fix(*): enable separate config for node_modules transpilation

packages/babel-preset-gatsby/package.json

@@ -8,6 +8,7 @@
     "@babel/plugin-transform-runtime": "^7.0.0",
     "@babel/preset-env": "^7.4.1",
     "@babel/preset-react": "^7.0.0",
+    "@babel/runtime": "^7.4.5",
     "babel-plugin-macros": "^2.4.2"
   },
   "peerDependencies": {

packages/babel-preset-gatsby/src/__tests__/index.js

@@ -8,6 +8,7 @@ it(`Specifies proper presets and plugins for test stage`, () => {
     [
       expect.stringContaining(path.join(`@babel`, `preset-env`)),
       {
+        exclude: [`transform-typeof-symbol`],
         corejs: 2,
         loose: true,
         modules: `commonjs`,
@@ -40,8 +41,13 @@ it(`Specifies proper presets and plugins for test stage`, () => {
     [
       expect.stringContaining(path.join(`@babel`, `plugin-transform-runtime`)),
       {
+        absoluteRuntimePath: expect.stringContaining(
+          path.join(`@babel`, `runtime`)
+        ),
+        corejs: false,
         helpers: true,
         regenerator: true,
+        useESModules: false,
       },
     ],
   ])
@@ -63,6 +69,7 @@ it(`Specifies proper presets and plugins for build-html stage`, () => {
     [
       expect.stringContaining(path.join(`@babel`, `preset-env`)),
       {
+        exclude: [`transform-typeof-symbol`],
         corejs: 2,
         loose: true,
         modules: false,
@@ -95,8 +102,13 @@ it(`Specifies proper presets and plugins for build-html stage`, () => {
     [
       expect.stringContaining(path.join(`@babel`, `plugin-transform-runtime`)),
       {
-        helpers: true,
+        absoluteRuntimePath: expect.stringContaining(
+          path.join(`@babel`, `runtime`)
+        ),
+        helpers: false,
         regenerator: true,
+        corejs: false,
+        useESModules: true,
       },
     ],
   ])
@@ -111,6 +123,7 @@ it(`Allows to configure browser targets`, () => {
   expect(presets[0]).toEqual([
     expect.stringContaining(path.join(`@babel`, `preset-env`)),
     {
+      exclude: [`transform-typeof-symbol`],
       corejs: 2,
       loose: true,
       modules: false,

packages/babel-preset-gatsby/src/dependencies.js

@@ -0,0 +1,55 @@
+// This file is heavily based on create-react-app's implementation
+// @see https://github.com/facebook/create-react-app/blob/master/packages/babel-preset-react-app/dependencies.js
+
+const path = require(`path`)
+const resolve = m => require.resolve(m)
+
+module.exports = function(api, options = {}) {
+  const absoluteRuntimePath = path.dirname(
+    resolve(`@babel/runtime/package.json`)
+  )
+
+  return {
+    // Babel assumes ES Modules, which isn't safe until CommonJS
+    // dies. This changes the behavior to assume CommonJS unless
+    // an `import` or `export` is present in the file.
+    // https://github.com/webpack/webpack/issues/4039#issuecomment-419284940
+    sourceType: `unambiguous`,
+    presets: [
+      [
+        // Latest stable ECMAScript features
+        `@babel/preset-env`,
+        {
+          // Allow importing core-js in entrypoint and use browserlist to select polyfills
+          useBuiltIns: `usage`,
+          corejs: 2,
+          modules: false,
+          // Exclude transforms that make all code slower (https://github.com/facebook/create-react-app/pull/5278)
+          exclude: [`transform-typeof-symbol`],
+        },
+      ],
+    ],
+    plugins: [
+      // Polyfills the runtime needed for async/await, generators, and friends
+      // https://babeljs.io/docs/en/babel-plugin-transform-runtime
+      [
+        resolve(`@babel/plugin-transform-runtime`),
+        {
+          corejs: false,
+          helpers: true,
+          regenerator: true,
+          // https://babeljs.io/docs/en/babel-plugin-transform-runtime#useesmodules
+          // We should turn this on once the lowest version of Node LTS
+          // supports ES Modules.
+          useESModules: true,
+          // Undocumented option that lets us encapsulate our runtime, ensuring
+          // the correct version is used
+          // https://github.com/babel/babel/blob/090c364a90fe73d36a30707fc612ce037bdbbb24/packages/babel-plugin-transform-runtime/src/index.js#L35-L42
+          absoluteRuntime: absoluteRuntimePath,
+        },
+      ],
+      // Adds syntax support for import()
+      resolve(`@babel/plugin-syntax-dynamic-import`),
+    ],
+  }
+}

packages/babel-preset-gatsby/src/index.js

@@ -29,6 +29,9 @@ module.exports = function preset(_, options = {}) {
 
   const pluginBabelConfig = loadCachedConfig()
   const stage = process.env.GATSBY_BUILD_STAGE || `test`
+  const absoluteRuntimePath = path.dirname(
+    require.resolve(`@babel/runtime/package.json`)
+  )
 
   if (!targets) {
     if (stage === `build-html` || stage === `test`) {
@@ -50,6 +53,8 @@ module.exports = function preset(_, options = {}) {
           modules: stage === `test` ? `commonjs` : false,
           useBuiltIns: `usage`,
           targets,
+          // Exclude transforms that make all code slower (https://github.com/facebook/create-react-app/pull/5278)
+          exclude: [`transform-typeof-symbol`],
         },
       ],
       [
@@ -73,8 +78,11 @@ module.exports = function preset(_, options = {}) {
       [
         resolve(`@babel/plugin-transform-runtime`),
         {
-          helpers: true,
+          corejs: false,
+          helpers: stage === `develop` || stage === `test`,
           regenerator: true,
+          useESModules: stage !== `test`,
+          absoluteRuntimePath,
         },
       ],
     ],

packages/gatsby/src/utils/__tests__/__snapshots__/webpack-utils.js.snap

@@ -2,7 +2,7 @@
 
 exports[`webpack utils js returns default values without any options 1`] = `
 Object {
-  "exclude": /core-js\\|event-source-polyfill\\|webpack-hot-middleware\\\\/client/,
+  "exclude": /\\(node_modules\\|bower_components\\)/,
   "test": /\\\\\\.\\(js\\|mjs\\|jsx\\)\\$/,
   "type": "javascript/auto",
   "use": Array [
@@ -14,15 +14,28 @@ Object {
 }
 `;
 
-exports[`webpack utils js returns the correct exclude paths 1`] = `
+exports[`webpack utils js returns default values without any options 2`] = `
 Object {
-  "exclude": /core-js\\|event-source-polyfill\\|webpack-hot-middleware\\\\/client\\|node_modules/,
-  "test": /\\\\\\.\\(js\\|mjs\\|jsx\\)\\$/,
+  "exclude": /@babel\\(\\?:\\\\/\\|\\\\\\\\\\{1,2\\}\\)runtime\\|core-js/,
+  "test": /\\\\\\.\\(js\\|mjs\\)\\$/,
   "type": "javascript/auto",
   "use": Array [
     Object {
       "loader": "<PROJECT_ROOT>/packages/gatsby/src/utils/babel-loader.js",
-      "options": Object {},
+      "options": Object {
+        "babelrc": false,
+        "compact": false,
+        "configFile": false,
+        "presets": Array [
+          Array [
+            "<PROJECT_ROOT>/packages/babel-preset-gatsby/dependencies.js",
+            Object {
+              "stage": "develop",
+            },
+          ],
+        ],
+        "sourceMaps": false,
+      },
     },
   ],
 }

packages/gatsby/src/utils/__tests__/webpack-utils.js

@@ -22,10 +22,12 @@ describe(`webpack utils`, () => {
       expect(rule).toMatchSnapshot()
     })
 
-    it(`returns the correct exclude paths`, () => {
-      const rule = config.rules.js({
-        exclude: [`node_modules`],
-      })
+    it(`adds dependency rule`, () => {
+      expect(config.rules.dependencies).toEqual(expect.any(Function))
+    })
+
+    it(`returns default values without any options`, () => {
+      const rule = config.rules.dependencies()
 
       expect(rule).toMatchSnapshot()
     })

packages/gatsby/src/utils/webpack-utils.js

@@ -293,14 +293,10 @@ module.exports = async ({
    * JavaScript loader via babel, excludes node_modules
    */
   {
-    let js = ({ exclude = [], ...options } = {}) => {
-      const excludeRegex = [
-        `core-js|event-source-polyfill|webpack-hot-middleware/client`,
-      ].concat(exclude)
-
+    let js = (options = {}) => {
       return {
         test: /\.(js|mjs|jsx)$/,
-        exclude: new RegExp(excludeRegex.join(`|`)),
+        exclude: vendorRegex,
         type: `javascript/auto`,
         use: [loaders.js(options)],
       }
@@ -309,6 +305,36 @@ module.exports = async ({
     rules.js = js
   }
 
+  /**
+   * Node_modules JavaScript loader via babel (exclude core-js & babel-runtime to speedup babel transpilation)
+   */
+  {
+    let dependencies = (options = {}) => {
+      const jsOptions = {
+        babelrc: false,
+        configFile: false,
+        compact: false,
+        presets: [
+          [require.resolve(`babel-preset-gatsby/dependencies`), { stage }],
+        ],
+        // If an error happens in a package, it's possible to be
+        // because it was compiled. Thus, we don't want the browser
+        // debugger to show the original code. Instead, the code
+        // being evaluated would be much more helpful.
+        sourceMaps: false,
+      }
+
+      return {
+        test: /\.(js|mjs)$/,
+        exclude: /@babel(?:\/|\\{1,2})runtime|core-js/,
+        type: `javascript/auto`,
+        use: [loaders.js(jsOptions)],
+      }
+    }
+
+    rules.dependencies = dependencies
+  }
+
   {
     let eslint = schema => {
       return {

packages/gatsby/src/utils/webpack.config.js

@@ -248,12 +248,6 @@ module.exports = async (program, directory, suppliedStage) => {
   function getModule() {
     const jsOptions = {}
 
-    // Speedup 🏎️💨 the build! We only include transpilation of node_modules on production builds
-    // TODO create gatsby plugin to enable this behaviour on develop (only when people are requesting this feature)
-    if (stage === `develop`) {
-      jsOptions.exclude = [`node_modules`]
-    }
-
     // Common config for every env.
     // prettier-ignore
     let configRules = [
@@ -264,6 +258,13 @@ module.exports = async (program, directory, suppliedStage) => {
       rules.media(),
       rules.miscAssets(),
     ]
+
+    // Speedup 🏎️💨 the build! We only include transpilation of node_modules on javascript production builds
+    // TODO create gatsby plugin to enable this behaviour on develop (only when people are requesting this feature)
+    if (stage === `build-javascript`) {
+      configRules.push(rules.dependencies())
+    }
+
     if (store.getState().themes.themes) {
       configRules = configRules.concat(
         store.getState().themes.themes.map(theme => {

yarn.lock

@@ -1937,6 +1937,7 @@
 "@babel/runtime@^7.4.5":
   version "7.4.5"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.4.5.tgz#582bb531f5f9dc67d2fcb682979894f75e253f12"
+  integrity sha512-TuI4qpWZP6lGOGIuGWtp9sPluqYICmbk8T/1vpSysqJxRPkudh/ofFWyqdcMsDf2s7KvDL4/YHgKyvcS3g9CJQ==
   dependencies:
     regenerator-runtime "^0.13.2"