Reduce standalone build size (#10668)

* infra: build standalone against src

* infra: add absoluteRuntime

# Conflicts:
#	babel.config.js

* chore: remove `process.env` replace

* add $ to signify exact match

credits to Nicolò

babel.config.js

@@ -11,6 +11,7 @@ module.exports = function(api) {
     exclude: ["transform-typeof-symbol"],
   };
   const envOpts = Object.assign({}, envOptsNoTargets);
+  let transformRuntimeOpts = null;
 
   let convertESM = true;
   let ignoreLib = true;
@@ -50,6 +51,17 @@ module.exports = function(api) {
       break;
   }
 
+  if (includeRuntime) {
+    const babelRuntimePackageJSONPath = require.resolve(
+      "@babel/runtime/package.json"
+    );
+    const path = require("path");
+    transformRuntimeOpts = {
+      version: require(babelRuntimePackageJSONPath).version,
+      absoluteRuntime: path.dirname(babelRuntimePackageJSONPath),
+    };
+  }
+
   const config = {
     // Our dependencies are all standard CommonJS, along with all sorts of
     // other random files in Babel's codebase, so we use script as the default,
@@ -125,10 +137,7 @@ module.exports = function(api) {
         ],
         plugins: [
           includeRuntime
-            ? [
-                "@babel/transform-runtime",
-                { version: require("@babel/runtime/package").version },
-              ]
+            ? ["@babel/transform-runtime", transformRuntimeOpts]
             : null,
         ].filter(Boolean),
       },

packages/babel-core/package.json

@@ -34,7 +34,9 @@
   },
   "browser": {
     "./lib/config/files/index.js": "./lib/config/files/index-browser.js",
-    "./lib/transform-file.js": "./lib/transform-file-browser.js"
+    "./lib/transform-file.js": "./lib/transform-file-browser.js",
+    "./src/config/files/index.js": "./src/config/files/index-browser.js",
+    "./src/transform-file.js": "./src/transform-file-browser.js"
   },
   "dependencies": {
     "@babel/code-frame": "^7.5.5",

scripts/gulp-tasks.js

@@ -11,6 +11,7 @@
  * to make standalone builds of other Babel plugins/presets (such as babel-minify)
  */
 
+const fs = require("fs");
 const path = require("path");
 const pump = require("pump");
 const chalk = require("chalk");
@@ -24,6 +25,19 @@ const WarningsToErrorsPlugin = require("warnings-to-errors-webpack-plugin");
 const webpackStream = require("webpack-stream");
 const uglify = require("gulp-uglify");
 
+function generateResolveAlias() {
+  const alias = {};
+  const packagePath = path.resolve(process.cwd(), "packages");
+  fs.readdirSync(packagePath).forEach(folder => {
+    alias[folder.replace("babel-", "@babel/") + "$"] = path.resolve(
+      packagePath,
+      folder,
+      "src"
+    );
+  });
+  return alias;
+}
+
 function webpackBuild(opts) {
   const plugins = opts.plugins || [];
   let babelVersion = require("../packages/babel-core/package.json").version;
@@ -71,7 +85,6 @@ function webpackBuild(opts) {
       }),
       new webpack.DefinePlugin({
         "process.env.NODE_ENV": '"production"',
-        "process.env": JSON.stringify({ NODE_ENV: "production" }),
         BABEL_VERSION: JSON.stringify(babelVersion),
         VERSION: JSON.stringify(version),
       }),
@@ -82,6 +95,8 @@ function webpackBuild(opts) {
       new webpack.optimize.ModuleConcatenationPlugin(),
     ].concat(plugins),
     resolve: {
+      //todo: remove resolve.alias when babel packages offer ESModule entry
+      alias: generateResolveAlias(),
       plugins: [
         // Dedupe packages that are used across multiple plugins.
         // This replaces DedupePlugin from Webpack 1.x