fix(@ngtools/webpack): only load test helpers on tests

Fix #16858

Author: filipesilva

packages/ngtools/webpack/src/transformers/ast_helpers.ts

@@ -5,11 +5,7 @@
  * Use of this source code is governed by an MIT-style license that can be
  * found in the LICENSE file at https://angular.io/license
  */
-import { virtualFs } from '@angular-devkit/core';
-import { readFileSync, readdirSync } from 'fs';
-import { dirname, join } from 'path';
 import * as ts from 'typescript';
-import { WebpackCompilerHost } from '../compiler_host';
 
 
 // Find all nodes from the AST in the subtree of node of SyntaxKind kind.
@@ -45,129 +41,3 @@ export function getLastNode(sourceFile: ts.SourceFile): ts.Node | null {
 
   return null;
 }
-
-
-// Test transform helpers.
-const basePath = '/project/src/';
-const fileName = basePath + 'test-file.ts';
-const typeScriptLibFiles = loadTypeScriptLibFiles();
-const tsLibFiles = loadTsLibFiles();
-
-export function createTypescriptContext(
-  content: string,
-  additionalFiles?: Record<string, string>,
-  useLibs = false,
-  extraCompilerOptions: ts.CompilerOptions = {},
-) {
-  // Set compiler options.
-  const compilerOptions: ts.CompilerOptions = {
-    noEmitOnError: useLibs,
-    allowJs: true,
-    newLine: ts.NewLineKind.LineFeed,
-    moduleResolution: ts.ModuleResolutionKind.NodeJs,
-    module: ts.ModuleKind.ESNext,
-    target: ts.ScriptTarget.ESNext,
-    skipLibCheck: true,
-    sourceMap: false,
-    importHelpers: true,
-    experimentalDecorators: true,
-    ...extraCompilerOptions,
-  };
-
-  // Create compiler host.
-  const compilerHost = new WebpackCompilerHost(
-    compilerOptions,
-    basePath,
-    new virtualFs.SimpleMemoryHost(),
-    false,
-  );
-
-  // Add a dummy file to host content.
-  compilerHost.writeFile(fileName, content, false);
-
-  if (useLibs) {
-    // Write the default libs.
-    // These are needed for tests that use import(), because it relies on a Promise being there.
-    const compilerLibFolder = dirname(compilerHost.getDefaultLibFileName(compilerOptions));
-    for (const [k, v] of Object.entries(typeScriptLibFiles)) {
-      compilerHost.writeFile(join(compilerLibFolder, k), v, false);
-    }
-  }
-
-  if (compilerOptions.importHelpers) {
-    for (const [k, v] of Object.entries(tsLibFiles)) {
-      compilerHost.writeFile(k, v, false);
-    }
-  }
-
-  if (additionalFiles) {
-    for (const key in additionalFiles) {
-      compilerHost.writeFile(basePath + key, additionalFiles[key], false);
-    }
-  }
-
-  // Create the TypeScript program.
-  const program = ts.createProgram([fileName], compilerOptions, compilerHost);
-
-  return { compilerHost, program };
-}
-
-export function transformTypescript(
-  content: string | undefined,
-  transformers: ts.TransformerFactory<ts.SourceFile>[],
-  program?: ts.Program,
-  compilerHost?: WebpackCompilerHost,
-): string | undefined {
-  // Use given context or create a new one.
-  if (content !== undefined) {
-    const typescriptContext = createTypescriptContext(content);
-    if (!program) {
-      program = typescriptContext.program;
-    }
-    if (!compilerHost) {
-      compilerHost = typescriptContext.compilerHost;
-    }
-  } else if (!program || !compilerHost) {
-    throw new Error('transformTypescript needs either `content` or a `program` and `compilerHost');
-  }
-
-  // Emit.
-  const { emitSkipped, diagnostics } = program.emit(
-    undefined, undefined, undefined, undefined, { before: transformers },
-  );
-
-  // Throw error with diagnostics if emit wasn't successfull.
-  if (emitSkipped) {
-    throw new Error(ts.formatDiagnostics(diagnostics, compilerHost));
-  }
-
-  // Return the transpiled js.
-  return compilerHost.readFile(fileName.replace(/\.tsx?$/, '.js'));
-}
-
-function loadTypeScriptLibFiles(): Record<string, string> {
-  const libFolderPath = dirname(require.resolve('typescript/lib/lib.d.ts'));
-  const libFolderFiles = readdirSync(libFolderPath);
-  const libFileNames = libFolderFiles.filter(f => f.startsWith('lib.') && f.endsWith('.d.ts'));
-
-  // Return a map of the lib names to their content.
-  const libs: Record<string, string> = {};
-  for (const f of libFileNames) {
-    libs[f] = readFileSync(join(libFolderPath, f), 'utf-8');
-  }
-
-  return libs;
-}
-
-function loadTsLibFiles(): Record<string, string> {
-  const libFolderPath = dirname(require.resolve('tslib/package.json'));
-  const libFolderFiles = readdirSync(libFolderPath);
-
-  // Return a map of the lib names to their content.
-  const libs: Record<string, string> = {};
-  for (const f of libFolderFiles) {
-    libs[join('node_modules/tslib', f)] = readFileSync(join(libFolderPath, f), 'utf-8');
-  }
-
-  return libs;
-}

packages/ngtools/webpack/src/transformers/ctor-parameters_spec.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { tags } from '@angular-devkit/core'; // tslint:disable-line:no-implicit-dependencies
-import { createTypescriptContext, transformTypescript } from './ast_helpers';
 import { downlevelConstructorParameters } from './ctor-parameters';
+import { createTypescriptContext, transformTypescript } from './spec_helpers';
 
 function transform(input: string, additionalFiles?: Record<string, string>) {
   const { program, compilerHost } = createTypescriptContext(input, additionalFiles);

packages/ngtools/webpack/src/transformers/elide_imports_spec.ts

@@ -8,9 +8,10 @@
 // tslint:disable:no-big-function
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
 import * as ts from 'typescript';
-import { createTypescriptContext, getLastNode, transformTypescript } from './ast_helpers';
+import { getLastNode } from './ast_helpers';
 import { RemoveNodeOperation } from './interfaces';
 import { makeTransform } from './make_transform';
+import { createTypescriptContext, transformTypescript } from './spec_helpers';
 
 describe('@ngtools/webpack transformers', () => {
   describe('elide_imports', () => {

packages/ngtools/webpack/src/transformers/export_lazy_module_map_spec.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
-import { transformTypescript } from './ast_helpers';
 import { exportLazyModuleMap } from './export_lazy_module_map';
+import { transformTypescript } from './spec_helpers';
 
 describe('@ngtools/webpack transformers', () => {
   describe('export_lazy_module_map', () => {

packages/ngtools/webpack/src/transformers/export_ngfactory_spec.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
-import { transformTypescript } from './ast_helpers';
 import { exportNgFactory } from './export_ngfactory';
+import { transformTypescript } from './spec_helpers';
 
 describe('@ngtools/webpack transformers', () => {
   describe('export_ngfactory', () => {

packages/ngtools/webpack/src/transformers/import_factory_spec.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { tags } from '@angular-devkit/core';
-import { createTypescriptContext, transformTypescript } from './ast_helpers';
 import { importFactory } from './import_factory';
+import { createTypescriptContext, transformTypescript } from './spec_helpers';
 
 describe('@ngtools/webpack transformers', () => {
   describe('import_factory', () => {

packages/ngtools/webpack/src/transformers/multiple_transformers_spec.ts

@@ -6,11 +6,11 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
-import { createTypescriptContext, transformTypescript } from './ast_helpers';
 import { exportLazyModuleMap } from './export_lazy_module_map';
 import { exportNgFactory } from './export_ngfactory';
 import { removeDecorators } from './remove_decorators';
 import { replaceBootstrap } from './replace_bootstrap';
+import { createTypescriptContext, transformTypescript } from './spec_helpers';
 
 
 describe('@ngtools/webpack transformers', () => {

packages/ngtools/webpack/src/transformers/register_locale_data_spec.ts

@@ -6,8 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
-import { transformTypescript } from './ast_helpers';
 import { registerLocaleData } from './register_locale_data';
+import { transformTypescript } from './spec_helpers';
 
 describe('@ngtools/webpack transformers', () => {
   describe('register_locale_data', () => {

packages/ngtools/webpack/src/transformers/remove-ivy-jit-support-calls_spec.ts

@@ -7,8 +7,8 @@
  */
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
 import * as ts from 'typescript';
-import { createTypescriptContext, transformTypescript } from './ast_helpers';
 import { removeIvyJitSupportCalls } from './remove-ivy-jit-support-calls';
+import { createTypescriptContext, transformTypescript } from './spec_helpers';
 
 function transform(
   input: string,

packages/ngtools/webpack/src/transformers/remove_decorators_spec.ts

@@ -7,8 +7,8 @@
  */
 // tslint:disable:no-big-function
 import { tags } from '@angular-devkit/core';  // tslint:disable-line:no-implicit-dependencies
-import { createTypescriptContext, transformTypescript } from './ast_helpers';
 import { removeDecorators } from './remove_decorators';
+import { createTypescriptContext, transformTypescript } from './spec_helpers';
 
 describe('@ngtools/webpack transformers', () => {
   describe('remove_decorators', () => {