fix(@ngtools/webpack): resolve all file requests with the virtual fs

fixes #885

Author: sis0k0

packages/ngtools/webpack/src/compiler_host.ts

@@ -232,12 +232,11 @@ export class WebpackCompilerHost implements ts.CompilerHost {
     return stats.content;
   }
 
-  // Does not delegate, use with `fileExists/directoryExists()`.
-  stat(path: string): VirtualStats {
+  stat(path: string): VirtualStats | null {
     const p = this.resolve(path);
     const stats = this._files[p] || this._directories[p];
     if (!stats) {
-      throw new Error(`File not found: ${JSON.stringify(p)}`);
+      return this._syncHost.stat(p) as VirtualStats | null;
     }
 
     return stats;

packages/ngtools/webpack/src/virtual_file_system_decorator.ts

@@ -18,17 +18,16 @@ export class VirtualFileSystemDecorator implements InputFileSystem {
     private _webpackCompilerHost: WebpackCompilerHost,
   ) { }
 
-  // We only need to intercept calls to individual files that are present in WebpackCompilerHost.
   private _readFileSync(path: string): string | null {
-    if (this._webpackCompilerHost.fileExists(path, false)) {
+    if (this._webpackCompilerHost.fileExists(path)) {
       return this._webpackCompilerHost.readFile(path) || null;
     }
 
     return null;
   }
 
   private _statSync(path: string): Stats | null {
-    if (this._webpackCompilerHost.fileExists(path, false)) {
+    if (this._webpackCompilerHost.fileExists(path)) {
       return this._webpackCompilerHost.stat(path);
     }