Tests and improvements to babel config invalidation

package.json

@@ -32,7 +32,7 @@
     "release": "lerna publish -y from-package --dist-tag=next --no-git-tag-version --no-push"
   },
   "devDependencies": {
-    "@babel/core": "^7.8.7",
+    "@babel/core": "^7.12.0",
     "cross-env": "^7.0.0",
     "doctoc": "^1.4.0",
     "eslint": "^6.0.0",

packages/core/core/src/ParcelConfig.schema.js

@@ -110,9 +110,7 @@ export default {
     },
     bundler: {
       type: 'string',
-      __validate: (validatePluginName('bundler', 'bundler'): (
-        val: string,
-      ) => void),
+      __validate: (validatePluginName('bundler', 'bundler'): string => void),
     },
     resolvers: (pipelineSchema('resolver', 'resolvers'): SchemaEntity),
     transformers: (mapPipelineSchema(

packages/core/core/src/worker.js

@@ -150,3 +150,24 @@ export async function runPackage(
     runner.getBundleInfo(bundle, bundleGraph, cacheKeys, configs)
   );
 }
+
+const PKG_RE = /node_modules[/\\]((?:@[^/\\]+\/[^/\\]+)|[^/\\]+)(?!.*[/\\]node_modules[/\\])/;
+export function invalidateRequireCache(workerApi: WorkerApi, file: string) {
+  if (process.env.PARCEL_BUILD_ENV === 'test') {
+    // Delete this module and all children in the same node_modules folder
+    let module = require.cache[file];
+    if (module) {
+      delete require.cache[file];
+
+      let pkg = file.match(PKG_RE)?.[1];
+      for (let child of module.children) {
+        if (pkg === child.id.match(PKG_RE)?.[1]) {
+          invalidateRequireCache(workerApi, child.id);
+        }
+      }
+    }
+    return;
+  }
+
+  throw new Error('invalidateRequireCache is only for tests');
+}

packages/core/integration-tests/package.json

@@ -12,7 +12,7 @@
     "test-ci": "yarn test --reporter mocha-multi-reporters --reporter-options configFile=./test/mochareporters.json"
   },
   "devDependencies": {
-    "@babel/core": "^7.4.4",
+    "@babel/core": "^7.12.0",
     "@babel/plugin-syntax-export-default-from": "^7.2.0",
     "@babel/plugin-syntax-export-namespace-from": "^7.2.0",
     "@babel/plugin-syntax-module-attributes": "^7.10.4",