fix(build): missing babel helpers, true esm modules, simplify (#290)

* fix(build): remove redundent Rollup Flow plugin

- This is already handled by babel-preset-flow

* fix(build): no longer override esm build with commonjs

- Use Rollup for both cjs and esm build
- Don't re-run babel on top preventing overrides

* fix(build): Don't exlude Babel helpers from bundle

- Since only the typeof helper is used, it's much more simple and
efficient to include it.

* fix(test): allow ES modules require in smoke tests

.travis.yml

@@ -24,7 +24,7 @@ script:
   - yarn run smoke esm 15.6.2
   - yarn run smoke cjs 16.1.0
   - yarn run smoke esm 16.1.0
-  - yarn run smoke cjs default
-  - yarn run smoke esm default
+  - yarn run smoke cjs latest
+  - yarn run smoke esm latest
   - yarn run smoke cjs next
   - yarn run smoke esm next

package.json

@@ -6,14 +6,11 @@
   "module": "dist/esm/index.js",
   "browser": "dist/cjs/index.js",
   "scripts": {
-    "clean": "npm run esm:clean && npm run cjs:clean",
-    "build": "npm run esm:build && npm run cjs:build",
-    "preesm:build": "npm run esm:clean",
-    "esm:build": "babel ./src/ --ignore=*.spec.js --source-maps --out-dir ./dist/esm && flow-copy-source -v --ignore=*.spec.js src/ dist/esm",
-    "esm:clean": "rm -rf ./dist/esm/*",
-    "precjs:build": "npm run cjs:clean",
-    "cjs:build": "rollup --config rollup.config.js",
-    "cjs:clean": "rm -rf ./dist/cjs/*",
+    "build": "rollup -c",
+    "build:flow": "flow-copy-source -v --ignore=*.spec.js src/ dist/cjs",
+    "prebuild": "rm -rf dist/",
+    "postbuild": "npm run build:flow",
+    "prepare": "npm run build",
     "lint": "eslint .",
     "lint:fix": "npm run lint -- --fix",
     "flow": "flow",
@@ -43,7 +40,6 @@
     "babel-cli": "6.26.0",
     "babel-eslint": "8.2.3",
     "babel-jest": "22.2.2",
-    "babel-plugin-external-helpers": "6.22.0",
     "babel-preset-es2015": "6.24.1",
     "babel-preset-flow": "6.23.0",
     "babel-preset-react": "6.24.1",
@@ -58,6 +54,7 @@
     "eslint-plugin-jest": "21.17.0",
     "eslint-plugin-prettier": "2.6.0",
     "eslint-plugin-react": "7.9.1",
+    "esm": "^3.0.51",
     "expect": "22.3.0",
     "flow-bin": "0.74.0",
     "flow-copy-source": "2.0.0",
@@ -73,7 +70,6 @@
     "rollup": "0.60.7",
     "rollup-plugin-babel": "3.0.4",
     "rollup-plugin-commonjs": "9.1.3",
-    "rollup-plugin-flow": "1.1.1",
     "rollup-plugin-node-builtins": "2.1.2",
     "rollup-plugin-node-globals": "1.2.1",
     "rollup-plugin-node-resolve": "3.3.0",

rollup.config.js

@@ -1,26 +1,27 @@
-import fs from 'fs';
 import babel from 'rollup-plugin-babel';
 import commonjs from 'rollup-plugin-commonjs';
-import flow from 'rollup-plugin-flow';
 import resolve from 'rollup-plugin-node-resolve';
 import builtins from 'rollup-plugin-node-builtins';
 import globals from 'rollup-plugin-node-globals';
+import pkg from './package.json';
 
-const extractPackagePeerDependencies = () => {
-  const packageNpm = JSON.parse(
-    fs.readFileSync('./package.json', { encoding: 'utf8' })
-  );
-
-  return Object.keys(packageNpm.peerDependencies || {});
-};
+const extractPackagePeerDependencies = () =>
+  Object.keys(pkg.peerDependencies) || [];
 
 export default {
   input: 'src/index.js',
-  output: {
-    file: 'dist/cjs/index.js',
-    format: 'cjs',
-    sourcemap: true,
-  },
+  output: [
+    {
+      file: pkg.main,
+      format: 'cjs',
+      sourcemap: true,
+    },
+    {
+      file: pkg.module,
+      format: 'es',
+      sourcemap: true,
+    },
+  ],
   external: extractPackagePeerDependencies(),
   plugins: [
     babel({
@@ -39,8 +40,6 @@ export default {
         'react',
         'flow',
       ],
-      plugins: ['external-helpers'],
-      externalHelpers: true,
     }),
     resolve({
       module: true,
@@ -56,6 +55,5 @@ export default {
     }),
     globals(),
     builtins(),
-    flow(),
   ],
 };

tests/smoke/prepare.js

@@ -31,10 +31,6 @@ const deleteExistingDependencies = () => () => {
 };
 
 const preparePackageJson = reactVersion => () => {
-  if (reactVersion === 'default') {
-    return;
-  }
-
   const packageJson = {
     name: 'smoke',
     version: '0.0.1',

tests/smoke/smoke.js

@@ -1,7 +1,8 @@
 #!/usr/bin/env node
 
-/* eslint-disable no-console */
-/* eslint-disable import/no-extraneous-dependencies */
+/* eslint-disable no-console, import/no-extraneous-dependencies, no-global-assign */
+
+require = require('esm')(module);
 
 const requireReactElementToJsxString = buildType => {
   if (buildType === 'esm') {

yarn.lock

@@ -766,12 +766,6 @@ babel-plugin-check-es2015-constants@^6.22.0:
   dependencies:
     babel-runtime "^6.22.0"
 
-babel-plugin-external-helpers@6.22.0:
-  version "6.22.0"
-  resolved "https://registry.yarnpkg.com/babel-plugin-external-helpers/-/babel-plugin-external-helpers-6.22.0.tgz#2285f48b02bd5dede85175caf8c62e86adccefa1"
-  dependencies:
-    babel-runtime "^6.22.0"
-
 babel-plugin-istanbul@^4.1.5:
   version "4.1.5"
   resolved "https://registry.yarnpkg.com/babel-plugin-istanbul/-/babel-plugin-istanbul-4.1.5.tgz#6760cdd977f411d3e175bb064f2bc327d99b2b6e"
@@ -1226,7 +1220,7 @@ babylon@7.0.0-beta.44:
   version "7.0.0-beta.44"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.44.tgz#89159e15e6e30c5096e22d738d8c0af8a0e8ca1d"
 
-babylon@^6.15.0, babylon@^6.18.0:
+babylon@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
 
@@ -2513,6 +2507,10 @@ eslint@4.19.1:
     table "4.0.2"
     text-table "~0.2.0"
 
+esm@^3.0.51:
+  version "3.0.51"
+  resolved "https://registry.yarnpkg.com/esm/-/esm-3.0.51.tgz#35c3bcd0237867ab09020728135bfdb91ec79c90"
+
 espree@^3.5.4:
   version "3.5.4"
   resolved "https://registry.yarnpkg.com/espree/-/espree-3.5.4.tgz#b0f447187c8a8bed944b815a660bddf5deb5d1a7"
@@ -2825,13 +2823,6 @@ flow-copy-source@2.0.0:
     kefir "^3.7.3"
     yargs "^11.0.0"
 
-flow-remove-types@^1.1.0:
-  version "1.2.3"
-  resolved "https://registry.yarnpkg.com/flow-remove-types/-/flow-remove-types-1.2.3.tgz#6131aefc7da43364bb8b479758c9dec7735d1a18"
-  dependencies:
-    babylon "^6.15.0"
-    vlq "^0.2.1"
-
 for-in@^1.0.1, for-in@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/for-in/-/for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
@@ -6021,13 +6012,6 @@ rollup-plugin-commonjs@9.1.3:
     resolve "^1.5.0"
     rollup-pluginutils "^2.0.1"
 
-rollup-plugin-flow@1.1.1:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/rollup-plugin-flow/-/rollup-plugin-flow-1.1.1.tgz#6ce568f1dd559666b77ab76b4bae251407528db6"
-  dependencies:
-    flow-remove-types "^1.1.0"
-    rollup-pluginutils "^1.5.1"
-
 rollup-plugin-node-builtins@2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/rollup-plugin-node-builtins/-/rollup-plugin-node-builtins-2.1.2.tgz#24a1fed4a43257b6b64371d8abc6ce1ab14597e9"
@@ -6063,7 +6047,7 @@ rollup-plugin-sourcemaps@0.4.2:
     rollup-pluginutils "^2.0.1"
     source-map-resolve "^0.5.0"
 
-rollup-pluginutils@^1.5.0, rollup-pluginutils@^1.5.1:
+rollup-pluginutils@^1.5.0:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-1.5.2.tgz#1e156e778f94b7255bfa1b3d0178be8f5c552408"
   dependencies: