Move legacy node version tests to GitHub actions

.github/workflows/ci.yml

@@ -0,0 +1,42 @@
+name: Node CI
+
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Use Node.js latest
+        uses: actions/setup-node@v2-beta
+      - name: Generate coverage report
+        run: |
+          make -j test-ci-coverage
+      - name: Upload coverage report
+        uses: codecov/codecov-action@v1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+  legacy-node-version-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [6.x, 8.x]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Use Node.js latest
+        uses: actions/setup-node@v2-beta # Build Babel on latest node versions
+      - name: Build
+        run: |
+          BABEL_ENV=test-legacy make -j bootstrap
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v2-beta
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: Test on node.js ${{ matrix.node-version }}
+        # Hack: --color has supports-color@5 returned true for GitHub CI
+        # Remove once `chalk` is bumped to 4.0.
+        run: |
+          BABEL_ENV=test node ./node_modules/.bin/jest --ci --color

.travis.yml

@@ -41,10 +41,9 @@ matrix:
         directories:
           - $HOME/AppData/Local/Temp/chocolatey
     # Continue node_js matrix
-    - node_js: "6"
     - node_js: "12"
     - node_js: "10"
-    - node_js: "8"
+    # Node.js 6 and 8 are tested on GitHub versions
     - node_js: "node"
       env: JOB=babel-parser-flow-tests
     - node_js: "node"

babel.config.js

@@ -17,7 +17,8 @@ module.exports = function (api) {
   };
   const envOpts = Object.assign({}, envOptsNoTargets);
 
-  const compileDynamicImport = env === "test" || env === "development";
+  const compileDynamicImport =
+    env === "test" || env === "development" || env === "test-legacy";
 
   let convertESM = true;
   let ignoreLib = true;
@@ -55,6 +56,7 @@ module.exports = function (api) {
       );
       if (env === "rollup") envOpts.targets = { node: nodeVersion };
       break;
+    case "test-legacy": // In test-legacy environment, we build babel on latest node but test on minimum supported legacy versions
     case "production":
       // Config during builds before publish.
       envOpts.targets = {
@@ -169,9 +171,9 @@ module.exports = function (api) {
 // the original absolute path.
 // NOTE: This plugin must run before @babel/plugin-transform-modules-commonjs,
 // and assumes that the target is the current node version.
-function dynamicImportUrlToPath({ template }) {
-  const currentNodeSupportsURL = !!require("url").pathToFileURL;
-
+function dynamicImportUrlToPath({ template, env }) {
+  const currentNodeSupportsURL =
+    !!require("url").pathToFileURL && env() !== "test-legacy"; // test-legacy is run on legacy node versions without pathToFileURL support
   if (currentNodeSupportsURL) {
     return {
       visitor: {