@ngtools+webpack+7.3.8.patch

diff --git a/node_modules/@ngtools/webpack/src/compiler_host.js b/node_modules/@ngtools/webpack/src/compiler_host.js
index f00b749..d146404 100644
--- a/node_modules/@ngtools/webpack/src/compiler_host.js
+++ b/node_modules/@ngtools/webpack/src/compiler_host.js
@@ -10,6 +10,7 @@ Object.defineProperty(exports, "__esModule", { value: true });
 const core_1 = require("@angular-devkit/core");
 const fs_1 = require("fs");
 const ts = require("typescript");
+const FilePreprocessor = require("file-preprocessor").FilePreprocessor;
 const dev = Math.floor(Math.random() * 10000);
 class WebpackCompilerHost {
     constructor(_options, basePath, host, cacheSourceFiles, directTemplateLoading = false) {
@@ -218,8 +219,10 @@ class WebpackCompilerHost {
             if (cached) {
                 return cached;
             }
-            const content = this.readFile(fileName);
+            let content = this.readFile(fileName);
             if (content !== undefined) {
+                let fp = new FilePreprocessor({prefix: '//#'});
+                content = fp.processString(content);                
                 const sf = ts.createSourceFile(workaroundResolve(fileName), content, languageVersion, true);
                 if (this.cacheSourceFiles) {
                     this._sourceFileCache.set(p, sf);