feat(@ngtools/webpack): allow custom lazy module resource

packages/ngtools/webpack/src/angular_compiler_plugin.ts

@@ -102,6 +102,7 @@ export interface AngularCompilerPluginOptions {
   missingTranslation?: string;
   platform?: PLATFORM;
   nameLazyFiles?: boolean;
+  lazyModulesResource?: string;
   logger?: logging.Logger;
 
   // added to the list of lazy routes
@@ -123,6 +124,15 @@ export enum PLATFORM {
   Server,
 }
 
+// APFv6 does not have single FESM anymore. Instead of verifying if we're pointing to
+// FESMs, we resolve the `@angular/core` path and verify that the path for the
+// module starts with it.
+// This may be slower but it will be compatible with both APF5, 6 and potential future
+// versions (until the dynamic import appears outside of core I suppose).
+// We resolve any symbolic links in order to get the real path that would be used in webpack.
+const angularCorePackagePath = require.resolve('@angular/core/package.json');
+const angularCoreResourceRoot = fs.realpathSync(path.dirname(angularCorePackagePath));
+
 export class AngularCompilerPlugin {
   private _options: AngularCompilerPluginOptions;
 
@@ -690,20 +700,16 @@ export class AngularCompilerPlugin {
 
     // Add lazy modules to the context module for @angular/core
     compiler.hooks.contextModuleFactory.tap('angular-compiler', cmf => {
-      const angularCorePackagePath = require.resolve('@angular/core/package.json');
-
-      // APFv6 does not have single FESM anymore. Instead of verifying if we're pointing to
-      // FESMs, we resolve the `@angular/core` path and verify that the path for the
-      // module starts with it.
-
-      // This may be slower but it will be compatible with both APF5, 6 and potential future
-      // versions (until the dynamic import appears outside of core I suppose).
-      // We resolve any symbolic links in order to get the real path that would be used in webpack.
-      const angularCoreDirname = fs.realpathSync(path.dirname(angularCorePackagePath));
-
       cmf.hooks.afterResolve.tapPromise('angular-compiler', async result => {
-        // Alter only request from Angular.
-        if (!result || !this.done || !result.resource.startsWith(angularCoreDirname)) {
+        // Alter only existing request from Angular or one of the additional lazyModulesResources.
+        const isLazyModuleResource = (resource: string) => {
+          if (this.options.lazyModulesResource) {
+            return resource === this.options.lazyModulesResource;
+          } else {
+            return resource.startsWith(angularCoreResourceRoot);
+          }
+        };
+        if (!result || !this.done || !isLazyModuleResource(result.resource)) {
           return result;
         }