fix(common): update TS module resolution flow

This commit updates the implementation for resolving `.ts` files.
Instead of registering the `ts-node` project only once, we now refrain from
doing so since there might be multiple projects with different configurations.
The current approach involves dynamically switching the implementation for
registering and unregistering the project after the `.ts` file has been transpiled
and resolved. This change addresses an issue where warnings were encountered when
`ts-node` attempted to register with different configurations. The number of configurations
is no longer a concern, as each time we need to read a `.ts` file, a new TS project is
registered. This adjustment does not impact performance or other attributes because `ts-node`
allows native project disabling. Part of the implementation has been adapted from what Nrwl Nx
already has; we can find their implementation here:
https://github.com/nrwl/nx/blob/master/packages/nx/src/plugins/js/utils/register.ts
It's worth noting that their implementation is somewhat versatile, as it also supports SWC.

Closes: #1197
Closes: #1213

examples/custom-webpack/sanity-app-esm/custom-webpack.config.ts

@@ -1,7 +1,14 @@
 import type { Configuration } from 'webpack';
 
+import { WebpackEsmPlugin } from 'webpack-esm-plugin';
+
 export default async (cfg: Configuration) => {
   const { default: configFromEsm } = await import('./custom-webpack.config.js');
+
+  // This is used to ensure we fixed the following issue:
+  // https://github.com/just-jeb/angular-builders/issues/1213
+  cfg.plugins!.push(new WebpackEsmPlugin());
+
   // Do some stuff with config and configFromEsm
   return { ...cfg, ...configFromEsm };
 };

examples/custom-webpack/sanity-app-esm/package.json

@@ -44,6 +44,7 @@
     "karma-jasmine": "5.1.0",
     "karma-jasmine-html-reporter": "2.1.0",
     "puppeteer": "21.10.0",
-    "typescript": "5.3.3"
+    "typescript": "5.3.3",
+    "webpack-esm-plugin": "file:./webpack-esm-plugin"
   }
 }

examples/custom-webpack/sanity-app-esm/webpack-esm-plugin/package.json

@@ -0,0 +1,17 @@
+{
+  "name": "webpack-esm-plugin",
+  "version": "0.0.1",
+  "module": "./webpack-esm-plugin.mjs",
+  "typings": "./webpack-esm-plugin.d.ts",
+  "exports": {
+    "./package.json": {
+      "default": "./package.json"
+    },
+    ".": {
+      "types": "./webpack-esm-plugin.d.ts",
+      "node": "./webpack-esm-plugin.mjs",
+      "default": "./webpack-esm-plugin.mjs"
+    }
+  },
+  "sideEffects": false
+}

examples/custom-webpack/sanity-app-esm/webpack-esm-plugin/webpack-esm-plugin.d.ts

@@ -0,0 +1,5 @@
+import * as webpack from 'webpack';
+
+export declare class WebpackEsmPlugin {
+  apply(compiler: webpack.Compiler): void;
+}

examples/custom-webpack/sanity-app-esm/webpack-esm-plugin/webpack-esm-plugin.mjs

@@ -0,0 +1,7 @@
+class WebpackEsmPlugin {
+  apply(compiler) {
+    console.error('hello from the WebpackEsmPlugin');
+  }
+}
+
+export { WebpackEsmPlugin };

packages/common/package.json

@@ -20,7 +20,6 @@
     "clean": "rimraf dist"
   },
   "dependencies": {
-    "@angular-devkit/core": "^17.1.0",
     "ts-node": "^10.0.0",
     "tsconfig-paths": "^4.1.0"
   },

packages/common/src/load-module.ts

@@ -1,57 +1,7 @@
 import * as path from 'node:path';
 import * as url from 'node:url';
-import type { logging } from '@angular-devkit/core';
 
-const _tsNodeRegister = (() => {
-  let lastTsConfig: string | undefined;
-  return (tsConfig: string, logger: logging.LoggerApi) => {
-    // Check if the function was previously called with the same tsconfig
-    if (lastTsConfig && lastTsConfig !== tsConfig) {
-      logger.warn(`Trying to register ts-node again with a different tsconfig - skipping the registration.
-                   tsconfig 1: ${lastTsConfig}
-                   tsconfig 2: ${tsConfig}`);
-    }
-
-    if (lastTsConfig) {
-      return;
-    }
-
-    lastTsConfig = tsConfig;
-
-    loadTsNode().register({
-      project: tsConfig,
-      compilerOptions: {
-        module: 'CommonJS',
-        types: [
-          'node', // NOTE: `node` is added because users scripts can also use pure node's packages as webpack or others
-        ],
-      },
-    });
-
-    const tsConfigPaths = loadTsConfigPaths();
-    const result = tsConfigPaths.loadConfig(tsConfig);
-    // The `loadConfig` returns a `ConfigLoaderResult` which must be guarded with
-    // the `resultType` check.
-    if (result.resultType === 'success') {
-      const { absoluteBaseUrl: baseUrl, paths } = result;
-      if (baseUrl && paths) {
-        tsConfigPaths.register({ baseUrl, paths });
-      }
-    }
-  };
-})();
-
-/**
- * check for TS node registration
- * @param file: file name or file directory are allowed
- * @todo tsNodeRegistration: require ts-node if file extension is TypeScript
- */
-function tsNodeRegister(file: string = '', tsConfig: string, logger: logging.LoggerApi) {
-  if (file?.endsWith('.ts')) {
-    // Register TS compiler lazily
-    _tsNodeRegister(tsConfig, logger);
-  }
-}
+import { registerTsProject } from './register-ts-project';
 
 /**
  * This uses a dynamic import to load a module which may be ESM.
@@ -72,22 +22,20 @@ function loadEsmModule<T>(modulePath: string | URL): Promise<T> {
 /**
  * Loads CJS and ESM modules based on extension
  */
-export async function loadModule<T>(
-  modulePath: string,
-  tsConfig: string,
-  logger: logging.LoggerApi
-): Promise<T> {
-  tsNodeRegister(modulePath, tsConfig, logger);
-
+export async function loadModule<T>(modulePath: string, tsConfig: string): Promise<T> {
   switch (path.extname(modulePath)) {
     case '.mjs':
       // Load the ESM configuration file using the TypeScript dynamic import workaround.
       // Once TypeScript provides support for keeping the dynamic import this workaround can be
       // changed to a direct dynamic import.
       return (await loadEsmModule<{ default: T }>(url.pathToFileURL(modulePath))).default;
+
     case '.cjs':
       return require(modulePath);
+
     case '.ts':
+      const unregisterTsProject = registerTsProject(tsConfig);
+
       try {
         // If it's a TS file then there are 2 cases for exporing an object.
         // The first one is `export blah`, transpiled into `module.exports = { blah} `.
@@ -101,7 +49,10 @@ export async function loadModule<T>(
           return (await loadEsmModule<{ default: T }>(url.pathToFileURL(modulePath))).default;
         }
         throw e;
+      } finally {
+        unregisterTsProject();
       }
+
     //.js
     default:
       // The file could be either CommonJS or ESM.
@@ -120,19 +71,3 @@ export async function loadModule<T>(
       }
   }
 }
-
-/**
- * Loads `ts-node` lazily. Moved to a separate function to declare
- * a return type, more readable than an inline variant.
- */
-function loadTsNode(): typeof import('ts-node') {
-  return require('ts-node');
-}
-
-/**
- * Loads `tsconfig-paths` lazily. Moved to a separate function to declare
- * a return type, more readable than an inline variant.
- */
-function loadTsConfigPaths(): typeof import('tsconfig-paths') {
-  return require('tsconfig-paths');
-}

packages/common/src/register-ts-project.ts

@@ -0,0 +1,87 @@
+import * as path from 'node:path';
+import type { CompilerOptions } from 'typescript';
+
+let ts: typeof import('typescript');
+let isTsEsmLoaderRegistered = false;
+
+export function registerTsProject(tsConfig: string) {
+  const cleanupFunctions = [registerTsConfigPaths(tsConfig), registerTsNodeService(tsConfig)];
+
+  // Add ESM support for `.ts` files.
+  // NOTE: There is no cleanup function for this, as it's not possible to unregister the loader.
+  //       Based on limited testing, it doesn't seem to matter if we register it multiple times, but just in
+  //       case let's keep a flag to prevent it.
+  if (!isTsEsmLoaderRegistered) {
+    const module = require('node:module');
+    if (module.register && packageIsInstalled('ts-node/esm')) {
+      const url = require('node:url');
+      module.register(url.pathToFileURL(require.resolve('ts-node/esm')));
+    }
+    isTsEsmLoaderRegistered = true;
+  }
+
+  return () => {
+    cleanupFunctions.forEach(fn => fn());
+  };
+}
+
+function registerTsNodeService(tsConfig: string): VoidFunction {
+  const { register } = require('ts-node') as typeof import('ts-node');
+
+  const service = register({
+    project: tsConfig,
+    compilerOptions: {
+      module: 'CommonJS',
+      types: [
+        'node', // NOTE: `node` is added because users scripts can also use pure node's packages as webpack or others
+      ],
+    },
+  });
+
+  return () => {
+    service.enabled(false);
+  };
+}
+
+function registerTsConfigPaths(tsConfig: string): VoidFunction {
+  const tsConfigPaths = require('tsconfig-paths') as typeof import('tsconfig-paths');
+  const result = tsConfigPaths.loadConfig(tsConfig);
+  if (result.resultType === 'success') {
+    const { absoluteBaseUrl: baseUrl, paths } = result;
+    if (baseUrl && paths) {
+      // Returns a function to undo paths registration.
+      return tsConfigPaths.register({ baseUrl, paths });
+    }
+  }
+
+  // We cannot return anything here if paths failed to be registered.
+  // Additionally, I don't think we should perform any logging in this
+  // context, considering that this is internal information not exposed
+  // to the end user
+  return () => {};
+}
+
+function packageIsInstalled(m: string): boolean {
+  try {
+    require.resolve(m);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+function readCompilerOptions(tsConfig: string): CompilerOptions {
+  ts ??= require('typescript');
+
+  const jsonContent = ts.readConfigFile(tsConfig, ts.sys.readFile);
+  const { options } = ts.parseJsonConfigFileContent(
+    jsonContent.config,
+    ts.sys,
+    path.dirname(tsConfig)
+  );
+
+  // This property is returned in compiler options for some reason, but not part of the typings.
+  // ts-node fails on unknown props, so we have to remove it.
+  delete options.configFilePath;
+  return options;
+}

packages/custom-esbuild/src/application/index.ts

@@ -17,14 +17,10 @@ export function buildCustomEsbuildApplication(
   const tsConfig = path.join(workspaceRoot, options.tsConfig);
 
   return defer(async () => {
-    const codePlugins = await loadPlugins(options.plugins, workspaceRoot, tsConfig, context.logger);
+    const codePlugins = await loadPlugins(options.plugins, workspaceRoot, tsConfig);
 
     const indexHtmlTransformer = options.indexHtmlTransformer
-      ? await loadModule(
-          path.join(workspaceRoot, options.indexHtmlTransformer),
-          tsConfig,
-          context.logger
-        )
+      ? await loadModule(path.join(workspaceRoot, options.indexHtmlTransformer), tsConfig)
       : undefined;
 
     return { codePlugins, indexHtmlTransformer } as ApplicationBuilderExtensions;

packages/custom-esbuild/src/dev-server/index.ts

@@ -42,27 +42,14 @@ export function executeCustomDevServerBuilder(
       const middleware = await Promise.all(
         (options.middlewares || []).map(middlewarePath =>
           // https://github.com/angular/angular-cli/pull/26212/files#diff-a99020cbdb97d20b2bc686bcb64b31942107d56db06fd880171b0a86f7859e6eR52
-          loadModule<Connect.NextHandleFunction>(
-            path.join(workspaceRoot, middlewarePath),
-            tsConfig,
-            context.logger
-          )
+          loadModule<Connect.NextHandleFunction>(path.join(workspaceRoot, middlewarePath), tsConfig)
         )
       );
 
-      const buildPlugins = await loadPlugins(
-        buildOptions.plugins,
-        workspaceRoot,
-        tsConfig,
-        context.logger
-      );
+      const buildPlugins = await loadPlugins(buildOptions.plugins, workspaceRoot, tsConfig);
 
       const indexHtmlTransformer: IndexHtmlTransform = buildOptions.indexHtmlTransformer
-        ? await loadModule(
-            path.join(workspaceRoot, buildOptions.indexHtmlTransformer),
-            tsConfig,
-            context.logger
-          )
+        ? await loadModule(path.join(workspaceRoot, buildOptions.indexHtmlTransformer), tsConfig)
         : undefined;
 
       patchBuilderContext(context, buildTarget);

packages/custom-esbuild/src/load-plugins.ts

@@ -1,17 +1,15 @@
 import * as path from 'node:path';
 import type { Plugin } from 'esbuild';
-import type { logging } from '@angular-devkit/core';
 import { loadModule } from '@angular-builders/common';
 
 export async function loadPlugins(
   paths: string[] | undefined,
   workspaceRoot: string,
-  tsConfig: string,
-  logger: logging.LoggerApi
+  tsConfig: string
 ): Promise<Plugin[]> {
   const plugins = await Promise.all(
     (paths || []).map(pluginPath =>
-      loadModule<Plugin | Plugin[]>(path.join(workspaceRoot, pluginPath), tsConfig, logger)
+      loadModule<Plugin | Plugin[]>(path.join(workspaceRoot, pluginPath), tsConfig)
     )
   );
 

packages/custom-webpack/src/custom-webpack-builder.ts

@@ -47,8 +47,7 @@ export class CustomWebpackBuilder {
     );
     const configOrFactoryOrPromise = await loadModule<CustomWebpackConfig>(
       webpackConfigPath,
-      tsConfig,
-      logger
+      tsConfig
     );
 
     if (typeof configOrFactoryOrPromise === 'function') {

packages/custom-webpack/src/transform-factories.spec.ts

@@ -1,8 +1,12 @@
 jest.mock('ts-node', () => ({
-  register: jest.fn(),
+  register: jest.fn().mockReturnValue({
+    enabled: jest.fn(),
+  }),
 }));
 jest.mock('tsconfig-paths', () => ({
-  loadConfig: jest.fn().mockReturnValue({}),
+  loadConfig: jest.fn().mockReturnValue({
+    register: jest.fn().mockReturnValue(() => {}),
+  }),
 }));
 import { getTransforms } from './transform-factories';
 
@@ -32,7 +36,6 @@ describe('getTransforms', () => {
     transforms.webpackConfiguration({});
 
     expect(tsNode.register).toHaveBeenCalledTimes(1);
-    expect(logger.warn).not.toHaveBeenCalled();
 
     const transforms2 = getTransforms(
       {
@@ -45,7 +48,5 @@ describe('getTransforms', () => {
       { workspaceRoot: './test', logger } as any
     );
     transforms2.webpackConfiguration({});
-
-    expect(logger.warn).toHaveBeenCalledTimes(1);
   });
 });