diff --git a/package-lock.json b/package-lock.json
index b141822..b64483c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -59,6 +59,21 @@
         "url-template": "2.0.8"
       }
     },
+    "@types/acorn": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/@types/acorn/-/acorn-4.0.3.tgz",
+      "integrity": "sha512-gou/kWQkGPMZjdCKNZGDpqxLm9+ErG/pFZKPX4tvCjr0Xf4FCYYX3nAsu7aDVKJV3KUe27+mvqqyWT/9VZoM/A==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.38"
+      }
+    },
+    "@types/estree": {
+      "version": "0.0.38",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.38.tgz",
+      "integrity": "sha512-F/v7t1LwS4vnXuPooJQGBRKRGIoxWUTmA4VHfqjOccFsNDThD5bfUNpITive6s352O7o384wcpEaDV8rHCehDA==",
+      "dev": true
+    },
     "@types/node": {
       "version": "8.10.1",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-8.10.1.tgz",
@@ -1432,9 +1447,9 @@
       }
     },
     "d3plus-dev": {
-      "version": "0.6.5",
-      "resolved": "https://registry.npmjs.org/d3plus-dev/-/d3plus-dev-0.6.5.tgz",
-      "integrity": "sha512-PzQ9Pgc8I0OcrmxqyyEigjhSRNmf+TbQSaKqzOk/jurpD9mC9SZvVZeFQM59e0epFvJsOvrnltC3HLg1AyiVaQ==",
+      "version": "0.6.6",
+      "resolved": "https://registry.npmjs.org/d3plus-dev/-/d3plus-dev-0.6.6.tgz",
+      "integrity": "sha512-SuRudW0eIM20OrNG11WHeMXoRhK8gonQXDSzz/sp8dp6r+CyOs/5Jv5OgmFWMPkELZhDC68zU5nHbJlmO4cx9A==",
       "dev": true,
       "requires": {
         "@octokit/rest": "15.2.6",
@@ -1448,13 +1463,13 @@
         "jsdoc-to-markdown": "4.0.1",
         "live-server": "1.2.0",
         "putasset": "3.1.8",
-        "rollup": "0.56.5",
+        "rollup": "0.57.1",
         "rollup-plugin-buble": "0.19.2",
         "rollup-plugin-commonjs": "9.1.0",
         "rollup-plugin-json": "2.3.0",
         "rollup-plugin-node-resolve": "3.3.0",
         "shelljs": "0.8.1",
-        "tape-run": "3.0.4",
+        "tape-run": "4.0.0",
         "uglify-js": "3.3.16",
         "zora": "2.0.0"
       }
@@ -1582,6 +1597,15 @@
         "assert-plus": "1.0.0"
       }
     },
+    "date-time": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/date-time/-/date-time-2.1.0.tgz",
+      "integrity": "sha512-/9+C44X7lot0IeiyfgJmETtRMhBidBYM2QFFIkGa0U1k+hSyY87Nw7PY3eDqpvCBm7I3WCSfPeZskW/YYq6m4g==",
+      "dev": true,
+      "requires": {
+        "time-zone": "1.0.0"
+      }
+    },
     "debug": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
@@ -1960,7 +1984,7 @@
         "path-is-inside": "1.0.2",
         "pluralize": "7.0.0",
         "progress": "2.0.0",
-        "regexpp": "1.0.1",
+        "regexpp": "1.1.0",
         "require-uncached": "1.0.3",
         "semver": "5.5.0",
         "strip-ansi": "4.0.0",
@@ -4015,21 +4039,21 @@
       }
     },
     "http-errors": {
-      "version": "1.6.2",
-      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.2.tgz",
-      "integrity": "sha1-CgAsyFcHGSp+eUbO7cERVfYOxzY=",
+      "version": "1.6.3",
+      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
+      "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
       "dev": true,
       "requires": {
-        "depd": "1.1.1",
+        "depd": "1.1.2",
         "inherits": "2.0.3",
-        "setprototypeof": "1.0.3",
-        "statuses": "1.3.1"
+        "setprototypeof": "1.1.0",
+        "statuses": "1.5.0"
       },
       "dependencies": {
-        "depd": {
-          "version": "1.1.1",
-          "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.1.tgz",
-          "integrity": "sha1-V4O04cRZ8G+lyif5kfPQbnoxA1k=",
+        "statuses": {
+          "version": "1.5.0",
+          "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+          "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
           "dev": true
         }
       }
@@ -4186,6 +4210,12 @@
       "integrity": "sha1-ftGxQQxqDg94z5XTuEQMY/eLhhQ=",
       "dev": true
     },
+    "irregular-plurals": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/irregular-plurals/-/irregular-plurals-1.4.0.tgz",
+      "integrity": "sha1-LKmwM2UREYVUEvFr5dd8YqRYp2Y=",
+      "dev": true
+    },
     "is-accessor-descriptor": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/is-accessor-descriptor/-/is-accessor-descriptor-1.0.0.tgz",
@@ -4399,6 +4429,15 @@
       "integrity": "sha1-eaKp7OfwlugPNtKy87wWwf9L8/o=",
       "dev": true
     },
+    "is-reference": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/is-reference/-/is-reference-1.1.0.tgz",
+      "integrity": "sha512-h37O/IX4efe56o9k41II1ECMqKwtqHa7/12dLDEzJIFux2x15an4WCDb0/eKdmUgRpLJ3bR0DrzDc7vOrVgRDw==",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.38"
+      }
+    },
     "is-resolvable": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/is-resolvable/-/is-resolvable-1.1.0.tgz",
@@ -4843,6 +4882,12 @@
         "strip-bom": "2.0.0"
       }
     },
+    "locate-character": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/locate-character/-/locate-character-2.0.5.tgz",
+      "integrity": "sha512-n2GmejDXtOPBAZdIiEFy5dJ5N38xBCXLNOtw2WpB9kGh6pnrEuKlwYI+Tkpofc4wDtVXHtoAOJaMRlYG/oYaxg==",
+      "dev": true
+    },
     "lodash": {
       "version": "4.17.5",
       "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.5.tgz",
@@ -5487,6 +5532,12 @@
         "error-ex": "1.3.1"
       }
     },
+    "parse-ms": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/parse-ms/-/parse-ms-1.0.1.tgz",
+      "integrity": "sha1-VjRtR0nXjyNDDKDHE4UK75GqNh0=",
+      "dev": true
+    },
     "parseurl": {
       "version": "1.3.2",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.2.tgz",
@@ -5603,6 +5654,15 @@
         "sax": "0.1.5"
       }
     },
+    "plur": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/plur/-/plur-2.1.2.tgz",
+      "integrity": "sha1-dIJFLBoPUI4+NE6uwxLJHCncZVo=",
+      "dev": true,
+      "requires": {
+        "irregular-plurals": "1.4.0"
+      }
+    },
     "pluralize": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/pluralize/-/pluralize-7.0.0.tgz",
@@ -5637,6 +5697,16 @@
         "meow": "3.7.0"
       }
     },
+    "pretty-ms": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/pretty-ms/-/pretty-ms-3.1.0.tgz",
+      "integrity": "sha1-6crJx2v27lL+lC3ZxsQhMVOxKIE=",
+      "dev": true,
+      "requires": {
+        "parse-ms": "1.0.1",
+        "plur": "2.1.2"
+      }
+    },
     "process-nextick-args": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.0.tgz",
@@ -5964,9 +6034,9 @@
       }
     },
     "regexpp": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-1.0.1.tgz",
-      "integrity": "sha512-8Ph721maXiOYSLtaDGKVmDn5wdsNaF6Px85qFNeMPQq0r8K5Y10tgP6YuR65Ws35n4DvzFcCxEnRNBIXQunzLw==",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/regexpp/-/regexpp-1.1.0.tgz",
+      "integrity": "sha512-LOPw8FpgdQF9etWMaAfG/WRthIdXJGYp4mJ2Jgn/2lpkbod9jPn0t9UqN7AxBOKNfzRbYyVfgc7Vk4t/MpnXgw==",
       "dev": true
     },
     "remove-trailing-separator": {
@@ -6026,6 +6096,12 @@
         "uuid": "3.2.1"
       }
     },
+    "require-relative": {
+      "version": "0.8.7",
+      "resolved": "https://registry.npmjs.org/require-relative/-/require-relative-0.8.7.tgz",
+      "integrity": "sha1-eZlTn8ngR6N5KPoZb44VY9q9Nt4=",
+      "dev": true
+    },
     "require-uncached": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/require-uncached/-/require-uncached-1.0.3.tgz",
@@ -6124,10 +6200,23 @@
       }
     },
     "rollup": {
-      "version": "0.56.5",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.56.5.tgz",
-      "integrity": "sha512-IGPk5vdWrsc4vkiW9XMeXr5QMtxmvATTttTi59w2jBQWe9G/MMQtn8teIBAj+DdK51TrpVT6P0aQUaQUlUYCJA==",
-      "dev": true
+      "version": "0.57.1",
+      "resolved": "https://registry.npmjs.org/rollup/-/rollup-0.57.1.tgz",
+      "integrity": "sha512-I18GBqP0qJoJC1K1osYjreqA8VAKovxuI3I81RSk0Dmr4TgloI0tAULjZaox8OsJ+n7XRrhH6i0G2By/pj1LCA==",
+      "dev": true,
+      "requires": {
+        "@types/acorn": "4.0.3",
+        "acorn": "5.5.3",
+        "acorn-dynamic-import": "3.0.0",
+        "date-time": "2.1.0",
+        "is-reference": "1.1.0",
+        "locate-character": "2.0.5",
+        "pretty-ms": "3.1.0",
+        "require-relative": "0.8.7",
+        "rollup-pluginutils": "2.0.1",
+        "signal-exit": "3.0.2",
+        "sourcemap-codec": "1.4.1"
+      }
     },
     "rollup-plugin-buble": {
       "version": "0.19.2",
@@ -6357,7 +6446,7 @@
         "escape-html": "1.0.3",
         "etag": "1.8.1",
         "fresh": "0.5.2",
-        "http-errors": "1.6.2",
+        "http-errors": "1.6.3",
         "mime": "1.4.1",
         "ms": "2.0.0",
         "on-finished": "2.3.0",
@@ -6398,7 +6487,7 @@
         "batch": "0.6.1",
         "debug": "2.6.9",
         "escape-html": "1.0.3",
-        "http-errors": "1.6.2",
+        "http-errors": "1.6.3",
         "mime-types": "2.1.18",
         "parseurl": "1.3.2"
       },
@@ -6450,9 +6539,9 @@
       }
     },
     "setprototypeof": {
-      "version": "1.0.3",
-      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.0.3.tgz",
-      "integrity": "sha1-ZlZ+NwQ+608E2RvWWMDL77VbjgQ=",
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
+      "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ==",
       "dev": true
     },
     "shebang-command": {
@@ -6722,6 +6811,12 @@
       "integrity": "sha1-PpNdfd1zYxuXZZlW1VEo6HtQhKM=",
       "dev": true
     },
+    "sourcemap-codec": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/sourcemap-codec/-/sourcemap-codec-1.4.1.tgz",
+      "integrity": "sha512-hX1eNBNuilj8yfFnECh0DzLgwKpBLMIvmhgEhixXNui8lMLBInTI8Kyxt++RwJnMNu7cAUo635L2+N1TxMJCzA==",
+      "dev": true
+    },
     "spdx-correct": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/spdx-correct/-/spdx-correct-3.0.0.tgz",
@@ -7215,9 +7310,9 @@
       }
     },
     "tape-run": {
-      "version": "3.0.4",
-      "resolved": "https://registry.npmjs.org/tape-run/-/tape-run-3.0.4.tgz",
-      "integrity": "sha512-nMj/zeUshHQzm0DCsyX/XIsfKUxsvJAEw2yMHuWNB5a0KlvBjzjIpwwEFHo73stUPBReGzEVE1NnS17fF6CIDQ==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/tape-run/-/tape-run-4.0.0.tgz",
+      "integrity": "sha512-FIHUNYhvLSv7h/lxWgej9642h3ZSHNoSBPZOqbCAU9qi4o2CXJbi5wArmrgvPrwoiEIOsF0EWy7Ho7n51Oj7Xg==",
       "dev": true,
       "requires": {
         "@juliangruber/tap-finished": "0.0.2",
@@ -7332,6 +7427,12 @@
         }
       }
     },
+    "time-zone": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/time-zone/-/time-zone-1.0.0.tgz",
+      "integrity": "sha1-mcW/VZWJZq9tBtg73zgA3IL67F0=",
+      "dev": true
+    },
     "tmp": {
       "version": "0.0.33",
       "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
diff --git a/package.json b/package.json
index 031410f..25ecf7e 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "test": "d3plus-test"
   },
   "devDependencies": {
-    "d3plus-dev": "^0.6.5"
+    "d3plus-dev": "^0.6.6"
   },
   "module": "es/index",
   "files": [