Allow Babel 8, setup GH actions

.github/workflows/test.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    name: Node.js ${{ matrix.node }} / Babel ${{ matrix.babel }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        node: [8, 22, 24, 26]
+        babel: [7, 8]
+        exclude:
+          # Babel 8 requires Node.js 20+, so it cannot run on Node.js 8.
+          - node: 8
+            babel: 8
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Node.js ${{ matrix.node }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node }}
+
+      - name: Install dependencies (Babel 7)
+        run: yarn install --frozen-lockfile
+
+      - name: Upgrade dev dependencies to Babel 8
+        if: matrix.babel == 8
+        run: >-
+          yarn add --dev
+          @babel/core@^8.0.0
+          @babel/plugin-transform-arrow-functions@^8.0.0
+          @babel/plugin-transform-block-scoping@^8.0.0
+          @babel/plugin-transform-classes@^8.0.0
+
+      - name: Run tests
+        run: yarn test

index.js

@@ -25,7 +25,7 @@ module.exports = function (opts) {
 		}
 
 		if (!supportsCallerOption()) {
-			cb(new PluginError('gulp-babel', '@babel/core@^7.0.0 is required'));
+			cb(new PluginError('gulp-babel', '@babel/core@>=7.0.0 is required'));
 			return;
 		}
 
@@ -75,7 +75,7 @@ function supportsCallerOption() {
 		try {
 			// Rather than try to match the Babel version, we just see if it throws
 			// when passed a 'caller' flag, and use that to decide if it is supported.
-			babel.loadPartialConfig({
+			(babel.loadPartialConfigSync || babel.loadPartialConfig)({
 				caller: undefined,
 				babelrc: false,
 				configFile: false

package.json

@@ -12,7 +12,7 @@
     "node": ">=6"
   },
   "scripts": {
-    "test": "xo && mocha"
+    "test": "mocha"
   },
   "pre-commit": {
     "run": [
@@ -44,7 +44,7 @@
     "vinyl-sourcemaps-apply": "^0.2.0"
   },
   "peerDependencies": {
-    "@babel/core": "^7.0.0"
+    "@babel/core": "^7.0.0 || ^8.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.0.0",
@@ -54,13 +54,6 @@
     "gulp-sourcemaps": "^2.6.4",
     "mocha": "^6.2.1",
     "pre-commit": "^1.2.2",
-    "vinyl": "^2.1.0",
-    "xo": "^0.25.3"
-  },
-  "xo": {
-    "envs": [
-      "node",
-      "mocha"
-    ]
+    "vinyl": "^2.1.0"
   }
 }