feat(@angular-devkit/build-ng-packagr): permit to set a custom TsConfig file

.gitignore

@@ -16,6 +16,7 @@ node_modules/
 tmp/
 npm-debug.log*
 yarn-error.log*
+.ng_pkg_build/
 
 # Mac OSX Finder files.
 **/.DS_Store

packages/angular_devkit/build_ng_packagr/src/build/index.ts

@@ -27,6 +27,7 @@ function requireProjectModule(root: string, moduleName: string) {
 
 export interface NgPackagrBuilderOptions {
   project: string;
+  tsConfig?: string;
 }
 
 export class NgPackagrBuilder implements Builder<NgPackagrBuilderOptions> {
@@ -46,9 +47,15 @@ export class NgPackagrBuilder implements Builder<NgPackagrBuilderOptions> {
         getSystemPath(root), 'ng-packagr') as typeof ngPackagr;
       const packageJsonPath = getSystemPath(resolve(root, normalize(options.project)));
 
-      projectNgPackagr.ngPackagr()
-        .forProject(packageJsonPath)
-        .build()
+      const ngPkgProject = projectNgPackagr.ngPackagr()
+        .forProject(packageJsonPath);
+
+      if (options.tsConfig) {
+        const tsConfigPath = getSystemPath(resolve(root, normalize(options.tsConfig)));
+        ngPkgProject.withTsConfig(tsConfigPath);
+      }
+
+      ngPkgProject.build()
         .then(() => {
           obs.next({ success: true });
           obs.complete();

packages/angular_devkit/build_ng_packagr/src/build/schema.json

@@ -6,6 +6,10 @@
     "project": {
       "type": "string",
       "description": "The file path of the package.json for distribution via npm."
+    },
+    "tsConfig": {
+      "type": "string",
+      "description": "The file path of the TypeScript configuration file."
     }
   },
   "additionalProperties": false,

tests/@angular_devkit/build_ng_packagr/ng-packaged/angular.json

@@ -9,7 +9,8 @@
         "build": {
           "builder": "../../../../packages/angular_devkit/build_ng_packagr:build",
           "options": {
-            "project": "projects/lib/ng-package.json"
+            "project": "projects/lib/ng-package.json",
+            "tsConfig": "projects/lib/tsconfig.lib.json"
           }
         },
         "test": {

tests/@angular_devkit/build_ng_packagr/ng-packaged/projects/lib/src/lib/lib.service.ts

@@ -5,4 +5,8 @@ export class LibService {
 
   constructor() { }
 
+  testEs2016() {
+    return ['foo', 'bar'].includes('foo');
+  }
+
 }

tests/@angular_devkit/build_ng_packagr/ng-packaged/projects/lib/tsconfig.lib.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "es6",
+    "moduleResolution": "node",
+    "sourceMap": true,
+    "inlineSources": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "importHelpers": true,
+    "lib": ["dom", "es2016"]
+  }
+}