.

Author: clydin

packages/ngtools/webpack/src/angular_compiler_plugin.ts

@@ -582,19 +582,18 @@ export class AngularCompilerPlugin {
   // Registration hook for webpack plugin.
   // tslint:disable-next-line:no-big-function
   apply(compiler: Compiler & { watchMode?: boolean }) {
-    // only present for webpack 4.23.0+, assume true otherwise
-    const watchMode = compiler.watchMode === undefined ? true : compiler.watchMode;
-
     // cleanup if not watching
-    if (!watchMode) {
-      compiler.hooks.thisCompilation.tap('angular-compiler', compilation => {
-        compilation.hooks.finishModules.tap('angular-compiler', () => {
+    compiler.hooks.thisCompilation.tap('angular-compiler', compilation => {
+      compilation.hooks.finishModules.tap('angular-compiler', () => {
+        // only present for webpack 4.23.0+, assume true otherwise
+        const watchMode = compiler.watchMode === undefined ? true : compiler.watchMode;
+        if (!watchMode) {
           this._program = null;
           this._transformers = [];
           this._resourceLoader = undefined;
-        });
+        }
       });
-    }
+    });
 
     // Decorate inputFileSystem to serve contents of CompilerHost.
     // Use decorated inputFileSystem in watchFileSystem.
@@ -634,6 +633,9 @@ export class AngularCompilerPlugin {
         }
       }
 
+      // only present for webpack 4.23.0+, assume true otherwise
+      const watchMode = compiler.watchMode === undefined ? true : compiler.watchMode;
+
       // Create the webpack compiler host.
       const webpackCompilerHost = new WebpackCompilerHost(
         this._compilerOptions,