verify that any requests after maxRequestConcurrency were delayed by the responseDelay
-          const queuedResponses = responses.slice(1);
+          const queuedResponses = responses.slice(1);// the second response
           const minDiff = concurrentResponses[concurrentResponses.length - 1].diff + responseDelay;
-          queuedResponses.forEach(r => assert.isAbove(r.diff, minDiff));
+          queuedResponses.forEach(r => {
+            assert.isAtLeast(r.diff, minDiff)
+          });
         });
     });
 

From 9d0801ca761cd9f9391f5df176ca6f9f5a08de9d Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Tue, 13 Mar 2018 21:15:32 -0700
Subject: [PATCH 09/24] remove nyc from integration tests, it broke codecov

---
 package.json | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package.json b/package.json
index 37ac18c3c..3bdae8b42 100644
--- a/package.json
+++ b/package.json
@@ -30,9 +30,9 @@
     "precommit": "lint-staged",
     "prepush": "npm run build",
     "lint": "tslint --project .",
-    "test": "npm run test:spec && npm run test:integration",
+    "test": "npm run build && npm run test:spec && npm run test:integration",
     "test:spec": "nyc mocha --opts src/mocha.opts src/*.spec.js src/**/*.spec.js",
-    "test:integration": "npm run build && nyc mocha --opts test/mocha.opts test/typescript/test.ts",
+    "test:integration": "mocha --opts test/mocha.opts test/typescript/test.ts",
     "coverage": "codecov",
     "build": "npm run build:clean && tsc",
     "build:clean": "shx rm -rf ./dist ./coverage ./.nyc_output",

From 5ce84bbc8956d3c5be49c7b6caab51975d8e2570 Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Wed, 14 Mar 2018 11:57:33 -0700
Subject: [PATCH 10/24] exports method argument types, fixes #483

---
 src/index.ts                                  |  2 ++
 .../sources/method-argument-types.ts          | 28 +++++++++++++++++++
 test/typescript/test.ts                       |  4 +++
 3 files changed, 34 insertions(+)
 create mode 100644 test/typescript/sources/method-argument-types.ts

diff --git a/src/index.ts b/src/index.ts
index 7e31d9b6d..7cfc5f582 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -32,6 +32,8 @@ export {
   WebAPIResultCallback,
 } from './WebClient';
 
+export * from './methods';
+
 export {
   RTMClient,
   RTMClientOptions,
diff --git a/test/typescript/sources/method-argument-types.ts b/test/typescript/sources/method-argument-types.ts
new file mode 100644
index 000000000..33a493c68
--- /dev/null
+++ b/test/typescript/sources/method-argument-types.ts
@@ -0,0 +1,28 @@
+import { WebClient, ChatPostMessageArguments } from '../../../dist';
+
+const web = new WebClient('TOKEN');
+
+// calling a method directly with arbitrary arguments should work
+web.chat.postMessage({
+  channel: 'CHANNEL',
+  text: 'TEXT',
+  key: 'VALUE',
+});
+
+// calling a method directly with underspecified arguments should not work
+// typings:expect-error
+web.chat.postMessage({
+  channel: 'CHANNEL',
+});
+
+// assigning an object with a specific type that includes arbitrary arguments should not work
+const message: ChatPostMessageArguments = {
+  text: 'TEXT',
+  channel: 'CHANNEL',
+  // typings:expect-error
+  key: 'VALUE',
+};
+
+// this is just here to avoid the following error:
+// 'message' is declared but its value is never read.
+console.log(message);
diff --git a/test/typescript/test.ts b/test/typescript/test.ts
index 8f2baf4c2..de174327c 100644
--- a/test/typescript/test.ts
+++ b/test/typescript/test.ts
@@ -5,5 +5,9 @@ describe('typescript typings tests', () => {
   it('should allow WebClient to work without a token', () => {
     check([`${__dirname}/sources/webclient-no-token.ts`], `${__dirname}/tsconfig-strict.json`);
   });
+
+  it('should export method argument types and enforce strictness in the right ways', () => {
+    check([`${__dirname}/sources/method-argument-types.ts`], `${__dirname}/tsconfig-strict.json`);
+  });
 });
 

From 7f8e5b726a701d699f125d2e9219ed35db4f7492 Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Wed, 14 Mar 2018 13:15:05 -0700
Subject: [PATCH 11/24] more tightly specifies OAuthAccessArguments and
 OAuthTokenArguments, fixes #481

---
 src/methods.ts | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/methods.ts b/src/methods.ts
index a3a37d4c2..9c3297e07 100644
--- a/src/methods.ts
+++ b/src/methods.ts
@@ -329,8 +329,19 @@ export type MPIMRepliesArguments = TokenOverridable & {};
   /*
    * `oauth.*`
    */
-export type OAuthAccessArguments = TokenOverridable & {};
-export type OAuthTokenArguments = TokenOverridable & {};
+export type OAuthAccessArguments = {
+  client_id: string;
+  client_secret: string;
+  code: string;
+  redirect_uri?: string;
+};
+export type OAuthTokenArguments = {
+  client_id: string;
+  client_secret: string;
+  code: string;
+  redirect_uri?: string;
+  single_channel?: boolean;
+};
 
   /*
    * `pins.*`

From 8e4da081488f198760921677b79fa26fcf17fbfc Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Wed, 14 Mar 2018 13:26:42 -0700
Subject: [PATCH 12/24] removes pjson and directly requires package.json, fixes
 #478

---
 package-lock.json | 5 -----
 package.json      | 1 -
 src/KeepAlive.ts  | 4 ++--
 src/RTMClient.ts  | 4 ++--
 src/WebClient.ts  | 4 ++--
 src/util.ts       | 4 ++--
 6 files changed, 8 insertions(+), 14 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index ee4c94e0b..3a64357f8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5320,11 +5320,6 @@
       "resolved": "https://registry.npmjs.org/pify/-/pify-3.0.0.tgz",
       "integrity": "sha1-5aSs0sEB/fPZpNB/DbxNtJ3SgXY="
     },
-    "pjson": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/pjson/-/pjson-1.0.9.tgz",
-      "integrity": "sha512-4hRJH3YzkUpOlShRzhyxAmThSNnAaIlWZCAb27hd0pVUAXNUAHAO7XZbsPPvsCYwBFEScTmCCL6DGE8NyZ8BdQ=="
-    },
     "prepend-http": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/prepend-http/-/prepend-http-2.0.0.tgz",
diff --git a/package.json b/package.json
index 3bdae8b42..60feb9faf 100644
--- a/package.json
+++ b/package.json
@@ -64,7 +64,6 @@
     "p-cancelable": "^0.3.0",
     "p-queue": "^2.3.0",
     "p-retry": "^1.0.0",
-    "pjson": "^1.0.9",
     "retry": "^0.10.1",
     "url-join": "^4.0.0",
     "ws": "^4.1.0"
diff --git a/src/KeepAlive.ts b/src/KeepAlive.ts
index b77cc8b15..6d7390818 100644
--- a/src/KeepAlive.ts
+++ b/src/KeepAlive.ts
@@ -1,8 +1,8 @@
 import { RTMClient, ErrorCode } from './';
 import EventEmitter = require('eventemitter3'); // tslint:disable-line:import-name no-require-imports
-import * as pjson from 'pjson';
 import { LogLevel, Logger, LoggingFunc, getLogger, loggerFromLoggingFunc } from './logger';
 import { errorWithCode } from './errors';
+const pkg = require('../package.json'); // tslint:disable-line:no-require-imports no-var-requires
 
 export interface KeepAliveOptions {
   logger?: LoggingFunc;
@@ -50,7 +50,7 @@ export class KeepAlive extends EventEmitter {
   /**
    * The name used to prefix all logging generated from this object
    */
-  private static loggerName = `${pjson.name}:KeepAlive`;
+  private static loggerName = `${pkg.name}:KeepAlive`;
 
   /**
    * This object's logger instance
diff --git a/src/RTMClient.ts b/src/RTMClient.ts
index def4faed3..088ab4a63 100644
--- a/src/RTMClient.ts
+++ b/src/RTMClient.ts
@@ -1,5 +1,4 @@
 import { Agent } from 'http';
-import * as pjson from 'pjson';
 import objectValues = require('object.values'); // tslint:disable-line:import-name no-require-imports
 import EventEmitter = require('eventemitter3'); // tslint:disable-line:import-name no-require-imports
 import WebSocket = require('ws'); // tslint:disable-line:import-name no-require-imports
@@ -13,6 +12,7 @@ import { WebClient, WebAPICallResult, WebAPICallError, ErrorCode, CodedError } f
 import * as methods from './methods'; // tslint:disable-line:import-name
 import { errorWithCode } from './errors';
 import { callbackify, TLSOptions } from './util';
+const pkg = require('../package.json'); // tslint:disable-line:no-require-imports no-var-requires
 
 /**
  * An RTMClient allows programs to communicate with the {@link https://api.slack.com/rtm|Slack Platform's RTM API}.
@@ -272,7 +272,7 @@ export class RTMClient extends EventEmitter {
   /**
    * The name used to prefix all logging generated from this object
    */
-  private static loggerName = `${pjson.name}:RTMClient`;
+  private static loggerName = `${pkg.name}:RTMClient`;
 
 
   /**
diff --git a/src/WebClient.ts b/src/WebClient.ts
index b21f23848..6b4fa4cad 100644
--- a/src/WebClient.ts
+++ b/src/WebClient.ts
@@ -1,6 +1,5 @@
 import { Readable } from 'stream';
 import objectEntries = require('object.entries'); // tslint:disable-line:no-require-imports
-import * as pjson from 'pjson';
 import urlJoin = require('url-join'); // tslint:disable-line:no-require-imports
 import isStream = require('is-stream'); // tslint:disable-line:no-require-imports
 import EventEmitter = require('eventemitter3'); // tslint:disable-line:import-name no-require-imports
@@ -15,6 +14,7 @@ import { CodedError, errorWithCode, ErrorCode } from './errors';
 import { LogLevel, Logger, LoggingFunc, getLogger, loggerFromLoggingFunc } from './logger';
 import retryPolicies, { RetryOptions } from './retry-policies';
 import Method, * as methods from './methods'; // tslint:disable-line:import-name
+const pkg = require('../package.json'); // tslint:disable-line:no-require-imports no-var-requires
 
 /**
  * A client for Slack's Web API
@@ -58,7 +58,7 @@ export class WebClient extends EventEmitter {
   /**
    * The name used to prefix all logging generated from this object
    */
-  private static loggerName = `${pjson.name}:WebClient`;
+  private static loggerName = `${pkg.name}:WebClient`;
 
   /**
    * This object's logger instance
diff --git a/src/util.ts b/src/util.ts
index 1ead7f65b..878ffcf8e 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -1,8 +1,8 @@
 import * as util from 'util';
 import * as os from 'os';
-import * as pjson from 'pjson';
 import { Agent } from 'http';
 import objectEntries = require('object.entries'); // tslint:disable-line:no-require-imports
+const pkg = require('../package.json'); // tslint:disable-line:no-require-imports no-var-requires
 
 /**
  * For when you need a function that does nothing
@@ -17,7 +17,7 @@ function replaceSlashes(s: string): string {
   return s.replace('/', ':');
 }
 
-const baseUserAgent = `${replaceSlashes(pjson.name)}/${pjson.version} ` +
+const baseUserAgent = `${replaceSlashes(pkg.name)}/${pkg.version} ` +
                       `node/${process.version.replace('v', '')} ` +
                       `${os.platform()}/${os.release()}`;
 

From 501b0aff8cd602c3d8189129663243d860557db6 Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Wed, 14 Mar 2018 13:51:58 -0700
Subject: [PATCH 13/24] update for boolean flag quirk

---
 src/methods.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/methods.ts b/src/methods.ts
index 9c3297e07..636ff8d21 100644
--- a/src/methods.ts
+++ b/src/methods.ts
@@ -340,7 +340,7 @@ export type OAuthTokenArguments = {
   client_secret: string;
   code: string;
   redirect_uri?: string;
-  single_channel?: boolean;
+  single_channel?: '0' | '1';
 };
 
   /*

From 8ce3b6176293c2b02ede7d1f6ff94fe18c50f46f Mon Sep 17 00:00:00 2001
From: Ankur Oberoi <aoberoi@gmail.com>
Date: Wed, 14 Mar 2018 16:34:32 -0700
Subject: [PATCH 14/24] v4.0.1

---
 docs/_posts/2018-03-14-v4.0.1.md            |  12 ++
 docs/_reference/WebClient.md                |  23 +--
 package-lock.json                           |  10 +-
 package.json                                |   2 +-
 support/jsdoc/@slack-client-dist-methods.js |   6 +
 support/jsdoc/@slack-client.js              | 206 +-------------------
 6 files changed, 40 insertions(+), 219 deletions(-)
 create mode 100644 docs/_posts/2018-03-14-v4.0.1.md

diff --git a/docs/_posts/2018-03-14-v4.0.1.md b/docs/_posts/2018-03-14-v4.0.1.md
new file mode 100644
index 000000000..b44be9b7c
--- /dev/null
+++ b/docs/_posts/2018-03-14-v4.0.1.md
@@ -0,0 +1,12 @@
+---
+layout: changelog
+---
+
+-  Fixes crash in projects where `"name"` or `"version"` were not defined in the `package.json` file (#478) - thanks @wilhelmklopp @clavin @aoberoi
+-  Fixes `IncomingWebhook.send()` to parse the response as text instead of JSON (#477) - thanks @aoberoi
+-  Allows `IncomingWebhook` to be initialized without defaults (#479) - thanks @aoberoi
+-  Allows `WebClient` to be initialized without a `token` in TypeScript (#482) - thanks @aoberoi
+-  Allows unspecificed arguments to be used with `WebClient` method aliases and `apiCall()` (#484) - thanks @clavin
+-  Exports method argument types as top level exports in the type declarations (#483) - thanks @aoberoi
+-  Fixes inaccurate property type for `as_user` in `ChatPostMessageArguments` (#475) - thanks @harveyr
+-  Improves the `OAuthAccessArguments` and `OAuthTokenArguments` types (#481) - thanks @aoberoi
diff --git a/docs/_reference/WebClient.md b/docs/_reference/WebClient.md
index bb44e3d47..895606048 100644
--- a/docs/_reference/WebClient.md
+++ b/docs/_reference/WebClient.md
@@ -8,8 +8,8 @@ A client for Slack's Web API
 This client provides an alias for each [Web API method](https://api.slack.com/methods). Each method is
 a convenience wrapper for calling the [WebClient#apiCall](WebClient#apiCall) method using the method name as the first parameter.
 
-**Kind**: static class of [<code>@slack/client</code>](#module_@slack/client)
-**Extends**: <code>EventEmitter</code>
+**Kind**: static class of [<code>@slack/client</code>](#module_@slack/client)  
+**Extends**: <code>EventEmitter</code>  
 **Properties**
 
 | Name | Type | Description |
@@ -17,6 +17,7 @@ a convenience wrapper for calling the [WebClient#apiCall](WebClient#apiCall) met
 | [token] | <code>string</code> | Authentication and authorization token for accessing Slack Web API (usually begins with `xoxp`, `xoxb`, or `xoxa`) |
 | [slackApiUrl] | <code>string</code> | The base URL for reaching Slack's Web API. Consider changing this value for testing purposes. |
 
+
 * [.WebClient](#module_@slack/client.WebClient) ⇐ <code>EventEmitter</code>
     * [.apiCall(method, options)](#module_@slack/client.WebClient+apiCall) ⇒ [<code>Promise.&lt;WebAPICallResult&gt;</code>](#module_@slack/client.WebAPICallResult)
     * [.apiCall(method, options, callback)](#module_@slack/client.WebClient+apiCall)
@@ -27,7 +28,7 @@ a convenience wrapper for calling the [WebClient#apiCall](WebClient#apiCall) met
 ### webClient.apiCall(method, options) ⇒ [<code>Promise.&lt;WebAPICallResult&gt;</code>](#module_@slack/client.WebAPICallResult)
 Generic method for calling a Web API method
 
-**Kind**: instance method of [<code>WebClient</code>](#module_@slack/client.WebClient)
+**Kind**: instance method of [<code>WebClient</code>](#module_@slack/client.WebClient)  
 
 | Param | Type | Description |
 | --- | --- | --- |
@@ -37,22 +38,22 @@ Generic method for calling a Web API method
 <a name="module_@slack/client.WebClient+apiCall"></a>
 
 ### webClient.apiCall(method, options, callback)
-**Kind**: instance method of [<code>WebClient</code>](#module_@slack/client.WebClient)
+**Kind**: instance method of [<code>WebClient</code>](#module_@slack/client.WebClient)  
 
 | Param | Type |
 | --- | --- |
-| method | <code>string</code> |
-| options | [<code>WebAPICallOptions</code>](#module_@slack/client.WebAPICallOptions) |
-| callback | [<code>WebAPIResultCallback</code>](#module_@slack/client.WebAPIResultCallback) |
+| method | <code>string</code> | 
+| options | [<code>WebAPICallOptions</code>](#module_@slack/client.WebAPICallOptions) | 
+| callback | [<code>WebAPIResultCallback</code>](#module_@slack/client.WebAPIResultCallback) | 
 
 <a name="module_@slack/client.WebClient+apiCall"></a>
 
 ### webClient.apiCall(method, options, callback)
-**Kind**: instance method of [<code>WebClient</code>](#module_@slack/client.WebClient)
+**Kind**: instance method of [<code>WebClient</code>](#module_@slack/client.WebClient)  
 
 | Param | Type |
 | --- | --- |
-| method | <code>string</code> |
-| options | [<code>WebAPICallOptions</code>](#module_@slack/client.WebAPICallOptions) |
-| callback | [<code>WebAPIResultCallback</code>](#module_@slack/client.WebAPIResultCallback) |
+| method | <code>string</code> | 
+| options | [<code>WebAPICallOptions</code>](#module_@slack/client.WebAPICallOptions) | 
+| callback | [<code>WebAPIResultCallback</code>](#module_@slack/client.WebAPIResultCallback) | 
 
diff --git a/package-lock.json b/package-lock.json
index 3a64357f8..beab36912 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@slack/client",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -2266,7 +2266,7 @@
       "integrity": "sha512-D6MUW4K/VzoJ4rJ01JFKxDrtY1v9wrgzCX5f2qj/lzH1m/lW6MhUZFKerVsnyjOhOsYzI9Kqqak+10l4LvLpMw==",
       "requires": {
         "prepend-http": "2.0.0",
-        "query-string": "5.1.0",
+        "query-string": "5.1.1",
         "sort-keys": "2.0.0"
       }
     },
@@ -5365,9 +5365,9 @@
       "dev": true
     },
     "query-string": {
-      "version": "5.1.0",
-      "resolved": "https://registry.npmjs.org/query-string/-/query-string-5.1.0.tgz",
-      "integrity": "sha512-F3DkxxlY0AqD/rwe4YAwjRE2HjOkKW7TxsuteyrS/Jbwrxw887PqYBL4sWUJ9D/V1hmFns0SCD6FDyvlwo9RCQ==",
+      "version": "5.1.1",
+      "resolved": "https://registry.npmjs.org/query-string/-/query-string-5.1.1.tgz",
+      "integrity": "sha512-gjWOsm2SoGlgLEdAGt7a6slVOk9mGiXmPFMqrEhLQ68rhQuBnpfs3+EmlvqKyxnCo9/PPlF+9MtY02S1aFg+Jw==",
       "requires": {
         "decode-uri-component": "0.2.0",
         "object-assign": "4.1.1",
diff --git a/package.json b/package.json
index 60feb9faf..acfa48109 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@slack/client",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "Slack Developer Kit - official clients for the Web API, RTM API, and Incoming Webhooks",
   "author": "Slack Technologies, Inc.",
   "license": "MIT",
diff --git a/support/jsdoc/@slack-client-dist-methods.js b/support/jsdoc/@slack-client-dist-methods.js
index 7f3cdcf2f..81a422971 100644
--- a/support/jsdoc/@slack-client-dist-methods.js
+++ b/support/jsdoc/@slack-client-dist-methods.js
@@ -2,6 +2,12 @@
  * @module @slack/client/dist/methods
  */
 
+/**
+ * @interface module:@slack/client/dist/methods.AuxiliaryArguments
+ */
+export class AuxiliaryArguments {
+}
+
 /**
  * @interface module:@slack/client/dist/methods.CursorPaginationEnabled
  * @property {number} [limit]
diff --git a/support/jsdoc/@slack-client.js b/support/jsdoc/@slack-client.js
index 7650a60a2..eded26636 100644
--- a/support/jsdoc/@slack-client.js
+++ b/support/jsdoc/@slack-client.js
@@ -1,4 +1,4 @@
-/** 
+/**
  * @module @slack/client
  */
 
@@ -133,12 +133,12 @@ export class RTMClient {
    * Generic method for sending an outgoing message of an arbitrary type. This method guards the higher-level methods
    * from concern of which state the client is in, because it places all messages into a queue. The tasks on the queue
    * will buffer until the client is in a state where they can be sent.
-   * 
+   *
    * If the awaitReply parameter is set to true, then the returned Promise is resolved with the platform's
    * acknowledgement response. Not all message types will result in an acknowledgement response, so use this carefully.
    * This promise may be rejected with an error containing code=RTMNoReplyReceivedError if the client disconnects or
    * reconnects before recieving the acknowledgement response.
-   * 
+   *
    * If the awaitReply parameter is set to false, then the returned Promise is resolved as soon as the message is sent
    * from the websocket.
    * @param {"undefined"} awaitReply whether to wait for an acknowledgement response from the platform before resolving the returned
@@ -337,210 +337,12 @@ export class WebAPIResultCallback {
 
 /**
  * A client for Slack's Web API
- * 
+ *
  * This client provides an alias for each {@link https://api.slack.com/methods|Web API method}. Each method is
  * a convenience wrapper for calling the {@link WebClient#apiCall} method using the method name as the first parameter.
  * @extends EventEmitter
  * @property {string} [token] Authentication and authorization token for accessing Slack Web API (usually begins with `xoxp`, `xoxb`, or `xoxa`)
  * @property {string} [slackApiUrl] The base URL for reaching Slack's Web API. Consider changing this value for testing purposes.
- * @property {module:@slack/client/dist/WebClient.__object} [api={
-    test: (this.apiCall.bind(this, 'api.test')) as Method<methods.APITestArguments>,
-  }] api method family
- * @property {module:@slack/client/dist/WebClient.__object} [apps={
-    permissions: {
-      info: (this.apiCall.bind(this, 'apps.permissions.info')) as Method<methods.AppsPermissionsInfoArguments>,
-      request: (this.apiCall.bind(this, 'apps.permissions.request')) as Method<methods.AppsPermissionsRequestArguments>,
-    },
-  }] apps method family
- * @property {module:@slack/client/dist/WebClient.__object} [auth={
-    revoke: (this.apiCall.bind(this, 'auth.revoke')) as Method<methods.AuthRevokeArguments>,
-    test: (this.apiCall.bind(this, 'auth.test')) as Method<methods.AuthTestArguments>,
-  }] auth method family
- * @property {module:@slack/client/dist/WebClient.__object} [bots={
-    info: (this.apiCall.bind(this, 'bots.info')) as Method<methods.BotsInfoArguments>,
-  }] bots method family
- * @property {module:@slack/client/dist/WebClient.__object} [channels={
-    archive: (this.apiCall.bind(this, 'channels.archive')) as Method<methods.ChannelsArchiveArguments>,
-    create: (this.apiCall.bind(this, 'channels.create')) as Method<methods.ChannelsCreateArguments>,
-    history: (this.apiCall.bind(this, 'channels.history')) as Method<methods.ChannelsHistoryArguments>,
-    info: (this.apiCall.bind(this, 'channels.info')) as Method<methods.ChannelsInfoArguments>,
-    invite: (this.apiCall.bind(this, 'channels.invite')) as Method<methods.ChannelsInviteArguments>,
-    join: (this.apiCall.bind(this, 'channels.join')) as Method<methods.ChannelsJoinArguments>,
-    kick: (this.apiCall.bind(this, 'channels.kick')) as Method<methods.ChannelsKickArguments>,
-    leave: (this.apiCall.bind(this, 'channels.leave')) as Method<methods.ChannelsLeaveArguments>,
-    list: (this.apiCall.bind(this, 'channels.list')) as Method<methods.ChannelsListArguments>,
-    mark: (this.apiCall.bind(this, 'channels.mark')) as Method<methods.ChannelsMarkArguments>,
-    rename: (this.apiCall.bind(this, 'channels.rename')) as Method<methods.ChannelsRenameArguments>,
-    replies: (this.apiCall.bind(this, 'channels.replies')) as Method<methods.ChannelsRepliesArguments>,
-    setPurpose: (this.apiCall.bind(this, 'channels.setPurpose')) as Method<methods.ChannelsSetPurposeArguments>,
-    setTopic: (this.apiCall.bind(this, 'channels.setTopic')) as Method<methods.ChannelsSetTopicArguments>,
-    unarchive: (this.apiCall.bind(this, 'channels.unarchive')) as Method<methods.ChannelsUnarchiveArguments>,
-  }] channels method family
- * @property {module:@slack/client/dist/WebClient.__object} [chat={
-    delete: (this.apiCall.bind(this, 'chat.delete')) as Method<methods.ChatDeleteArguments>,
-    getPermalink: (this.apiCall.bind(this, 'chat.getPermalink')) as Method<methods.ChatGetPermalinkArguments>,
-    meMessage: (this.apiCall.bind(this, 'chat.meMessage')) as Method<methods.ChatMeMessageArguments>,
-    postEphemeral: (this.apiCall.bind(this, 'chat.postEphemeral')) as Method<methods.ChatPostEphemeralArguments>,
-    postMessage: (this.apiCall.bind(this, 'chat.postMessage')) as Method<methods.ChatPostMessageArguments>,
-    unfurl: (this.apiCall.bind(this, 'chat.unfurl')) as Method<methods.ChatUnfurlArguments>,
-    update: (this.apiCall.bind(this, 'chat.update')) as Method<methods.ChatUpdateArguments>,
-  }] chat method family
- * @property {module:@slack/client/dist/WebClient.__object} [conversations={
-    archive: (this.apiCall.bind(this, 'conversations.archive')) as Method<methods.ConversationsArchiveArguments>,
-    close: (this.apiCall.bind(this, 'conversations.close')) as Method<methods.ConversationsCloseArguments>,
-    create: (this.apiCall.bind(this, 'conversations.create')) as Method<methods.ConversationsCreateArguments>,
-    history: (this.apiCall.bind(this, 'conversations.history')) as Method<methods.ConversationsHistoryArguments>,
-    info: (this.apiCall.bind(this, 'conversations.info')) as Method<methods.ConversationsInfoArguments>,
-    invite: (this.apiCall.bind(this, 'conversations.invite')) as Method<methods.ConversationsInviteArguments>,
-    join: (this.apiCall.bind(this, 'conversations.join')) as Method<methods.ConversationsJoinArguments>,
-    kick: (this.apiCall.bind(this, 'conversations.kick')) as Method<methods.ConversationsKickArguments>,
-    leave: (this.apiCall.bind(this, 'conversations.leave')) as Method<methods.ConversationsLeaveArguments>,
-    list: (this.apiCall.bind(this, 'conversations.list')) as Method<methods.ConversationsListArguments>,
-    members: (this.apiCall.bind(this, 'conversations.members')) as Method<methods.ConversationsMembersArguments>,
-    open: (this.apiCall.bind(this, 'conversations.open')) as Method<methods.ConversationsOpenArguments>,
-    rename: (this.apiCall.bind(this, 'conversations.rename')) as Method<methods.ConversationsRenameArguments>,
-    replies: (this.apiCall.bind(this, 'conversations.replies')) as Method<methods.ConversationsRepliesArguments>,
-    setPurpose:
-      (this.apiCall.bind(this, 'conversations.setPurpose')) as Method<methods.ConversationsSetPurposeArguments>,
-    setTopic: (this.apiCall.bind(this, 'conversations.setTopic')) as Method<methods.ConversationsSetTopicArguments>,
-    unarchive: (this.apiCall.bind(this, 'conversations.unarchive')) as Method<methods.ConversationsUnarchiveArguments>,
-  }] conversations method family
- * @property {module:@slack/client/dist/WebClient.__object} [dialog={
-    open: (this.apiCall.bind(this, 'dialog.open')) as Method<methods.DialogOpenArguments>,
-  }] dialog method family
- * @property {module:@slack/client/dist/WebClient.__object} [dnd={
-    endDnd: (this.apiCall.bind(this, 'dnd.endDnd')) as Method<methods.DndEndDndArguments>,
-    endSnooze: (this.apiCall.bind(this, 'dnd.endSnooze')) as Method<methods.DndEndSnoozeArguments>,
-    info: (this.apiCall.bind(this, 'dnd.info')) as Method<methods.DndInfoArguments>,
-    setSnooze: (this.apiCall.bind(this, 'dnd.setSnooze')) as Method<methods.DndSetSnoozeArguments>,
-    teamInfo: (this.apiCall.bind(this, 'dnd.teamInfo')) as Method<methods.DndTeamInfoArguments>,
-  }] dnd method family
- * @property {module:@slack/client/dist/WebClient.__object} [emoji={
-    list: (this.apiCall.bind(this, 'emoji.list')) as Method<methods.EmojiListArguments>,
-  }] emoji method family
- * @property {module:@slack/client/dist/WebClient.__object} [files={
-    delete: (this.apiCall.bind(this, 'files.delete')) as Method<methods.FilesDeleteArguments>,
-    info: (this.apiCall.bind(this, 'files.info')) as Method<methods.FilesInfoArguments>,
-    list: (this.apiCall.bind(this, 'files.list')) as Method<methods.FilesListArguments>,
-    revokePublicURL:
-      (this.apiCall.bind(this, 'files.revokePublicURL')) as Method<methods.FilesRevokePublicURLArguments>,
-    sharedPublicURL:
-      (this.apiCall.bind(this, 'files.sharedPublicURL')) as Method<methods.FilesSharedPublicURLArguments>,
-    upload: (this.apiCall.bind(this, 'files.upload')) as Method<methods.FilesUploadArguments>,
-    comments: {
-      add: (this.apiCall.bind(this, 'files.comments.add')) as Method<methods.FilesCommentsAddArguments>,
-      delete: (this.apiCall.bind(this, 'files.comments.delete')) as Method<methods.FilesCommentsDeleteArguments>,
-      edit: (this.apiCall.bind(this, 'files.comments.edit')) as Method<methods.FilesCommentsEditArguments>,
-    },
-  }] files method family
- * @property {module:@slack/client/dist/WebClient.__object} [groups={
-    archive: (this.apiCall.bind(this, 'groups.archive')) as Method<methods.GroupsArchiveArguments>,
-    create: (this.apiCall.bind(this, 'groups.create')) as Method<methods.GroupsCreateArguments>,
-    createChild: (this.apiCall.bind(this, 'groups.createChild')) as Method<methods.GroupsCreateChildArguments>,
-    history: (this.apiCall.bind(this, 'groups.history')) as Method<methods.GroupsHistoryArguments>,
-    info: (this.apiCall.bind(this, 'groups.info')) as Method<methods.GroupsInfoArguments>,
-    invite: (this.apiCall.bind(this, 'groups.invite')) as Method<methods.GroupsInviteArguments>,
-    kick: (this.apiCall.bind(this, 'groups.kick')) as Method<methods.GroupsKickArguments>,
-    leave: (this.apiCall.bind(this, 'groups.leave')) as Method<methods.GroupsLeaveArguments>,
-    list: (this.apiCall.bind(this, 'groups.list')) as Method<methods.GroupsListArguments>,
-    mark: (this.apiCall.bind(this, 'groups.mark')) as Method<methods.GroupsMarkArguments>,
-    open: (this.apiCall.bind(this, 'groups.open')) as Method<methods.GroupsOpenArguments>,
-    rename: (this.apiCall.bind(this, 'groups.rename')) as Method<methods.GroupsRenameArguments>,
-    replies: (this.apiCall.bind(this, 'groups.replies')) as Method<methods.GroupsRepliesArguments>,
-    setPurpose: (this.apiCall.bind(this, 'groups.setPurpose')) as Method<methods.GroupsSetPurposeArguments>,
-    setTopic: (this.apiCall.bind(this, 'groups.setTopic')) as Method<methods.GroupsSetTopicArguments>,
-    unarchive: (this.apiCall.bind(this, 'groups.unarchive')) as Method<methods.GroupsUnarchiveArguments>,
-  }] groups method family
- * @property {module:@slack/client/dist/WebClient.__object} [im={
-    close: (this.apiCall.bind(this, 'im.close')) as Method<methods.IMCloseArguments>,
-    history: (this.apiCall.bind(this, 'im.history')) as Method<methods.IMHistoryArguments>,
-    list: (this.apiCall.bind(this, 'im.list')) as Method<methods.IMListArguments>,
-    mark: (this.apiCall.bind(this, 'im.mark')) as Method<methods.IMMarkArguments>,
-    open: (this.apiCall.bind(this, 'im.open')) as Method<methods.IMOpenArguments>,
-    replies: (this.apiCall.bind(this, 'im.replies')) as Method<methods.IMRepliesArguments>,
-  }] im method family
- * @property {module:@slack/client/dist/WebClient.__object} [migration={
-    exchange: (this.apiCall.bind(this, 'migration.exchange')) as Method<methods.MigrationExchangeArguments>,
-  }] migration method family
- * @property {module:@slack/client/dist/WebClient.__object} [mpim={
-    close: (this.apiCall.bind(this, 'mpim.close')) as Method<methods.MPIMCloseArguments>,
-    history: (this.apiCall.bind(this, 'mpim.history')) as Method<methods.MPIMHistoryArguments>,
-    list: (this.apiCall.bind(this, 'mpim.list')) as Method<methods.MPIMListArguments>,
-    mark: (this.apiCall.bind(this, 'mpim.mark')) as Method<methods.MPIMMarkArguments>,
-    open: (this.apiCall.bind(this, 'mpim.open')) as Method<methods.MPIMOpenArguments>,
-    replies: (this.apiCall.bind(this, 'mpim.replies')) as Method<methods.MPIMRepliesArguments>,
-  }] mpim method family
- * @property {module:@slack/client/dist/WebClient.__object} [oauth={
-    access: (this.apiCall.bind(this, 'oauth.access')) as Method<methods.OAuthAccessArguments>,
-    token: (this.apiCall.bind(this, 'oauth.token')) as Method<methods.OAuthTokenArguments>,
-  }] oauth method family
- * @property {module:@slack/client/dist/WebClient.__object} [pins={
-    add: (this.apiCall.bind(this, 'pins.add')) as Method<methods.PinsAddArguments>,
-    list: (this.apiCall.bind(this, 'pins.list')) as Method<methods.PinsListArguments>,
-    remove: (this.apiCall.bind(this, 'pins.remove')) as Method<methods.PinsRemoveArguments>,
-  }] pins method family
- * @property {module:@slack/client/dist/WebClient.__object} [reactions={
-    add: (this.apiCall.bind(this, 'reactions.add')) as Method<methods.ReactionsAddArguments>,
-    get: (this.apiCall.bind(this, 'reactions.get')) as Method<methods.ReactionsGetArguments>,
-    list: (this.apiCall.bind(this, 'reactions.list')) as Method<methods.ReactionsListArguments>,
-    remove: (this.apiCall.bind(this, 'reactions.remove')) as Method<methods.ReactionsRemoveArguments>,
-  }] reactions method family
- * @property {module:@slack/client/dist/WebClient.__object} [reminders={
-    add: (this.apiCall.bind(this, 'reminders.add')) as Method<methods.RemindersAddArguments>,
-    complete: (this.apiCall.bind(this, 'reminders.complete')) as Method<methods.RemindersCompleteArguments>,
-    delete: (this.apiCall.bind(this, 'reminders.delete')) as Method<methods.RemindersDeleteArguments>,
-    info: (this.apiCall.bind(this, 'reminders.info')) as Method<methods.RemindersInfoArguments>,
-    list: (this.apiCall.bind(this, 'reminders.list')) as Method<methods.RemindersListArguments>,
-  }] reminders method family
- * @property {module:@slack/client/dist/WebClient.__object} [rtm={
-    connect: (this.apiCall.bind(this, 'rtm.connect')) as Method<methods.RTMConnectArguments>,
-    start: (this.apiCall.bind(this, 'rtm.start')) as Method<methods.RTMStartArguments>,
-  }] rtm method family
- * @property {module:@slack/client/dist/WebClient.__object} [search={
-    all: (this.apiCall.bind(this, 'search.all')) as Method<methods.SearchAllArguments>,
-    files: (this.apiCall.bind(this, 'search.files')) as Method<methods.SearchFilesArguments>,
-    messages: (this.apiCall.bind(this, 'search.messages')) as Method<methods.SearchMessagesArguments>,
-  }] search method family
- * @property {module:@slack/client/dist/WebClient.__object} [stars={
-    add: (this.apiCall.bind(this, 'stars.add')) as Method<methods.StarsAddArguments>,
-    list: (this.apiCall.bind(this, 'stars.list')) as Method<methods.StarsListArguments>,
-    remove: (this.apiCall.bind(this, 'stars.remove')) as Method<methods.StarsRemoveArguments>,
-  }] stars method family
- * @property {module:@slack/client/dist/WebClient.__object} [team={
-    accessLogs: (this.apiCall.bind(this, 'team.accessLogs')) as Method<methods.TeamAccessLogsArguments>,
-    billableInfo: (this.apiCall.bind(this, 'team.billableInfo')) as Method<methods.TeamBillableInfoArguments>,
-    info: (this.apiCall.bind(this, 'team.info')) as Method<methods.TeamInfoArguments>,
-    integrationLogs: (this.apiCall.bind(this, 'team.integrationLogs')) as Method<methods.TeamIntegrationLogsArguments>,
-    profile: {
-      get: (this.apiCall.bind(this, 'team.profile.get')) as Method<methods.TeamProfileGetArguments>,
-    },
-  }] team method family
- * @property {module:@slack/client/dist/WebClient.__object} [usergroups={
-    create: (this.apiCall.bind(this, 'usergroups.create')) as Method<methods.UsergroupsCreateArguments>,
-    disable: (this.apiCall.bind(this, 'usergroups.disable')) as Method<methods.UsergroupsDisableArguments>,
-    enable: (this.apiCall.bind(this, 'usergroups.enable')) as Method<methods.UsergroupsEnableArguments>,
-    list: (this.apiCall.bind(this, 'usergroups.list')) as Method<methods.UsergroupsListArguments>,
-    update: (this.apiCall.bind(this, 'usergroups.update')) as Method<methods.UsergroupsUpdateArguments>,
-    users: {
-      list: (this.apiCall.bind(this, 'usergroups.users.list')) as Method<methods.UsergroupsUsersListArguments>,
-      update: (this.apiCall.bind(this, 'usergroups.users.update')) as Method<methods.UsergroupsUsersUpdateArguments>,
-    },
-  }] usergroups method family
- * @property {module:@slack/client/dist/WebClient.__object} [users={
-    deletePhoto: (this.apiCall.bind(this, 'users.deletePhoto')) as Method<methods.UsersDeletePhotoArguments>,
-    getPresence: (this.apiCall.bind(this, 'users.getPresence')) as Method<methods.UsersGetPresenceArguments>,
-    identity: (this.apiCall.bind(this, 'users.identity')) as Method<methods.UsersIdentityArguments>,
-    info: (this.apiCall.bind(this, 'users.info')) as Method<methods.UsersInfoArguments>,
-    list: (this.apiCall.bind(this, 'users.list')) as Method<methods.UsersListArguments>,
-    lookupByEmail: (this.apiCall.bind(this, 'users.lookupByEmail')) as Method<methods.UsersLookupByEmailArguments>,
-    setActive: (this.apiCall.bind(this, 'users.setActive')) as Method<methods.UsersSetActiveArguments>,
-    setPhoto: (this.apiCall.bind(this, 'users.setPhoto')) as Method<methods.UsersSetPhotoArguments>,
-    setPresence: (this.apiCall.bind(this, 'users.setPresence')) as Method<methods.UsersSetPresenceArguments>,
-    profile: {
-      get: (this.apiCall.bind(this, 'users.profile.get')) as Method<methods.UsersProfileGetArguments>,
-      set: (this.apiCall.bind(this, 'users.profile.set')) as Method<methods.UsersProfileSetArguments>,
-    },
-  }] users method family
  */
 export class WebClient {
   /**

From e96b059f52ce759cbec62ade38dd12937720c991 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Thu, 15 Mar 2018 09:47:20 +0100
Subject: [PATCH 15/24] add assertion for filename

---
 src/WebClient.spec.js | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index 4bb8cca4f..9334374a4 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -217,13 +217,18 @@ describe('WebClient', function () {
 
         // intentially vague about the method name
         return this.client.apiCall('upload', {
-          file: { value: imageBuffer, options: { filename: 'train.png' } },
-          filename: 'train.png',
+          file: { value: imageBuffer, options: { filename: 'train.jpg' } },
+          filename: 'train.jpg',
         })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
-            assert.include(file, { fieldname: 'file' });
+            assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
+            // TODO: understand why this assertion was failing. already employed the buffer metadata workaround, should
+            // look into the details about whether that workaround is still required, or why else the `source.on` is not
+            // defined error would occur, or if Slack just doesn't need a filename for the part
+            // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
+            // this was happening in the old implementation.
           });
       });
 
@@ -256,14 +261,14 @@ describe('WebClient', function () {
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
-            // TODO: understand why this assertion is failing. already employed the buffer metadata workaround, should
+            // TODO: understand why this assertion was failing. already employed the buffer metadata workaround, should
             // look into the details about whether that workaround is still required, or why else the `source.on` is not
             // defined error would occur, or if Slack just doesn't need a filename for the part
-            // assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
+            assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
 
             // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
             // this was happening in the old implementation.
-            assert.include(file, { fieldname: 'file' });
+            // assert.include(file, { fieldname: 'file' });
           });
       });
 

From ba661a7824af21862d4ffa4e29d3111583c2e721 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Thu, 15 Mar 2018 09:58:37 +0100
Subject: [PATCH 16/24] put forEach statement in one line

---
 src/WebClient.spec.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index 9334374a4..010fc270a 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -424,9 +424,7 @@ describe('WebClient', function () {
           // verify that any requests after maxRequestConcurrency were delayed by the responseDelay
           const queuedResponses = responses.slice(1);// the second response
           const minDiff = concurrentResponses[concurrentResponses.length - 1].diff + responseDelay;
-          queuedResponses.forEach(r => {
-            assert.isAtLeast(r.diff, minDiff)
-          });
+          queuedResponses.forEach(r => { assert.isAtLeast(r.diff, minDiff) });
         });
     });
 

From 45c77022a81cd2631a5a2bd3ee0dd29e401f51d7 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Wed, 14 Mar 2018 10:32:17 +0100
Subject: [PATCH 17/24] fix file upload - consider metadata options by creating
 form data, related to #307

---
 .vscode/settings.json | 11 +++---
 package-lock.json     |  2 +-
 src/WebClient.spec.js | 90 ++++++++++++++++++++++++-------------------
 src/WebClient.ts      | 28 +++++++-------
 4 files changed, 72 insertions(+), 59 deletions(-)

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 187764097..1c85fa9ac 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,6 +1,7 @@
 {
-  "typescript.tsdk": "./node_modules/typescript/lib",
-  "editor.rulers": [
-    120
-  ]
-}
+    "typescript.tsdk": "./node_modules/typescript/lib",
+    "editor.rulers": [
+        120
+    ],
+    "editor.tabSize": 2,
+}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index beab36912..9327ccfd3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6404,4 +6404,4 @@
       "dev": true
     }
   }
-}
+}
\ No newline at end of file
diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index 7f42efba8..7392b9227 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -69,12 +69,12 @@ describe('WebClient', function () {
     });
   });
 
-  describe('apiCall()', function() {
+  describe('apiCall()', function () {
     beforeEach(function () {
       this.client = new WebClient(token, { retryConfig: fastRetriesForTest });
     });
 
-    describe('when making a successful call', function() {
+    describe('when making a successful call', function () {
       beforeEach(function () {
         this.scope = nock('https://slack.com')
           .post(/api/)
@@ -154,9 +154,9 @@ describe('WebClient', function () {
           hum: false,
         },
       })
-      .then(() => {
-        scope.done();
-      });
+        .then(() => {
+          scope.done();
+        });
     });
 
     it.skip('should remove undefined or null values from API arguments');
@@ -206,18 +206,28 @@ describe('WebClient', function () {
 
         // intentially vague about the method name
         return this.client.apiCall('upload', {
-            file: imageBuffer,
-            filename: 'train.png',
-          })
+          file: imageBuffer,
+          filename: 'train.png',
+        })
+          .then((parts) => {
+            assert.lengthOf(parts.files, 1);
+            const file = parts.files[0];
+            // options were not provided to the form builder
+            assert.include(file, { fieldname: 'file' });
+          });
+      });
+
+      it('should properly serialize when the file is an object with value as a Buffer and options containing filename', function () {
+        const imageBuffer = fs.readFileSync(path.resolve('test', 'fixtures', 'train.jpg'));
+
+        // intentially vague about the method name
+        return this.client.apiCall('upload', {
+          file: { value: imageBuffer, options: { filename: 'train.png' } },
+          filename: 'train.png',
+        })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
-            // TODO: understand why this assertion is failing. already employed the buffer metadata workaround, should
-            // look into the details about whether that workaround is still required, or why else the `source.on` is not
-            // defined error would occur, or if Slack just doesn't need a filename for the part
-            // assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
-            // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
-            // this was happening in the old implementation.
             assert.include(file, { fieldname: 'file' });
           });
       });
@@ -230,8 +240,8 @@ describe('WebClient', function () {
 
         // intentially vague about the method name
         return this.client.apiCall('upload', {
-            file: imageBuffer,
-          })
+          file: imageBuffer,
+        })
           .then(() => {
             const output = this.capture.getCapturedText();
             assert.isNotEmpty(output);
@@ -246,8 +256,8 @@ describe('WebClient', function () {
         const imageStream = fs.createReadStream(path.resolve('test', 'fixtures', 'train.jpg'));
 
         return this.client.apiCall('upload', {
-            file: imageStream,
-          })
+          file: imageStream,
+        })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
@@ -270,20 +280,20 @@ describe('WebClient', function () {
     describe('metadata in the user agent', function () {
       it('should set the user agent to contain package metadata', function () {
         const scope = nock('https://slack.com', {
-            reqheaders: {
-              'User-Agent': (value) => {
-                const metadata = parseUserAgentIntoMetadata(value)
-                // NOTE: this assert isn't that strong and doesn't say anything about the values. at this time, there
-                // isn't a good way to test this without dupicating the logic of the code under test.
-                assert.containsAllKeys(metadata, ['node', '@slack:client']);
-                // NOTE: there's an assumption that if there's any keys besides these left at all, its the platform part
-                delete metadata.node;
-                delete metadata['@slack:client'];
-                assert.isNotEmpty(metadata);
-                return true;
-              },
+          reqheaders: {
+            'User-Agent': (value) => {
+              const metadata = parseUserAgentIntoMetadata(value)
+              // NOTE: this assert isn't that strong and doesn't say anything about the values. at this time, there
+              // isn't a good way to test this without dupicating the logic of the code under test.
+              assert.containsAllKeys(metadata, ['node', '@slack:client']);
+              // NOTE: there's an assumption that if there's any keys besides these left at all, its the platform part
+              delete metadata.node;
+              delete metadata['@slack:client'];
+              assert.isNotEmpty(metadata);
+              return true;
             },
-          })
+          },
+        })
           .post(/api/)
           .reply(200, { ok: true });
         return this.client.apiCall('method')
@@ -296,14 +306,14 @@ describe('WebClient', function () {
         const [name, version] = ['appmedataname', 'appmetadataversion'];
         addAppMetadata({ name, version });
         const scope = nock('https://slack.com', {
-            reqheaders: {
-              'User-Agent': (value) => {
-                const metadata = parseUserAgentIntoMetadata(value)
-                assert.propertyVal(metadata, name, version);
-                return true;
-              },
+          reqheaders: {
+            'User-Agent': (value) => {
+              const metadata = parseUserAgentIntoMetadata(value)
+              assert.propertyVal(metadata, name, version);
+              return true;
             },
-          })
+          },
+        })
           .post(/api/)
           .reply(200, { ok: true });
         // NOTE: appMetaData is only evalued on client construction, so we cannot use the client already created
@@ -351,7 +361,7 @@ describe('WebClient', function () {
     });
   })
 
-  describe('has option to change slackApiUrl', function() {
+  describe('has option to change slackApiUrl', function () {
     it('should send requests to an alternative URL', function () {
       const alternativeUrl = 'http://12.34.56.78/api/';
       const scope = nock(alternativeUrl)
@@ -364,7 +374,7 @@ describe('WebClient', function () {
 
   describe('has an option to set a custom HTTP agent', function () {
     // not confident how to test this. one idea is to use sinon to intercept method calls on the agent.
-    it.skip('should send a request using the custom agent', function() {
+    it.skip('should send a request using the custom agent', function () {
       const agent = new Agent();
       const client = new WebClient(token, { agent });
       return client.apiCall('method');
diff --git a/src/WebClient.ts b/src/WebClient.ts
index 6b4fa4cad..5326bb989 100644
--- a/src/WebClient.ts
+++ b/src/WebClient.ts
@@ -524,18 +524,16 @@ export class WebClient extends EventEmitter {
       //                      'fail. add the `filename` option to fix.');
       //   }
 
-        // Buffers are sometimes not handled well by the underlying `form-data` package. Adding extra metadata resolves
-        // that issue. See: https://github.com/slackapi/node-slack-sdk/issues/307#issuecomment-289231737
-        // @ts-ignore
-      //   options.file = {
-      //     // @ts-ignore
-      //     value: options.file,
-      //     options: {
-      //       // @ts-ignore
-      //       filename: options.filename,
-      //     },
-      //   };
-      // }
+      // Buffers are sometimes not handled well by the underlying `form-data` package. Adding extra metadata resolves
+      // that issue. See: https://github.com/slackapi/node-slack-sdk/issues/307#issuecomment-289231737
+      if (options['file'] && !options['file'].value) {
+        options['file'] = {
+          value: options['file'],
+          options: {
+            filename: options['filename'],
+          },
+        };
+      }
     }
 
     const flattened = objectEntries(options)
@@ -555,6 +553,10 @@ export class WebClient extends EventEmitter {
     // a body with binary data should be serialized as multipart/form-data
     if (containsBinaryData) {
       return flattened.reduce((form, [key, value]) => {
+        if (key === 'file' && value.value) {
+          form.append(key, value.value, value.options);
+          return form;
+        }
         form.append(key, value);
         return form;
       }, new FormData());
@@ -658,7 +660,7 @@ interface FormCanBeURLEncoded {
   [key: string]: string | number | boolean;
 }
 
-interface BodyCanBeFormMultipart extends Readable {}
+interface BodyCanBeFormMultipart extends Readable { }
 
 /**
  * Determines whether a request body object should be treated as FormData-encodable (Content-Type=multipart/form-data).

From c1d65b58eb872565b572e6a05bd7c9f3ece5657c Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Wed, 14 Mar 2018 14:22:02 +0100
Subject: [PATCH 18/24] fix unregular build failure

---
 src/WebClient.spec.js | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index 7392b9227..f422b874b 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -420,7 +420,7 @@ describe('WebClient', function () {
           // verify that any requests after maxRequestConcurrency were delayed by the responseDelay
           const queuedResponses = responses.slice(3);
           const minDiff = concurrentResponses[concurrentResponses.length - 1].diff + responseDelay;
-          queuedResponses.forEach(r => assert.isAbove(r.diff, minDiff));
+          queuedResponses.forEach(r => assert.isAtLeast(r.diff, minDiff));
         });
     });
 
@@ -433,13 +433,15 @@ describe('WebClient', function () {
           assert.lengthOf(responses, 2);
 
           // verify that maxRequestConcurrency requets were all sent concurrently
-          const concurrentResponses = responses.slice(0, 1); // the first 3 responses
+          const concurrentResponses = responses.slice(0, 1); // the first response
           concurrentResponses.forEach(r => assert.isBelow(r.diff, responseDelay));
 
           // verify that any requests after maxRequestConcurrency were delayed by the responseDelay
-          const queuedResponses = responses.slice(1);
+          const queuedResponses = responses.slice(1);// the second response
           const minDiff = concurrentResponses[concurrentResponses.length - 1].diff + responseDelay;
-          queuedResponses.forEach(r => assert.isAbove(r.diff, minDiff));
+          queuedResponses.forEach(r => {
+            assert.isAtLeast(r.diff, minDiff)
+          });
         });
     });
 

From bb5854186d3644c16a77ee7c51c925793d943cc0 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Thu, 15 Mar 2018 09:47:20 +0100
Subject: [PATCH 19/24] add assertion for filename

---
 src/WebClient.spec.js | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index f422b874b..6db7859f8 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -222,13 +222,18 @@ describe('WebClient', function () {
 
         // intentially vague about the method name
         return this.client.apiCall('upload', {
-          file: { value: imageBuffer, options: { filename: 'train.png' } },
-          filename: 'train.png',
+          file: { value: imageBuffer, options: { filename: 'train.jpg' } },
+          filename: 'train.jpg',
         })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
-            assert.include(file, { fieldname: 'file' });
+            assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
+            // TODO: understand why this assertion was failing. already employed the buffer metadata workaround, should
+            // look into the details about whether that workaround is still required, or why else the `source.on` is not
+            // defined error would occur, or if Slack just doesn't need a filename for the part
+            // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
+            // this was happening in the old implementation.
           });
       });
 
@@ -261,14 +266,14 @@ describe('WebClient', function () {
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
             const file = parts.files[0];
-            // TODO: understand why this assertion is failing. already employed the buffer metadata workaround, should
+            // TODO: understand why this assertion was failing. already employed the buffer metadata workaround, should
             // look into the details about whether that workaround is still required, or why else the `source.on` is not
             // defined error would occur, or if Slack just doesn't need a filename for the part
-            // assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
+            assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
 
             // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
             // this was happening in the old implementation.
-            assert.include(file, { fieldname: 'file' });
+            // assert.include(file, { fieldname: 'file' });
           });
       });
 

From e7bbd382c1885bdb2086ef4ef6a962ac1ce6b73d Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Thu, 15 Mar 2018 09:58:37 +0100
Subject: [PATCH 20/24] put forEach statement in one line

---
 src/WebClient.spec.js | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index 6db7859f8..c20fa45ec 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -444,9 +444,7 @@ describe('WebClient', function () {
           // verify that any requests after maxRequestConcurrency were delayed by the responseDelay
           const queuedResponses = responses.slice(1);// the second response
           const minDiff = concurrentResponses[concurrentResponses.length - 1].diff + responseDelay;
-          queuedResponses.forEach(r => {
-            assert.isAtLeast(r.diff, minDiff)
-          });
+          queuedResponses.forEach(r => { assert.isAtLeast(r.diff, minDiff) });
         });
     });
 

From b0a7d94b0bfc07e724618e4a8f1084f19ac2b1ca Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Thu, 15 Mar 2018 14:22:57 +0100
Subject: [PATCH 21/24] resolve merge conflict

---
 package-lock.json | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 7d7555bce..9327ccfd3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,10 +1,6 @@
 {
   "name": "@slack/client",
-<<<<<<< HEAD
   "version": "4.0.1",
-=======
-  "version": "4.0.0",
->>>>>>> ba661a7824af21862d4ffa4e29d3111583c2e721
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {

From 189905039fc426074f55477529a76330553330de Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Thu, 15 Mar 2018 16:09:22 +0100
Subject: [PATCH 22/24] increase test timeout in order to avoid unexpected
 build failure

---
 test/typescript/test.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/typescript/test.ts b/test/typescript/test.ts
index de174327c..a64fca825 100644
--- a/test/typescript/test.ts
+++ b/test/typescript/test.ts
@@ -4,7 +4,7 @@ import { check, checkDirectory } from 'typings-tester';
 describe('typescript typings tests', () => {
   it('should allow WebClient to work without a token', () => {
     check([`${__dirname}/sources/webclient-no-token.ts`], `${__dirname}/tsconfig-strict.json`);
-  });
+  }).timeout(10000);
 
   it('should export method argument types and enforce strictness in the right ways', () => {
     check([`${__dirname}/sources/method-argument-types.ts`], `${__dirname}/tsconfig-strict.json`);

From 6de72b3a9ea858db7eac91990e9e09c1f170286f Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Fri, 16 Mar 2018 10:24:48 +0100
Subject: [PATCH 23/24] increase mocha tests timeout to 10 sec

---
 test/mocha.opts         | 2 +-
 test/typescript/test.ts | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/test/mocha.opts b/test/mocha.opts
index cd6c16f33..3711a4423 100644
--- a/test/mocha.opts
+++ b/test/mocha.opts
@@ -1,4 +1,4 @@
 --require ts-node/register
 --require source-map-support/register
 --recursive
---timeout 4000
+--timeout 10000
diff --git a/test/typescript/test.ts b/test/typescript/test.ts
index a64fca825..de174327c 100644
--- a/test/typescript/test.ts
+++ b/test/typescript/test.ts
@@ -4,7 +4,7 @@ import { check, checkDirectory } from 'typings-tester';
 describe('typescript typings tests', () => {
   it('should allow WebClient to work without a token', () => {
     check([`${__dirname}/sources/webclient-no-token.ts`], `${__dirname}/tsconfig-strict.json`);
-  }).timeout(10000);
+  });
 
   it('should export method argument types and enforce strictness in the right ways', () => {
     check([`${__dirname}/sources/method-argument-types.ts`], `${__dirname}/tsconfig-strict.json`);

From 7c89cac23ee4e70ae35269a23ab5c23e492b4376 Mon Sep 17 00:00:00 2001
From: Anton Kharitonov <anton.kharitonov@sap.com>
Date: Tue, 20 Mar 2018 14:37:40 +0100
Subject: [PATCH 24/24] remove check for options in file attribute, remove unit
 test

---
 src/WebClient.spec.js | 34 ++++++++--------------------------
 src/WebClient.ts      | 18 +++++++++---------
 2 files changed, 17 insertions(+), 35 deletions(-)

diff --git a/src/WebClient.spec.js b/src/WebClient.spec.js
index c20fa45ec..9ca3c34a5 100644
--- a/src/WebClient.spec.js
+++ b/src/WebClient.spec.js
@@ -207,7 +207,7 @@ describe('WebClient', function () {
         // intentially vague about the method name
         return this.client.apiCall('upload', {
           file: imageBuffer,
-          filename: 'train.png',
+          filename: 'train.jpg',
         })
           .then((parts) => {
             assert.lengthOf(parts.files, 1);
@@ -217,38 +217,20 @@ describe('WebClient', function () {
           });
       });
 
-      it('should properly serialize when the file is an object with value as a Buffer and options containing filename', function () {
-        const imageBuffer = fs.readFileSync(path.resolve('test', 'fixtures', 'train.jpg'));
-
-        // intentially vague about the method name
-        return this.client.apiCall('upload', {
-          file: { value: imageBuffer, options: { filename: 'train.jpg' } },
-          filename: 'train.jpg',
-        })
-          .then((parts) => {
-            assert.lengthOf(parts.files, 1);
-            const file = parts.files[0];
-            assert.include(file, { fieldname: 'file', filename: 'train.jpg' });
-            // TODO: understand why this assertion was failing. already employed the buffer metadata workaround, should
-            // look into the details about whether that workaround is still required, or why else the `source.on` is not
-            // defined error would occur, or if Slack just doesn't need a filename for the part
-            // NOTE: it seems the file and its filename are emitted as a field in addition to the token, not sure if
-            // this was happening in the old implementation.
-          });
-      });
-
       // Reactivate this test once we find out if the workaround in the test case before is necessary
-      it.skip('should log a warning when file is a Buffer and there is no filename', function () {
+      it('should log a warning when file is a Buffer and there is no filename', function () {
         const imageBuffer = fs.readFileSync(path.resolve('test', 'fixtures', 'train.jpg'));
-        this.capture = new CaptureStdout();
-        this.capture.startCapture();
+        const output = [];
+        const stub = function (level, message) {
+          output.push([level, message]);
+        }
+        const debuggingClient = new WebClient(token, { logLevel: LogLevel.WARN, logger: stub });
 
         // intentially vague about the method name
-        return this.client.apiCall('upload', {
+        return debuggingClient.apiCall('upload', {
           file: imageBuffer,
         })
           .then(() => {
-            const output = this.capture.getCapturedText();
             assert.isNotEmpty(output);
             const anyLogLineIsLevelWarn = output.reduce((acc, line) => {
               return acc || (line.indexOf('warn') !== -1)
diff --git a/src/WebClient.ts b/src/WebClient.ts
index 5326bb989..130b9283d 100644
--- a/src/WebClient.ts
+++ b/src/WebClient.ts
@@ -517,16 +517,16 @@ export class WebClient extends EventEmitter {
       //
       // This could also be resolved by making the above condition a type guard for FilesUploadArguments. Let's expore
       // this solution when all the arguments in `./methods.ts` are more fully defined.
+
       // @ts-ignore
-      // if (Buffer.isBuffer((options as WebAPICallOptions).file)) {
-      //   if (!('filename' in options)) {
-      //     this.logger.warn('`file` option is a Buffer, but there is no `filename` option. this upload will likely ' +
-      //                      'fail. add the `filename` option to fix.');
-      //   }
-
-      // Buffers are sometimes not handled well by the underlying `form-data` package. Adding extra metadata resolves
-      // that issue. See: https://github.com/slackapi/node-slack-sdk/issues/307#issuecomment-289231737
-      if (options['file'] && !options['file'].value) {
+      if (Buffer.isBuffer((options as WebAPICallOptions).file)) {
+        if (!('filename' in options)) {
+          this.logger.warn('`file` option is a Buffer, but there is no `filename` option. this upload will likely ' +
+            'fail. add the `filename` option to fix.');
+        }
+
+        // Buffers are sometimes not handled well by the underlying `form-data` package. Adding extra metadata resolves
+        // that issue. See: https://github.com/slackapi/node-slack-sdk/issues/307#issuecomment-289231737
         options['file'] = {
           value: options['file'],
           options: {