webpack v5 compatibility (#2641)

* WIP webpack v5 migration

* Linting

* WIP again

* Linting

* Remove all: false

* webpack dep bump

* InjectManifest remediation

* Linting.

* Require 4.40

* Still WIP

* WIP

* Redo the asset/chunk mapping

* Fixed some test cases

* Another test fix

* Get assets from child compilations

* Tests pass

* Re-arranged some thing.

* Re-arranging things

* Good webpack v4/v5 testing setup

* Review feedback

gulp-tasks/test-node.js

@@ -56,7 +56,14 @@ async function runNodeTestsWithEnv(testGroup, nodeEnv) {
 
   const packagesToTest = glob.sync(`test/${testGroup}/node`, globConfig);
   for (const packageToTest of packagesToTest) {
-    await runNodeTestSuite(packageToTest, nodeEnv);
+    // Hardcode special logic for webpack v4 and v5 tests, which need to
+    // be run in separate processes.
+    if (packageToTest.includes('workbox-webpack-plugin')) {
+      await runNodeTestSuite(`${packageToTest}/v4`, nodeEnv);
+      await runNodeTestSuite(`${packageToTest}/v5`, nodeEnv);
+    } else {
+      await runNodeTestSuite(packageToTest, nodeEnv);
+    }
   }
 }
 

infra/testing/webpack-build-check.js

@@ -6,6 +6,13 @@
   https://opensource.org/licenses/MIT.
 */
 
+function joinMessages(errorsOrWarnings) {
+  if ('message' in errorsOrWarnings[0]) {
+    return errorsOrWarnings.map((item) => item.message).join('\n');
+  } else {
+    return errorsOrWarnings.join('\n');
+  }
+}
 
 module.exports = (webpackError, stats) => {
   if (webpackError) {
@@ -15,10 +22,10 @@ module.exports = (webpackError, stats) => {
   const statsJson = stats.toJson('verbose');
 
   if (statsJson.errors.length > 0) {
-    throw new Error(statsJson.errors.join('\n'));
+    throw new Error(joinMessages(statsJson.errors));
   }
 
   if (statsJson.warnings.length > 0) {
-    throw new Error(statsJson.warnings.join('\n'));
+    throw new Error(joinMessages(statsJson.warnings));
   }
 };

package.json

@@ -47,6 +47,7 @@
     "@rollup/plugin-multi-entry": "^4.0.0",
     "@rollup/plugin-node-resolve": "^9.0.0",
     "@rollup/plugin-replace": "^2.3.3",
+    "@types/estree": "0.0.45",
     "@typescript-eslint/eslint-plugin": "^2.30.0",
     "@typescript-eslint/parser": "^2.30.0",
     "acorn": "^8.0.1",
@@ -76,14 +77,15 @@
     "globby": "^11.0.1",
     "gulp": "^4.0.2",
     "gzip-size": "^5.1.1",
-    "html-webpack-plugin": "^4.3.0",
+    "html-webpack-plugin": "^4.5.0",
     "husky": "^4.2.5",
     "jsdoc": "^3.6.5",
     "jsdoc-baseline": "^0.1.5",
     "lerna": "^3.22.1",
     "memory-fs": "^0.5.0",
     "minimist": "^1.2.5",
     "mocha": "^8.1.1",
+    "module-alias": "^2.2.2",
     "nunjucks": "^3.2.2",
     "nyc": "^15.1.0",
     "proxyquire": "^2.1.3",
@@ -99,7 +101,8 @@
     "tempy": "^0.6.0",
     "typescript": "^3.9.7",
     "upath": "^1.2.0",
-    "webpack": "^4.44.1",
+    "webpack-v4": "npm:webpack@^4.44.2",
+    "webpack-v5": "npm:webpack@^5.0.0",
     "worker-plugin": "^5.0.0"
   }
 }