Run transform-runtime on the standalone bundle so it stays ES5-compatible. (#8024)

babel.config.js

@@ -13,13 +13,18 @@ module.exports = function(api) {
 
   let convertESM = true;
   let ignoreLib = true;
+  let includeRuntime = false;
 
   switch (env) {
     // Configs used during bundling builds.
     case "babel-parser":
+      convertESM = false;
+      ignoreLib = false;
+      break;
     case "standalone":
       convertESM = false;
       ignoreLib = false;
+      includeRuntime = true;
       break;
     case "production":
       // Config during builds before publish.
@@ -41,6 +46,10 @@ module.exports = function(api) {
   }
 
   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,
+    // and then mark actual modules as modules farther down.
+    sourceType: "script",
     comments: false,
     ignore: [
       // These may not be strictly necessary with the newly-limited scope of
@@ -84,7 +93,29 @@ module.exports = function(api) {
           convertESM ? "@babel/transform-modules-commonjs" : null,
         ].filter(Boolean),
       },
+      {
+        // The vast majority of our src files are modules, but we use
+        // unambiguous to keep things simple until we get around to renaming
+        // the modules to be more easily distinguished from CommonJS
+        test: [
+          "packages/*/src",
+          "packages/*/test",
+          "codemods/*/src",
+          "codemods/*/test",
         ],
+        sourceType: "unambiguous",
+      },
+      {
+        // The runtime transform shouldn't process its own runtime or core-js.
+        exclude: [
+          "packages/babel-runtime",
+          /[\\/]node_modules[\\/](?:@babel\/runtime|babel-runtime|core-js)[\\/]/,
+        ],
+        plugins: [includeRuntime ? "@babel/transform-runtime" : null].filter(
+          Boolean
+        ),
+      },
+    ].filter(Boolean),
   };
 
   // we need to do this as long as we do not test everything from source

package.json

@@ -12,6 +12,7 @@
   "devDependencies": {
     "@babel/cli": "7.0.0-beta.52",
     "@babel/core": "7.0.0-beta.52",
+    "@babel/plugin-transform-runtime": "7.0.0-beta.52",
     "@babel/plugin-proposal-class-properties": "7.0.0-beta.52",
     "@babel/plugin-proposal-export-namespace-from": "7.0.0-beta.52",
     "@babel/plugin-proposal-numeric-separator": "7.0.0-beta.52",
@@ -19,6 +20,7 @@
     "@babel/preset-env": "7.0.0-beta.52",
     "@babel/preset-flow": "7.0.0-beta.52",
     "@babel/register": "7.0.0-beta.52",
+    "@babel/runtime": "7.0.0-beta.52",
     "babel-core": "^7.0.0-0",
     "babel-eslint": "^8.2.6",
     "babel-jest": "^23.4.0",

yarn.lock

@@ -553,6 +553,13 @@
   dependencies:
     regenerator-transform "^0.13.3"
 
+"@babel/plugin-transform-runtime@7.0.0-beta.52":
+  version "7.0.0-beta.52"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-runtime/-/plugin-transform-runtime-7.0.0-beta.52.tgz#12c509000a6e3a8f7cc3cedd15a4dac0653e60a4"
+  dependencies:
+    "@babel/helper-module-imports" "7.0.0-beta.52"
+    "@babel/helper-plugin-utils" "7.0.0-beta.52"
+
 "@babel/plugin-transform-shorthand-properties@7.0.0-beta.52":
   version "7.0.0-beta.52"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-shorthand-properties/-/plugin-transform-shorthand-properties-7.0.0-beta.52.tgz#f3cd777643d66878842a1bad5b95b4cc0b5ecb97"
@@ -657,6 +664,13 @@
     pirates "^3.0.1"
     source-map-support "^0.4.2"
 
+"@babel/runtime@7.0.0-beta.52":
+  version "7.0.0-beta.52"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.0.0-beta.52.tgz#3f3b42b82b92b4e1a283fc78df1bb2fd4ba8d0c7"
+  dependencies:
+    core-js "^2.5.7"
+    regenerator-runtime "^0.12.0"
+
 "@babel/template@7.0.0-beta.40":
   version "7.0.0-beta.40"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.0.0-beta.40.tgz#034988c6424eb5c3268fe6a608626de1f4410fc8"
@@ -6965,6 +6979,10 @@ regenerator-runtime@^0.11.0:
   version "0.11.1"
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"
 
+regenerator-runtime@^0.12.0:
+  version "0.12.0"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.12.0.tgz#8052ac952d85b10f3425192cd0c53f45cf65c6cb"
+
 regenerator-transform@^0.13.3:
   version "0.13.3"
   resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.13.3.tgz#264bd9ff38a8ce24b06e0636496b2c856b57bcbb"