fix(web): handle delete-output-path option

Closes #4015

docs/angular/api-web/executors/build.md

@@ -48,6 +48,14 @@ Type: `string`
 
 The crossorigin attribute to use for generated javascript script tags. One of 'none' | 'anonymous' | 'use-credentials'
 
+### deleteOutputPath
+
+Default: `true`
+
+Type: `boolean`
+
+Delete the output path before building.
+
 ### deployUrl
 
 Type: `string`

docs/angular/api-web/executors/package.md

@@ -28,6 +28,14 @@ Possible values: `dependencies`, `peerDependencies`
 
 When updateBuildableProjectDepsInPackageJson is true, this adds dependencies to either `peerDependencies` or `dependencies`
 
+### deleteOutputPath
+
+Default: `true`
+
+Type: `boolean`
+
+Delete the output path before building.
+
 ### entryFile
 
 Type: `string`

docs/node/api-web/executors/build.md

@@ -49,6 +49,14 @@ Type: `string`
 
 The crossorigin attribute to use for generated javascript script tags. One of 'none' | 'anonymous' | 'use-credentials'
 
+### deleteOutputPath
+
+Default: `true`
+
+Type: `boolean`
+
+Delete the output path before building.
+
 ### deployUrl
 
 Type: `string`

docs/node/api-web/executors/package.md

@@ -29,6 +29,14 @@ Possible values: `dependencies`, `peerDependencies`
 
 When updateBuildableProjectDepsInPackageJson is true, this adds dependencies to either `peerDependencies` or `dependencies`
 
+### deleteOutputPath
+
+Default: `true`
+
+Type: `boolean`
+
+Delete the output path before building.
+
 ### entryFile
 
 Type: `string`

docs/react/api-web/executors/build.md

@@ -49,6 +49,14 @@ Type: `string`
 
 The crossorigin attribute to use for generated javascript script tags. One of 'none' | 'anonymous' | 'use-credentials'
 
+### deleteOutputPath
+
+Default: `true`
+
+Type: `boolean`
+
+Delete the output path before building.
+
 ### deployUrl
 
 Type: `string`

docs/react/api-web/executors/package.md

@@ -29,6 +29,14 @@ Possible values: `dependencies`, `peerDependencies`
 
 When updateBuildableProjectDepsInPackageJson is true, this adds dependencies to either `peerDependencies` or `dependencies`
 
+### deleteOutputPath
+
+Default: `true`
+
+Type: `boolean`
+
+Delete the output path before building.
+
 ### entryFile
 
 Type: `string`

e2e/web/src/web.test.ts

@@ -74,6 +74,15 @@ describe('Web Components Applications', () => {
       `dist/libs/${libName}/_should_remove.txt`
     );
     checkFilesExist(`dist/apps/_should_not_remove.txt`);
+
+    // `delete-output-path`
+    createFile(`dist/apps/${appName}/_should_keep.txt`);
+    runCLI(`build ${appName} --delete-output-path=false`);
+    checkFilesExist(`dist/apps/${appName}/_should_keep.txt`);
+
+    createFile(`dist/libs/${libName}/_should_keep.txt`);
+    runCLI(`build ${libName} --delete-output-path=false`);
+    checkFilesExist(`dist/libs/${libName}/_should_keep.txt`);
   }, 120000);
 
   it('should do another build if differential loading is needed', async () => {

packages/web/src/builders/build/build.impl.ts

@@ -56,6 +56,8 @@ export interface WebBuildBuilderOptions extends BuildBuilderOptions {
 
   verbose?: boolean;
   buildLibsFromSource?: boolean;
+
+  deleteOutputPath?: boolean;
 }
 
 export default createBuilder<WebBuildBuilderOptions & JsonObject>(run);
@@ -98,7 +100,9 @@ export function run(options: WebBuildBuilderOptions, context: BuilderContext) {
   }
 
   // Delete output path before bundling
-  deleteOutputDir(context.workspaceRoot, options.outputPath);
+  if (options.deleteOutputPath) {
+    deleteOutputDir(context.workspaceRoot, options.outputPath);
+  }
 
   return from(getSourceRoot(context))
     .pipe(

packages/web/src/builders/build/schema.json

@@ -19,6 +19,11 @@
       "type": "string",
       "description": "The output path of the generated files."
     },
+    "deleteOutputPath": {
+      "type": "boolean",
+      "description": "Delete the output path before building.",
+      "default": true
+    },
     "watch": {
       "type": "boolean",
       "description": "Enable re-building when files change.",

packages/web/src/builders/package/package.impl.ts

@@ -124,7 +124,9 @@ export function run(
         context.logger.info(`Bundling ${context.target.project}...`);
 
         // Delete output path before bundling
-        deleteOutputDir(context.workspaceRoot, options.outputPath);
+        if (options.deleteOutputPath) {
+          deleteOutputDir(context.workspaceRoot, options.outputPath);
+        }
 
         return from(rollupOptions).pipe(
           concatMap((opts) =>

packages/web/src/builders/package/schema.json

@@ -15,6 +15,11 @@
       "type": "string",
       "description": "The output path of the generated files."
     },
+    "deleteOutputPath": {
+      "type": "boolean",
+      "description": "Delete the output path before building.",
+      "default": true
+    },
     "tsConfig": {
       "type": "string",
       "description": "The path to tsconfig file."

packages/web/src/utils/types.ts

@@ -60,6 +60,7 @@ export interface PackageBuilderOptions {
   updateBuildableProjectDepsInPackageJson?: boolean;
   buildableProjectDepsInPackageJsonType?: 'dependencies' | 'peerDependencies';
   umdName?: string;
+  deleteOutputPath?: boolean;
 }
 
 export interface AssetGlobPattern extends JsonObject {