fix: support using preserveWatchOutput from tsconfig file

Author: micalevisk

actions/build.action.ts

@@ -232,12 +232,12 @@ export class BuildAction extends AbstractAction {
       const isPreserveWatchOutputEnabled = options.find(
         (option) =>
           option.name === 'preserveWatchOutput' && option.value === true,
-      );
+      )?.value as boolean | undefined;
       watchCompiler.run(
         configuration,
         pathToTsconfig,
         appName,
-        { preserveWatchOutput: !!isPreserveWatchOutputEnabled },
+        { preserveWatchOutput: isPreserveWatchOutputEnabled },
         onSuccess,
       );
     } else {

lib/compiler/watch-compiler.ts

@@ -16,7 +16,11 @@ import {
 import { TypeScriptBinaryLoader } from './typescript-loader';
 
 type TypescriptWatchCompilerExtras = {
-  preserveWatchOutput: boolean;
+  /**
+   * If `undefined`, the value of 'preserveWatchOutput' option from tsconfig
+   * file will be used instead.
+   */
+  preserveWatchOutput: boolean | undefined;
 };
 
 export class WatchCompiler extends BaseCompiler<TypescriptWatchCompilerExtras> {
@@ -60,7 +64,8 @@ export class WatchCompiler extends BaseCompiler<TypescriptWatchCompilerExtras> {
       configPath,
       {
         ...options,
-        preserveWatchOutput: extras.preserveWatchOutput,
+        preserveWatchOutput:
+          extras.preserveWatchOutput ?? options.preserveWatchOutput,
       },
       tsBin.sys,
       createProgram,