Allow require() of runtime helpers in Node.js 13.2-13.6

.github/workflows/ci.yml

@@ -326,18 +326,18 @@ jobs:
           node-version: "13.0" # quoted, otherwise it's just 13
       - name: Test Node.js 13.0
         run: yarn test:runtime:node
-      # - name: Use Node.js 13.2
-      #   uses: actions/setup-node@v2-beta
-      #   with:
-      #     node-version: 13.2
-      # - name: Test Node.js 13.2
-      #   run: yarn test:runtime:node
-      # - name: Use Node.js 13.6
-      #   uses: actions/setup-node@v2-beta
-      #   with:
-      #     node-version: 13.6
-      # - name: Test Node.js 13.6
-      #   run: yarn test:runtime:node
+      - name: Use Node.js 13.2
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: 13.2
+      - name: Test Node.js 13.2
+        run: yarn test:runtime:node
+      - name: Use Node.js 13.6
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: 13.6
+      - name: Test Node.js 13.6
+        run: yarn test:runtime:node
       - name: Use Node.js 13.7
         uses: actions/setup-node@v2-beta
         with:

packages/babel-plugin-transform-runtime/scripts/build-dist.js

@@ -159,13 +159,16 @@ function writeHelpers(runtimeName, { corejs } = {}) {
     // - Node.js >=13.7.0 and bundlers will succesfully load the first
     //   array entry:
     //    * Node.js will always load the CJS file
-    //    * Bundlers when using require() will load the CJS file
-    //    * Everything else will load the ESM file
-    // - Node.js <13.7.0 will fail resolving the first array entry, and will
+    //    * Modern tools when using "import" will load the ESM file
+    //    * Everything else (old tools, or requrie() in tools) will
+    //      load the CJS file
+    // - Node.js 13.2-13.7 will ignore the "node" and "import" conditions,
+    //   will fallback to "default" and load the CJS file
+    // - Node.js <13.2.0 will fail resolving the first array entry, and will
     //   fallback to the second entry (the CJS file)
     // In Babel 8 we can simplify this.
     helperSubExports[`./${helperPath}`] = [
-      { node: cjs, require: cjs, default: esm },
+      { node: cjs, import: esm, default: cjs },
       cjs,
     ];
     // For backward compatibility. We can remove this in Babel 8.