From e34dab9b72442a85ce45bc19699e949b22c7aa45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Greg=20Berg=C3=A9?= <greg@smooth-code.com>
Date: Sun, 12 May 2019 15:06:02 +0200
Subject: [PATCH] Remove rollup, simplify code

---
 .npmignore          |   17 +-
 .size-snapshot.json |   21 -
 babel.config.js     |   11 +-
 benchmarks/index.js |    2 +-
 package-lock.json   | 1751 ++-----------------------------------------
 package.json        |   18 +-
 rollup.config.js    |   57 --
 src/index.js        |  199 ++---
 test/index.js       |   12 -
 test/styles.js      |   68 +-
 10 files changed, 172 insertions(+), 1984 deletions(-)
 delete mode 100644 .size-snapshot.json
 delete mode 100644 rollup.config.js

diff --git a/.npmignore b/.npmignore
index b62fff18b..a11534aad 100644
--- a/.npmignore
+++ b/.npmignore
@@ -1,3 +1,14 @@
-/*
-!/dist/**/*.js
-!/props.js
\ No newline at end of file
+.DS_Store
+.prettierrc
+.nyc_output
+.travis.yml
+coverage
+coverage.lcov
+benchmarks
+docs
+src
+examples
+babel.config.js
+test
+CONTRIBUTING.md
+CODE_OF_CONDUCT.md
diff --git a/.size-snapshot.json b/.size-snapshot.json
deleted file mode 100644
index 656b47309..000000000
--- a/.size-snapshot.json
+++ /dev/null
@@ -1,21 +0,0 @@
-{
-  "dist/styled-system.cjs.js": {
-    "bundled": 18794,
-    "minified": 11425,
-    "gzipped": 3172
-  },
-  "dist/styled-system.esm.js": {
-    "bundled": 16608,
-    "minified": 9477,
-    "gzipped": 2776,
-    "treeshaked": {
-      "rollup": {
-        "code": 79,
-        "import_statements": 44
-      },
-      "webpack": {
-        "code": 1112
-      }
-    }
-  }
-}
diff --git a/babel.config.js b/babel.config.js
index 3eaf5273f..f5578660a 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -1,7 +1,16 @@
 module.exports = {
   env: {
     test: {
-      presets: [['@babel/preset-env', { loose: true }], '@babel/react'],
+      presets: [['@babel/env', { loose: true }], '@babel/react'],
+      plugins: ['@babel/transform-runtime'],
+    },
+    cjs: {
+      presets: [['@babel/env', { loose: true }]],
+      plugins: ['@babel/transform-runtime'],
+    },
+    esm: {
+      presets: [['@babel/env', { loose: true, modules: false }]],
+      plugins: [['@babel/transform-runtime', { useESModules: true }]],
     },
   },
 }
diff --git a/benchmarks/index.js b/benchmarks/index.js
index f46ec7875..429f162ab 100644
--- a/benchmarks/index.js
+++ b/benchmarks/index.js
@@ -4,7 +4,7 @@ const Benchmark = require('benchmark')
 const libs = [
   {
     name: 'actual',
-    module: require('../dist/styled-system.cjs'),
+    module: require('../dist/index.cjs'),
   },
   {
     name: 'v4',
diff --git a/package-lock.json b/package-lock.json
index a674c940c..b53333e1e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -46,6 +46,24 @@
         "slide": "^1.1.5"
       }
     },
+    "@babel/cli": {
+      "version": "7.4.4",
+      "resolved": "https://registry.npmjs.org/@babel/cli/-/cli-7.4.4.tgz",
+      "integrity": "sha512-XGr5YjQSjgTa6OzQZY57FAJsdeVSAKR/u/KA5exWIz66IKtv/zXtHy+fIZcMry/EgYegwuHE7vzGnrFhjdIAsQ==",
+      "dev": true,
+      "requires": {
+        "chokidar": "^2.0.4",
+        "commander": "^2.8.1",
+        "convert-source-map": "^1.1.0",
+        "fs-readdir-recursive": "^1.1.0",
+        "glob": "^7.0.0",
+        "lodash": "^4.17.11",
+        "mkdirp": "^0.5.1",
+        "output-file-sync": "^2.0.0",
+        "slash": "^2.0.0",
+        "source-map": "^0.5.0"
+      }
+    },
     "@babel/code-frame": {
       "version": "7.0.0",
       "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
@@ -1547,251 +1565,6 @@
         "any-observable": "^0.3.0"
       }
     },
-    "@types/estree": {
-      "version": "0.0.39",
-      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.39.tgz",
-      "integrity": "sha512-EYNwp3bU+98cpU4lAWYYL7Zz+2gryWH1qbdDTidVd6hkiR6weksdbMadyXKXNPEkQFhXM+hVO9ZygomHXp+AIw==",
-      "dev": true
-    },
-    "@types/node": {
-      "version": "11.13.8",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-11.13.8.tgz",
-      "integrity": "sha512-szA3x/3miL90ZJxUCzx9haNbK5/zmPieGraZEe4WI+3srN0eGLiT22NXeMHmyhNEopn+IrxqMc7wdVwvPl8meg==",
-      "dev": true
-    },
-    "@types/resolve": {
-      "version": "0.0.8",
-      "resolved": "https://registry.npmjs.org/@types/resolve/-/resolve-0.0.8.tgz",
-      "integrity": "sha512-auApPaJf3NPfe18hSoJkp8EbZzer2ISk7o8mCC3M9he/a04+gbMF97NkpD2S8riMGvm4BMRI59/SZQSaLTKpsQ==",
-      "dev": true,
-      "requires": {
-        "@types/node": "*"
-      }
-    },
-    "@webassemblyjs/ast": {
-      "version": "1.8.5",
-      "resolved": "https://registry.npmjs.org/@webassemblyjs/ast/-/ast-1.8.5.tgz",
-      "integrity": "sha512-aJMfngIZ65+t71C3y2nBBg5FFG0Okt9m0XEgWZ7Ywgn1oMAT8cNwx00Uv1cQyHtidq0Xn94R4TAywO+LCQ+ZAQ==",
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-        "@webassemblyjs/helper-wasm-bytecode": "1.8.5",
-        "@webassemblyjs/wast-parser": "1.8.5"
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-      "version": "6.10.0",
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-      "integrity": "sha512-nffhOpkymDECQyR0mnsUtoCE8RlX38G0rYP+wgLWFyZuUyuuojSSvi/+euOiQBIn63whYwYVIIH1TvE3tu4OEg==",
-      "dev": true,
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-        "json-schema-traverse": "^0.4.1",
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-    "ajv-errors": {
-      "version": "1.0.1",
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-      "dev": true
-    },
-    "ajv-keywords": {
-      "version": "3.4.0",
-      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-3.4.0.tgz",
-      "integrity": "sha512-aUjdRFISbuFOl0EIZc+9e4FfZp0bDZgAdOOf30bJmw8VM9v84SHyVyxDfbWxpGYbdZD/9XoKxfHVNmxPkhwyGw==",
-      "dev": true
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@@ -1838,12 +1611,6 @@
         "normalize-path": "^2.1.1"
       }
     },
-    "aproba": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
-      "integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
-      "dev": true
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@@ -1918,43 +1685,6 @@
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       "dev": true
     },
-    "asn1.js": {
-      "version": "4.10.1",
-      "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
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-      "version": "1.4.1",
-      "resolved": "https://registry.npmjs.org/assert/-/assert-1.4.1.tgz",
-      "integrity": "sha1-mZEtWRg2tab1s0XA8H7vwI/GXZE=",
-      "dev": true,
-      "requires": {
-        "util": "0.10.3"
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-      "dependencies": {
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-          "version": "2.0.1",
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-          "integrity": "sha1-sX0I0ya0Qj5Wjv9xn5GwscvfafE=",
-          "dev": true
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-        "util": {
-          "version": "0.10.3",
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-          "integrity": "sha1-evsa/lCAUkZInj23/g7TeTNqwPk=",
-          "dev": true,
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     "assign-symbols": {
       "version": "1.0.0",
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-        "source-map": "^0.6.1",
-        "terser": "^3.16.1",
-        "webpack-sources": "^1.1.0",
-        "worker-farm": "^1.5.2"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
-    "through2": {
-      "version": "2.0.5",
-      "resolved": "https://registry.npmjs.org/through2/-/through2-2.0.5.tgz",
-      "integrity": "sha512-/mrRod8xqpA+IHSLyGCQ2s8SPHiCDEeQJSep1jqLYeEUClOFG2Qsh+4FU6G9VeqpZnGW/Su8LQGc4YKni5rYSQ==",
-      "dev": true,
-      "requires": {
-        "readable-stream": "~2.3.6",
-        "xtend": "~4.0.1"
-      }
-    },
     "time-zone": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/time-zone/-/time-zone-1.0.0.tgz",
@@ -9270,21 +7777,6 @@
       "integrity": "sha1-8y6srFoXW+ol1/q1Zas+2HQe9W8=",
       "dev": true
     },
-    "timers-browserify": {
-      "version": "2.0.10",
-      "resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-2.0.10.tgz",
-      "integrity": "sha512-YvC1SV1XdOUaL6gx5CoGroT3Gu49pK9+TZ38ErPldOWW4j49GI1HKs9DV+KGq/w6y+LZ72W1c8cKz2vzY+qpzg==",
-      "dev": true,
-      "requires": {
-        "setimmediate": "^1.0.4"
-      }
-    },
-    "to-arraybuffer": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/to-arraybuffer/-/to-arraybuffer-1.0.1.tgz",
-      "integrity": "sha1-fSKbH8xjfkZsoIEYCDanqr/4P0M=",
-      "dev": true
-    },
     "to-fast-properties": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
@@ -9363,18 +7855,6 @@
       "integrity": "sha512-4krF8scpejhaOgqzBEcGM7yDIEfi0/8+8zDRZhNZZ2kjmHJ4hv3zCbQWxoJGz1iw5U0Jl0nma13xzHXcncMavQ==",
       "dev": true
     },
-    "tty-browserify": {
-      "version": "0.0.0",
-      "resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.0.tgz",
-      "integrity": "sha1-oVe6QC2iTpv5V/mqadUk7tQpAaY=",
-      "dev": true
-    },
-    "typedarray": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
-      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
-      "dev": true
-    },
     "uid2": {
       "version": "0.0.3",
       "resolved": "https://registry.npmjs.org/uid2/-/uid2-0.0.3.tgz",
@@ -9444,24 +7924,6 @@
         }
       }
     },
-    "unique-filename": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.1.tgz",
-      "integrity": "sha512-Vmp0jIp2ln35UTXuryvjzkjGdRyf9b2lTXuSYUiPmzRcl3FDtYqAwOnTJkAngD9SWhnoJzDbTKwaOrZ+STtxNQ==",
-      "dev": true,
-      "requires": {
-        "unique-slug": "^2.0.0"
-      }
-    },
-    "unique-slug": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-2.0.1.tgz",
-      "integrity": "sha512-n9cU6+gITaVu7VGj1Z8feKMmfAjEAQGhwD9fE3zvpRRa0wEIx8ODYkVGfSc94M2OX00tUFV8wH3zYbm1I8mxFg==",
-      "dev": true,
-      "requires": {
-        "imurmurhash": "^0.1.4"
-      }
-    },
     "unique-string": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unique-string/-/unique-string-1.0.0.tgz",
@@ -9552,39 +8014,12 @@
         "xdg-basedir": "^3.0.0"
       }
     },
-    "uri-js": {
-      "version": "4.2.2",
-      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
-      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
-      "dev": true,
-      "requires": {
-        "punycode": "^2.1.0"
-      }
-    },
     "urix": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
       "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
       "dev": true
     },
-    "url": {
-      "version": "0.11.0",
-      "resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
-      "integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
-      "dev": true,
-      "requires": {
-        "punycode": "1.3.2",
-        "querystring": "0.2.0"
-      },
-      "dependencies": {
-        "punycode": {
-          "version": "1.3.2",
-          "resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
-          "integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0=",
-          "dev": true
-        }
-      }
-    },
     "url-parse-lax": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/url-parse-lax/-/url-parse-lax-1.0.0.tgz",
@@ -9600,15 +8035,6 @@
       "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
       "dev": true
     },
-    "util": {
-      "version": "0.11.1",
-      "resolved": "https://registry.npmjs.org/util/-/util-0.11.1.tgz",
-      "integrity": "sha512-HShAsny+zS2TZfaXxD9tYj4HQGlBezXZMZuM/S5PKLLoZkShZiGk9o5CzukI1LVHZvjdvZ2Sj1aW/Ndn2NB/HQ==",
-      "dev": true,
-      "requires": {
-        "inherits": "2.0.3"
-      }
-    },
     "util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
@@ -9625,26 +8051,6 @@
         "spdx-expression-parse": "^3.0.0"
       }
     },
-    "vm-browserify": {
-      "version": "0.0.4",
-      "resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-0.0.4.tgz",
-      "integrity": "sha1-XX6kW7755Kb/ZflUOOCofDV9WnM=",
-      "dev": true,
-      "requires": {
-        "indexof": "0.0.1"
-      }
-    },
-    "watchpack": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.6.0.tgz",
-      "integrity": "sha512-i6dHe3EyLjMmDlU1/bGQpEw25XSjkJULPuAVKCbNRefQVq48yXKUpwg538F7AZTf9kyr57zj++pQFltUa5H7yA==",
-      "dev": true,
-      "requires": {
-        "chokidar": "^2.0.2",
-        "graceful-fs": "^4.1.2",
-        "neo-async": "^2.5.0"
-      }
-    },
     "wcwidth": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/wcwidth/-/wcwidth-1.0.1.tgz",
@@ -9654,56 +8060,6 @@
         "defaults": "^1.0.3"
       }
     },
-    "webpack": {
-      "version": "4.30.0",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.30.0.tgz",
-      "integrity": "sha512-4hgvO2YbAFUhyTdlR4FNyt2+YaYBYHavyzjCMbZzgglo02rlKi/pcsEzwCuCpsn1ryzIl1cq/u8ArIKu8JBYMg==",
-      "dev": true,
-      "requires": {
-        "@webassemblyjs/ast": "1.8.5",
-        "@webassemblyjs/helper-module-context": "1.8.5",
-        "@webassemblyjs/wasm-edit": "1.8.5",
-        "@webassemblyjs/wasm-parser": "1.8.5",
-        "acorn": "^6.0.5",
-        "acorn-dynamic-import": "^4.0.0",
-        "ajv": "^6.1.0",
-        "ajv-keywords": "^3.1.0",
-        "chrome-trace-event": "^1.0.0",
-        "enhanced-resolve": "^4.1.0",
-        "eslint-scope": "^4.0.0",
-        "json-parse-better-errors": "^1.0.2",
-        "loader-runner": "^2.3.0",
-        "loader-utils": "^1.1.0",
-        "memory-fs": "~0.4.1",
-        "micromatch": "^3.1.8",
-        "mkdirp": "~0.5.0",
-        "neo-async": "^2.5.0",
-        "node-libs-browser": "^2.0.0",
-        "schema-utils": "^1.0.0",
-        "tapable": "^1.1.0",
-        "terser-webpack-plugin": "^1.1.0",
-        "watchpack": "^1.5.0",
-        "webpack-sources": "^1.3.0"
-      }
-    },
-    "webpack-sources": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/webpack-sources/-/webpack-sources-1.3.0.tgz",
-      "integrity": "sha512-OiVgSrbGu7NEnEvQJJgdSFPl2qWKkWq5lHMhgiToIiN9w34EBnjYzSYs+VbL5KoYiLNtFFa7BZIKxRED3I32pA==",
-      "dev": true,
-      "requires": {
-        "source-list-map": "^2.0.0",
-        "source-map": "~0.6.1"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
     "well-known-symbols": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/well-known-symbols/-/well-known-symbols-2.0.0.tgz",
@@ -9728,15 +8084,6 @@
         "string-width": "^2.1.1"
       }
     },
-    "worker-farm": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/worker-farm/-/worker-farm-1.6.0.tgz",
-      "integrity": "sha512-6w+3tHbM87WnSWnENBUvA2pxJPLhQUg5LKwUQHq3r+XPhIM+Gh2R5ycbwPCyuGbNg+lPgdcnQUhuC02kJCvffQ==",
-      "dev": true,
-      "requires": {
-        "errno": "~0.1.7"
-      }
-    },
     "wrap-ansi": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-3.0.1.tgz",
@@ -9776,12 +8123,6 @@
       "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
       "dev": true
     },
-    "y18n": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
-      "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==",
-      "dev": true
-    },
     "yallist": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
diff --git a/package.json b/package.json
index d9efd99e9..c6c9a700f 100644
--- a/package.json
+++ b/package.json
@@ -2,13 +2,15 @@
   "name": "styled-system",
   "version": "4.2.1",
   "description": "Responsive, theme-based style props for building design systems with React",
-  "main": "dist/styled-system.cjs.js",
-  "module": "dist/styled-system.esm.js",
+  "main": "dist/index.cjs.js",
+  "module": "dist/index.esm.js",
   "sideEffects": false,
   "scripts": {
-    "prepare": "rollup -c",
+    "prepare": "mkdirp dist && npm run build:cjs && npm run build:esm",
     "prettier": "prettier \"{src,test,examples}/**/*.js\" --write",
     "clean": "rm -rf dist",
+    "build:cjs": "NODE_ENV=cjs babel src -o dist/index.cjs.js",
+    "build:esm": "NODE_ENV=esm babel src -o dist/index.esm.js",
     "logo": "npx repng docs/src/logo/index.js -d docs/static -f logo.png -w 512 -h 512",
     "logo-svg": "npx scrs docs/src/logo/index.js --svg > docs/static/logo.svg",
     "logo-white": "npx scrs docs/src/logo/white.js --svg > docs/static/logo-white.svg",
@@ -27,6 +29,7 @@
   "author": "Brent Jackson",
   "license": "MIT",
   "devDependencies": {
+    "@babel/cli": "^7.2.3",
     "@babel/core": "^7.4.0",
     "@babel/plugin-transform-runtime": "^7.4.0",
     "@babel/preset-env": "^7.4.2",
@@ -35,7 +38,6 @@
     "@emotion/core": "^10.0.9",
     "@emotion/styled": "^10.0.9",
     "ava": "^1.3.1",
-    "babel-plugin-annotate-pure-calls": "^0.4.0",
     "benchmark": "^2.1.4",
     "husky": "^1.3.1",
     "lint-staged": "^8.1.5",
@@ -43,13 +45,6 @@
     "prettier": "^1.16.4",
     "react": "^16.8.5",
     "react-test-renderer": "^16.8.5",
-    "rollup": "^1.10.1",
-    "rollup-plugin-babel": "^4.3.2",
-    "rollup-plugin-commonjs": "^9.3.4",
-    "rollup-plugin-node-resolve": "^4.2.3",
-    "rollup-plugin-replace": "^2.2.0",
-    "rollup-plugin-size-snapshot": "^0.8.0",
-    "rollup-plugin-terser": "^4.0.4",
     "styled-components": "^4.2.0"
   },
   "ava": {
@@ -83,7 +78,6 @@
   },
   "dependencies": {
     "@babel/runtime": "^7.4.2",
-    "deepmerge": "^3.2.0",
     "prop-types": "^15.7.2"
   },
   "husky": {
diff --git a/rollup.config.js b/rollup.config.js
deleted file mode 100644
index 26ddcea7d..000000000
--- a/rollup.config.js
+++ /dev/null
@@ -1,57 +0,0 @@
-import nodeResolve from 'rollup-plugin-node-resolve'
-import babel from 'rollup-plugin-babel'
-import replace from 'rollup-plugin-replace'
-import commonjs from 'rollup-plugin-commonjs'
-import { terser } from 'rollup-plugin-terser'
-import { sizeSnapshot } from 'rollup-plugin-size-snapshot'
-import pkg from './package.json'
-
-const input = 'src/index.js'
-const name = 'styledSystem'
-
-const external = id => !id.startsWith('.') && !id.startsWith('/')
-
-const getBabelOptions = ({ useESModules }) => ({
-  exclude: '**/node_modules/**',
-  runtimeHelpers: true,
-  plugins: [
-    'babel-plugin-annotate-pure-calls',
-    ['@babel/plugin-transform-runtime', { useESModules }],
-  ],
-})
-
-export default [
-  {
-    input,
-    output: { file: `dist/styled-system.umd.js`, format: 'umd', name },
-    plugins: [
-      nodeResolve(),
-      commonjs(),
-      babel(getBabelOptions({ useESModules: true })),
-      replace({ 'process.env.NODE_ENV': JSON.stringify('development') }),
-    ],
-  },
-  {
-    input,
-    output: { file: 'dist/styled-system.min.js', format: 'umd', name },
-    plugins: [
-      nodeResolve(),
-      commonjs(),
-      babel(getBabelOptions({ useESModules: true })),
-      replace({ 'process.env.NODE_ENV': JSON.stringify('production') }),
-      terser(),
-    ],
-  },
-  {
-    input,
-    output: { file: pkg.main, format: 'cjs' },
-    external,
-    plugins: [babel(getBabelOptions({ useESModules: false })), sizeSnapshot()],
-  },
-  {
-    input,
-    output: { file: pkg.module, format: 'esm' },
-    external,
-    plugins: [babel(getBabelOptions({ useESModules: true })), sizeSnapshot()],
-  },
-]
diff --git a/src/index.js b/src/index.js
index f50796213..00cf29b64 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,7 +1,5 @@
 import PropTypes from 'prop-types'
-import deepmerge from 'deepmerge' // < 1kb payload overhead when lodash/merge is > 3kb.
 
-// PropTypes
 export const propType = PropTypes.oneOfType([
   PropTypes.number,
   PropTypes.string,
@@ -9,18 +7,14 @@ export const propType = PropTypes.oneOfType([
   PropTypes.object,
 ])
 
-// Utils
 export const cloneFunction = fn => (...args) => fn(...args)
 export const is = n => n !== undefined && n !== null
 export const isObject = n => typeof n === 'object' && n !== null
 export const num = n => typeof n === 'number' && !Number.isNaN(n)
-const string = n => typeof n === 'string' && n !== ''
-const func = n => typeof n === 'function'
+const isString = n => typeof n === 'string' && n !== ''
 const negative = n => n < 0
 
-// Media
 const getBreakpoint = (breakpoints, breakpoint) => {
-  console.log(breakpoints, breakpoint)
   const value = breakpoints[breakpoint]
   if (value === undefined) return false
   return value !== 0 ? value : null
@@ -41,64 +35,43 @@ export const get = (obj, ...paths) => {
 export const themeGet = (path, fallback = null) => props =>
   get(props.theme, path, fallback)
 
-export function merge(acc, item) {
-  if (!item) {
-    return acc
+// loosely based on deepmerge package
+export function merge(a, b) {
+  const result = {}
+  for (const key in a) {
+    result[key] = a[key]
   }
-
-  return deepmerge(acc, item, {
-    clone: false, // No need to clone deep, it's way faster.
-  })
-}
-
-// Style
-function callOrReturn(fn, arg) {
-  if (!func(fn)) return fn
-  const next = fn(arg)
-  return callOrReturn(next, arg)
-}
-
-function getThemeValue(theme, path, initial) {
-  if (!theme) return undefined
-  return callOrReturn(get(initial || theme, path, undefined), { theme })
-}
-
-function getValue(value, variants, theme) {
-  if (is(variants)) {
-    const valueFromVariants = getThemeValue(theme, value, variants)
-    if (is(valueFromVariants)) {
-      return valueFromVariants
+  for (const key in b) {
+    if (!a[key] || typeof a[key] !== 'object') {
+      result[key] = b[key]
+    } else {
+      result[key] = merge(a[key], b[key])
     }
   }
-  return value
+  return result
 }
 
-function styleFromValue(cssProperties, value, theme, key, transformValue) {
-  const variants = getThemeValue(theme, key)
-  const computedValue = getValue(value, variants, theme)
-  if (string(computedValue) || num(computedValue)) {
-    const style = {}
-    for (let i = 0; i < cssProperties.length; i++) {
-      style[cssProperties[i]] = transformValue
+function styleFromValue(cssProperty, value, theme, key, transformValue) {
+  const variants = get(theme, key, undefined)
+  const computedValue = variants ? get(variants, value) : value
+  if (isString(computedValue) || num(computedValue)) {
+    return {
+      [cssProperty]: transformValue
         ? transformValue(computedValue, {
             rawValue: value,
-            variants,
+            variants: variants,
           })
-        : computedValue
+        : computedValue,
     }
-    return style
   }
   return null
 }
 
 function getBreakpoints(theme) {
-  const themeBreakpoints = getThemeValue(theme, 'breakpoints')
-  const breakpoints = is(themeBreakpoints)
-    ? themeBreakpoints
-    : defaultBreakpoints
+  const breakpoints = get(theme, 'breakpoints', defaultBreakpoints)
   // TODO deprecate in v5
   if (Array.isArray(breakpoints)) {
-    const clonedBreakpoints = merge([], breakpoints)
+    const clonedBreakpoints = Object.assign([...breakpoints], breakpoints)
     clonedBreakpoints.unshift(0)
     return clonedBreakpoints
   }
@@ -125,14 +98,14 @@ function createStyleGenerator(getStyle, props, generators) {
   return getStyles
 }
 
-function styleFromBreakPoint(cssProperties, value, theme, key, transformValue) {
+function styleFromBreakPoint(cssProperty, value, theme, key, transformValue) {
   const breakpoints = getBreakpoints(theme)
   const keys = Object.keys(value)
   let allStyle = {}
   for (let i = 0; i < keys.length; i++) {
     const breakpoint = keys[i]
     const style = styleFromValue(
-      cssProperties,
+      cssProperty,
       value[breakpoint],
       theme,
       key,
@@ -155,31 +128,19 @@ function styleFromBreakPoint(cssProperties, value, theme, key, transformValue) {
   return allStyle
 }
 
-function getStyleFactory(prop, cssProperties, key, transformValue) {
+function getStyleFactory(prop, cssProperty, key, transformValue) {
   return function getStyle(attrs, theme) {
     const value = attrs[prop]
     if (!is(value)) return null
 
-    const style = styleFromValue(
-      cssProperties,
-      value,
-      theme,
-      key,
-      transformValue
-    )
+    const style = styleFromValue(cssProperty, value, theme, key, transformValue)
 
     if (style !== null) {
       return style
     }
 
     if (isObject(value)) {
-      return styleFromBreakPoint(
-        cssProperties,
-        value,
-        theme,
-        key,
-        transformValue
-      )
+      return styleFromBreakPoint(cssProperty, value, theme, key, transformValue)
     }
 
     return null
@@ -188,14 +149,13 @@ function getStyleFactory(prop, cssProperties, key, transformValue) {
 
 export function style({
   prop,
-  cssProperties,
   cssProperty,
   alias,
   key = null,
-  transformValue = null,
+  transformValue,
 }) {
-  cssProperties = cssProperties || (cssProperty ? [cssProperty] : [prop])
-  const getStyle = getStyleFactory(prop, cssProperties, key, transformValue)
+  cssProperty = cssProperty || prop
+  const getStyle = getStyleFactory(prop, cssProperty, key, transformValue)
   const generator = createStyleGenerator(getStyle, [prop])
 
   if (!alias) {
@@ -204,7 +164,7 @@ export function style({
 
   return compose(
     generator,
-    style({ prop: alias, cssProperties, key, transformValue })
+    style({ prop: alias, cssProperty, key, transformValue })
   )
 }
 
@@ -224,16 +184,16 @@ function indexGeneratorsByProp(styles) {
 }
 
 export function compose(...generators) {
-  let flatGenerators = []
+  let allGenerators = []
   generators.forEach(gen => {
     if (gen.meta.generators) {
-      flatGenerators = [...flatGenerators, ...gen.meta.generators]
+      allGenerators = [...allGenerators, ...gen.meta.generators]
     } else {
-      flatGenerators.push(gen)
+      allGenerators.push(gen)
     }
   })
 
-  const generatorsByProp = indexGeneratorsByProp(flatGenerators)
+  const generatorsByProp = indexGeneratorsByProp(allGenerators)
 
   function getStyle(attrs, theme) {
     const propKeys = Object.keys(attrs)
@@ -249,7 +209,7 @@ export function compose(...generators) {
     return allStyle
   }
 
-  const props = flatGenerators.reduce(
+  const props = allGenerators.reduce(
     (keys, generator) => [...keys, ...generator.meta.props],
     []
   )
@@ -265,22 +225,16 @@ export const mapProps = mapper => func => {
   return next
 }
 
-// Variant
 export const variant = ({ key, prop = 'variant' }) => props =>
   get(props.theme, [key, props[prop]].join('.')) || null
 
-// Units
 export const px = value => (num(value) && value !== 0 ? `${value}px` : value)
 export const getPx = px
 export const getWidth = n => (!num(n) || n > 1 ? px(n) : `${n * 100}%`)
 
-// Scale
 const DEFAULT_SPACE = [0, 4, 8, 16, 32, 64, 128, 256, 512]
 
-const scale = (defaultVariants = DEFAULT_SPACE) => (
-  transformedValue,
-  { rawValue, variants = defaultVariants }
-) => {
+function scale(transformedValue, { rawValue, variants = DEFAULT_SPACE }) {
   if (!num(rawValue)) {
     return px(variants[rawValue] || rawValue)
   }
@@ -293,85 +247,85 @@ const scale = (defaultVariants = DEFAULT_SPACE) => (
   return px(value * (neg ? -1 : 1))
 }
 
-// Space
+// space
 export const margin = style({
   prop: 'margin',
   alias: 'm',
-  cssProperties: ['margin'],
+  cssProperty: 'margin',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const marginTop = style({
   prop: 'marginTop',
   alias: 'mt',
-  cssProperties: ['marginTop'],
+  cssProperty: 'marginTop',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const marginRight = style({
   prop: 'marginRight',
   alias: 'mr',
-  cssProperties: ['marginRight'],
+  cssProperty: 'marginRight',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const marginBottom = style({
   prop: 'marginBottom',
   alias: 'mb',
-  cssProperties: ['marginBottom'],
+  cssProperty: 'marginBottom',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const marginLeft = style({
   prop: 'marginLeft',
   alias: 'ml',
-  cssProperties: ['marginLeft'],
+  cssProperty: 'marginLeft',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const padding = style({
   prop: 'padding',
   alias: 'p',
-  cssProperties: ['padding'],
+  cssProperty: 'padding',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const paddingTop = style({
   prop: 'paddingTop',
   alias: 'pt',
-  cssProperties: ['paddingTop'],
+  cssProperty: 'paddingTop',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const paddingRight = style({
   prop: 'paddingRight',
   alias: 'pr',
-  cssProperties: ['paddingRight'],
+  cssProperty: 'paddingRight',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const paddingBottom = style({
   prop: 'paddingBottom',
   alias: 'pb',
-  cssProperties: ['paddingBottom'],
+  cssProperty: 'paddingBottom',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const paddingLeft = style({
   prop: 'paddingLeft',
   alias: 'pl',
-  cssProperties: ['paddingLeft'],
+  cssProperty: 'paddingLeft',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const space = mapProps(props => ({
@@ -399,11 +353,20 @@ export const space = mapProps(props => ({
   )
 )
 
-// Typography
+// typography
+const DEFAULT_FONT_SIZES = [12, 14, 16, 20, 24, 32, 48, 64, 72]
+
+function scaleFont(
+  transformedValue,
+  { rawValue, variants = DEFAULT_FONT_SIZES }
+) {
+  return px(variants[rawValue] || rawValue)
+}
+
 export const fontSize = style({
   prop: 'fontSize',
   key: 'fontSizes',
-  transformValue: scale([12, 14, 16, 20, 24, 32, 48, 64, 72]),
+  transformValue: scaleFont,
 })
 
 export const fontFamily = style({
@@ -435,7 +398,7 @@ export const textColor = style({
   key: 'colors',
 })
 
-// Layout
+// layout
 export const display = style({ prop: 'display' })
 
 export const width = style({
@@ -487,7 +450,7 @@ export const size = mapProps(props => ({
 
 export const verticalAlign = style({ prop: 'verticalAlign' })
 
-// Flexboxes
+// flexbox
 export const alignItems = style({ prop: 'alignItems' })
 export const alignContent = style({ prop: 'alignContent' })
 export const justifyItems = style({ prop: 'justifyItems' })
@@ -503,23 +466,23 @@ export const justifySelf = style({ prop: 'justifySelf' })
 export const alignSelf = style({ prop: 'alignSelf' })
 export const order = style({ prop: 'order' })
 
-// Grid
+// grid
 export const gridGap = style({
   prop: 'gridGap',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const gridColumnGap = style({
   prop: 'gridColumnGap',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const gridRowGap = style({
   prop: 'gridRowGap',
   key: 'space',
-  transformValue: scale(),
+  transformValue: scale,
 })
 
 export const gridColumn = style({ prop: 'gridColumn' })
@@ -532,7 +495,7 @@ export const gridTemplateRows = style({ prop: 'gridTemplateRows' })
 export const gridTemplateAreas = style({ prop: 'gridTemplateAreas' })
 export const gridArea = style({ prop: 'gridArea' })
 
-// Backgrounds
+// backgrounds
 export const background = style({ prop: 'background' })
 
 export const backgroundColor = style({
@@ -546,7 +509,7 @@ export const backgroundSize = style({ prop: 'backgroundSize' })
 export const backgroundPosition = style({ prop: 'backgroundPosition' })
 export const backgroundRepeat = style({ prop: 'backgroundRepeat' })
 
-// Borders
+// borders
 
 export const border = style({
   prop: 'border',
@@ -607,13 +570,13 @@ export const borders = compose(
   borderRadius
 )
 
-// Color
+// color
 export const color = compose(
   backgroundColor,
   textColor
 )
 
-// Position
+// position
 export const position = style({ prop: 'position' })
 export const zIndex = style({ prop: 'zIndex', key: 'zIndices' })
 export const top = style({ prop: 'top', transformValue: px })
@@ -621,7 +584,7 @@ export const right = style({ prop: 'right', transformValue: px })
 export const bottom = style({ prop: 'bottom', transformValue: px })
 export const left = style({ prop: 'left', transformValue: px })
 
-// Misc
+// misc
 export const opacity = style({ prop: 'opacity' })
 export const overflow = style({ prop: 'overflow' })
 
@@ -630,7 +593,7 @@ export const boxShadow = style({
   key: 'shadows',
 })
 
-// Variants
+// variants
 export const buttonStyle = variant({ key: 'buttons' })
 export const textStyle = variant({ key: 'textStyles', prop: 'textStyle' })
 export const colorStyle = variant({ key: 'colorStyles', prop: 'colors' })
diff --git a/test/index.js b/test/index.js
index abd1d1eb4..48ad29506 100644
--- a/test/index.js
+++ b/test/index.js
@@ -63,18 +63,6 @@ test('handles aliased props', t => {
   })
 })
 
-// Impossible to ensure, due to perf issues
-// test('long form prop trumps aliased props', t => {
-//   const style = backgroundColor({
-//     theme,
-//     backgroundColor: 'black',
-//     bg: 'blue',
-//   })
-//   t.deepEqual(style, {
-//     backgroundColor: '#111',
-//   })
-// })
-
 test('returns null', t => {
   const style = color({})
   t.is(style, null)
diff --git a/test/styles.js b/test/styles.js
index 57b160706..e8aa0ce4f 100644
--- a/test/styles.js
+++ b/test/styles.js
@@ -11,7 +11,7 @@ import {
   textStyle,
   colorStyle,
   borders,
-} from '../src/index'
+} from '../src'
 
 const theme = {
   colors: {
@@ -34,14 +34,19 @@ test('returns raw color values', t => {
   t.deepEqual(a, { color: 'inherit', backgroundColor: 'tomato' })
 })
 
-// Impossible to ensure, due to perf issues
-// test('backgroundColor prop overrides bg prop', t => {
-//   const a = color({
-//     backgroundColor: 'tomato',
-//     bg: 'blue',
-//   })
-//   t.deepEqual(a, [{ backgroundColor: 'tomato' }])
-// })
+test('relies on object key order', t => {
+  const a = color({
+    backgroundColor: 'tomato',
+    bg: 'blue',
+  })
+  t.deepEqual(a, { backgroundColor: 'blue' })
+
+  const b = color({
+    bg: 'blue',
+    backgroundColor: 'tomato',
+  })
+  t.deepEqual(b, { backgroundColor: 'tomato' })
+})
 
 test('returns a pixel font-size', t => {
   const a = fontSize({ fontSize: 48 })
@@ -174,51 +179,6 @@ test('pl prop sets paddingLeft 0', t => {
   t.deepEqual(styles, { paddingLeft: 0 })
 })
 
-// The order of props matters
-test('px prop overrides pl prop', t => {
-  const styles = space({
-    pl: 1,
-    px: 2,
-  })
-  t.deepEqual(styles, { paddingLeft: '8px', paddingRight: '8px' })
-})
-
-// The order of props matters
-test('py prop overrides pb prop', t => {
-  const styles = space({
-    pb: 1,
-    py: 2,
-  })
-  t.deepEqual(styles, { paddingTop: '8px', paddingBottom: '8px' })
-})
-
-// The order of props matters
-test('mx prop overrides mr prop', t => {
-  const styles = space({
-    mr: 1,
-    mx: 2,
-  })
-  t.deepEqual(styles, { marginLeft: '8px', marginRight: '8px' })
-})
-
-// The order of props matters
-test('my prop overrides mt prop', t => {
-  const styles = space({
-    mt: 1,
-    my: 2,
-  })
-  t.deepEqual(styles, { marginTop: '8px', marginBottom: '8px' })
-})
-
-// The order of props matters
-test('margin overrides m prop', t => {
-  const styles = space({
-    m: 1,
-    margin: 2,
-  })
-  t.deepEqual(styles, { margin: '8px' })
-})
-
 test('space includes propTypes', t => {
   const { propTypes } = space
   t.is(typeof propTypes, 'object')