refactor(ngcc): moved shared setup into a single function (#36637)

The `main.ts` and `worker.ts` had duplicate logic, which has now been
moved to a single function called `getSharedSetup()`.

PR Close #36637

packages/compiler-cli/ngcc/index.ts

@@ -7,13 +7,12 @@
  */
 import {CachedFileSystem, NodeJSFileSystem, setFileSystem} from '../src/ngtsc/file_system';
 
-import {AsyncNgccOptions, NgccOptions, SyncNgccOptions} from './src/command_line_options';
 import {mainNgcc} from './src/main';
+import {AsyncNgccOptions, NgccOptions, SyncNgccOptions} from './src/ngcc_options';
 
-export {AsyncNgccOptions, NgccOptions, SyncNgccOptions} from './src/command_line_options';
 export {ConsoleLogger} from './src/logging/console_logger';
 export {Logger, LogLevel} from './src/logging/logger';
-export {PathMappings} from './src/utils';
+export {AsyncNgccOptions, NgccOptions, PathMappings, SyncNgccOptions} from './src/ngcc_options';
 
 export function process(options: AsyncNgccOptions): Promise<void>;
 export function process(options: SyncNgccOptions): void;

packages/compiler-cli/ngcc/src/command_line_options.ts

@@ -8,129 +8,10 @@
  */
 import * as yargs from 'yargs';
 
-import {resolve, setFileSystem, CachedFileSystem, NodeJSFileSystem, FileSystem} from '../../src/ngtsc/file_system';
+import {resolve, setFileSystem, CachedFileSystem, NodeJSFileSystem} from '../../src/ngtsc/file_system';
 import {ConsoleLogger} from './logging/console_logger';
-import {LogLevel, Logger} from './logging/logger';
-import {PathMappings} from './utils';
-
-/**
- * The options to configure the ngcc compiler for synchronous execution.
- */
-export interface SyncNgccOptions {
-  /** The absolute path to the `node_modules` folder that contains the packages to process. */
-  basePath: string;
-
-  /**
-   * The path to the primary package to be processed. If not absolute then it must be relative to
-   * `basePath`.
-   *
-   * All its dependencies will need to be processed too.
-   *
-   * If this property is provided then `errorOnFailedEntryPoint` is forced to true.
-   */
-  targetEntryPointPath?: string;
-
-  /**
-   * Which entry-point properties in the package.json to consider when processing an entry-point.
-   * Each property should hold a path to the particular bundle format for the entry-point.
-   * Defaults to all the properties in the package.json.
-   */
-  propertiesToConsider?: string[];
-
-  /**
-   * Whether to process all formats specified by (`propertiesToConsider`)  or to stop processing
-   * this entry-point at the first matching format. Defaults to `true`.
-   */
-  compileAllFormats?: boolean;
-
-  /**
-   * Whether to create new entry-points bundles rather than overwriting the original files.
-   */
-  createNewEntryPointFormats?: boolean;
-
-  /**
-   * Provide a logger that will be called with log messages.
-   */
-  logger?: Logger;
-
-  /**
-   * Paths mapping configuration (`paths` and `baseUrl`), as found in `ts.CompilerOptions`.
-   * These are used to resolve paths to locally built Angular libraries.
-   *
-   * Note that `pathMappings` specified here take precedence over any `pathMappings` loaded from a
-   * TS config file.
-   */
-  pathMappings?: PathMappings;
-
-  /**
-   * Provide a file-system service that will be used by ngcc for all file interactions.
-   */
-  fileSystem?: FileSystem;
-
-  /**
-   * Whether the compilation should run and return asynchronously. Allowing asynchronous execution
-   * may speed up the compilation by utilizing multiple CPU cores (if available).
-   *
-   * Default: `false` (i.e. run synchronously)
-   */
-  async?: false;
-
-  /**
-   * Set to true in order to terminate immediately with an error code if an entry-point fails to be
-   * processed.
-   *
-   * If `targetEntryPointPath` is provided then this property is always true and cannot be
-   * changed. Otherwise the default is false.
-   *
-   * When set to false, ngcc will continue to process entry-points after a failure. In which case it
-   * will log an error and resume processing other entry-points.
-   */
-  errorOnFailedEntryPoint?: boolean;
-
-  /**
-   * Render `$localize` messages with legacy format ids.
-   *
-   * The default value is `true`. Only set this to `false` if you do not want legacy message ids to
-   * be rendered. For example, if you are not using legacy message ids in your translation files
-   * AND are not doing compile-time inlining of translations, in which case the extra message ids
-   * would add unwanted size to the final source bundle.
-   *
-   * It is safe to leave this set to true if you are doing compile-time inlining because the extra
-   * legacy message ids will all be stripped during translation.
-   */
-  enableI18nLegacyMessageIdFormat?: boolean;
-
-  /**
-   * Whether to invalidate any entry-point manifest file that is on disk. Instead, walk the
-   * directory tree looking for entry-points, and then write a new entry-point manifest, if
-   * possible.
-   *
-   * Default: `false` (i.e. the manifest will be used if available)
-   */
-  invalidateEntryPointManifest?: boolean;
-
-  /**
-   * An absolute path to a TS config file (e.g. `tsconfig.json`) or a directory containing one, that
-   * will be used to configure module resolution with things like path mappings, if not specified
-   * explicitly via the `pathMappings` property to `mainNgcc`.
-   *
-   * If `undefined`, ngcc will attempt to load a `tsconfig.json` file from the directory above the
-   * `basePath`.
-   *
-   * If `null`, ngcc will not attempt to load any TS config file at all.
-   */
-  tsConfigPath?: string|null;
-}
-
-/**
- * The options to configure the ngcc compiler for asynchronous execution.
- */
-export type AsyncNgccOptions = Omit<SyncNgccOptions, 'async'>&{async: true};
-
-/**
- * The options to configure the ngcc compiler.
- */
-export type NgccOptions = AsyncNgccOptions|SyncNgccOptions;
+import {LogLevel} from './logging/logger';
+import {NgccOptions} from './ngcc_options';
 
 export function parseCommandLineOptions(args: string[]): NgccOptions {
   const options =

packages/compiler-cli/ngcc/src/dependencies/dts_dependency_host.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {AbsoluteFsPath, FileSystem} from '../../../src/ngtsc/file_system';
-import {PathMappings} from '../utils';
+import {PathMappings} from '../ngcc_options';
 import {EsmDependencyHost} from './esm_dependency_host';
 import {ModuleResolver} from './module_resolver';
 

packages/compiler-cli/ngcc/src/dependencies/module_resolver.ts

@@ -6,7 +6,8 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {absoluteFrom, AbsoluteFsPath, dirname, FileSystem, isRoot, join, resolve} from '../../../src/ngtsc/file_system';
-import {isRelativePath, PathMappings, resolveFileWithPostfixes} from '../utils';
+import {PathMappings} from '../ngcc_options';
+import {isRelativePath, resolveFileWithPostfixes} from '../utils';
 
 /**
  * This is a very cut-down implementation of the TypeScript module resolution strategy.

packages/compiler-cli/ngcc/src/entry_point_finder/directory_walker_entry_point_finder.ts

@@ -9,10 +9,10 @@ import {AbsoluteFsPath, FileSystem, PathSegment} from '../../../src/ngtsc/file_s
 import {EntryPointWithDependencies} from '../dependencies/dependency_host';
 import {DependencyResolver, SortedEntryPointsInfo} from '../dependencies/dependency_resolver';
 import {Logger} from '../logging/logger';
+import {PathMappings} from '../ngcc_options';
 import {NgccConfiguration} from '../packages/configuration';
 import {getEntryPointInfo, INCOMPATIBLE_ENTRY_POINT, NO_ENTRY_POINT} from '../packages/entry_point';
 import {EntryPointManifest} from '../packages/entry_point_manifest';
-import {PathMappings} from '../utils';
 import {NGCC_DIRECTORY} from '../writing/new_entry_point_file_writer';
 
 import {EntryPointFinder} from './interface';

packages/compiler-cli/ngcc/src/entry_point_finder/targeted_entry_point_finder.ts

@@ -9,10 +9,10 @@ import {AbsoluteFsPath, FileSystem, join, PathSegment, relative, relativeFrom} f
 import {EntryPointWithDependencies} from '../dependencies/dependency_host';
 import {DependencyResolver, SortedEntryPointsInfo} from '../dependencies/dependency_resolver';
 import {Logger} from '../logging/logger';
+import {PathMappings} from '../ngcc_options';
 import {hasBeenProcessed} from '../packages/build_marker';
 import {NgccConfiguration} from '../packages/configuration';
 import {EntryPoint, EntryPointJsonProperty, getEntryPointInfo, INCOMPATIBLE_ENTRY_POINT, NO_ENTRY_POINT} from '../packages/entry_point';
-import {PathMappings} from '../utils';
 
 import {EntryPointFinder} from './interface';
 import {getBasePaths} from './utils';

packages/compiler-cli/ngcc/src/entry_point_finder/utils.ts

@@ -7,7 +7,7 @@
  */
 import {AbsoluteFsPath, getFileSystem, relative, resolve} from '../../../src/ngtsc/file_system';
 import {Logger} from '../logging/logger';
-import {PathMappings} from '../utils';
+import {PathMappings} from '../ngcc_options';
 
 /**
  * Extract all the base-paths that we need to search for entry-points.

packages/compiler-cli/ngcc/src/execution/cluster/worker.ts

@@ -9,12 +9,11 @@
 
 import * as cluster from 'cluster';
 
-import {absoluteFrom, CachedFileSystem, getFileSystem, NodeJSFileSystem, setFileSystem} from '../../../../src/ngtsc/file_system';
-import {readConfiguration} from '../../../../src/perform_compile';
+import {CachedFileSystem, NodeJSFileSystem, setFileSystem} from '../../../../src/ngtsc/file_system';
 import {parseCommandLineOptions} from '../../command_line_options';
 import {ConsoleLogger} from '../../logging/console_logger';
 import {Logger, LogLevel} from '../../logging/logger';
-import {getPathMappingsFromTsConfig} from '../../utils';
+import {getSharedSetup} from '../../ngcc_options';
 import {CreateCompileFn} from '../api';
 import {getCreateCompileFn} from '../create_compile_function';
 import {stringifyTask} from '../tasks/utils';
@@ -25,34 +24,21 @@ import {sendMessageToMaster} from './utils';
 
 // Cluster worker entry point
 if (require.main === module) {
-  process.title = 'ngcc (worker)';
-  setFileSystem(new CachedFileSystem(new NodeJSFileSystem()));
-  let {
-    basePath,
-    targetEntryPointPath,
-    createNewEntryPointFormats = false,
-    logger = new ConsoleLogger(LogLevel.info),
-    pathMappings,
-    errorOnFailedEntryPoint = false,
-    enableI18nLegacyMessageIdFormat = true,
-    tsConfigPath
-  } = parseCommandLineOptions(process.argv.slice(2));
   (async () => {
+    process.title = 'ngcc (worker)';
+
     try {
-      if (!!targetEntryPointPath) {
-        // targetEntryPointPath forces us to error if an entry-point fails.
-        errorOnFailedEntryPoint = true;
-      }
+      setFileSystem(new CachedFileSystem(new NodeJSFileSystem()));
 
-      const fileSystem = getFileSystem();
-      const absBasePath = absoluteFrom(basePath);
-      const projectPath = fileSystem.dirname(absBasePath);
-      const tsConfig =
-          tsConfigPath !== null ? readConfiguration(tsConfigPath || projectPath) : null;
-
-      if (pathMappings === undefined) {
-        pathMappings = getPathMappingsFromTsConfig(tsConfig, projectPath);
-      }
+      const {
+        createNewEntryPointFormats = false,
+        logger = new ConsoleLogger(LogLevel.info),
+        pathMappings,
+        errorOnFailedEntryPoint = false,
+        enableI18nLegacyMessageIdFormat = true,
+        fileSystem,
+        tsConfig
+      } = getSharedSetup(parseCommandLineOptions(process.argv.slice(2)));
 
       // NOTE: To avoid file corruption, `ngcc` invocation only creates _one_ instance of
       // `PackageJsonUpdater` that actually writes to disk (across all processes).
@@ -68,7 +54,7 @@ if (require.main === module) {
       process.exitCode = 0;
     } catch (e) {
       console.error(e.stack || e.message);
-      process.exitCode = 1;
+      process.exit(1);
     }
   })();
 }

packages/compiler-cli/ngcc/src/execution/create_compile_function.ts

@@ -12,9 +12,9 @@ import {replaceTsWithNgInErrors} from '../../../src/ngtsc/diagnostics';
 import {FileSystem} from '../../../src/ngtsc/file_system';
 import {ParsedConfiguration} from '../../../src/perform_compile';
 import {Logger} from '../logging/logger';
+import {PathMappings} from '../ngcc_options';
 import {getEntryPointFormat} from '../packages/entry_point';
 import {makeEntryPointBundle} from '../packages/entry_point_bundle';
-import {PathMappings} from '../utils';
 import {FileWriter} from '../writing/file_writer';
 import {InPlaceFileWriter} from '../writing/in_place_file_writer';
 import {NewEntryPointFileWriter} from '../writing/new_entry_point_file_writer';

packages/compiler-cli/ngcc/src/main.ts

@@ -10,10 +10,8 @@
 
 import * as os from 'os';
 
-import {readConfiguration} from '../..';
-import {absoluteFrom, AbsoluteFsPath, dirname, FileSystem, getFileSystem, resolve} from '../../src/ngtsc/file_system';
+import {AbsoluteFsPath, FileSystem, resolve} from '../../src/ngtsc/file_system';
 
-import {AsyncNgccOptions, NgccOptions, SyncNgccOptions} from './command_line_options';
 import {CommonJsDependencyHost} from './dependencies/commonjs_dependency_host';
 import {DependencyResolver} from './dependencies/dependency_resolver';
 import {DtsDependencyHost} from './dependencies/dts_dependency_host';
@@ -33,12 +31,11 @@ import {composeTaskCompletedCallbacks, createLogErrorHandler, createMarkAsProces
 import {AsyncLocker} from './locking/async_locker';
 import {LockFileWithChildProcess} from './locking/lock_file_with_child_process';
 import {SyncLocker} from './locking/sync_locker';
-import {ConsoleLogger} from './logging/console_logger';
-import {Logger, LogLevel} from './logging/logger';
+import {Logger} from './logging/logger';
+import {AsyncNgccOptions, getSharedSetup, NgccOptions, PathMappings, SyncNgccOptions} from './ngcc_options';
 import {NgccConfiguration} from './packages/configuration';
 import {EntryPointJsonProperty, SUPPORTED_FORMAT_PROPERTIES} from './packages/entry_point';
 import {EntryPointManifest, InvalidatingEntryPointManifest} from './packages/entry_point_manifest';
-import {getPathMappingsFromTsConfig, PathMappings} from './utils';
 import {DirectPackageJsonUpdater, PackageJsonUpdater} from './writing/package_json_updater';
 
 /**
@@ -51,41 +48,26 @@ import {DirectPackageJsonUpdater, PackageJsonUpdater} from './writing/package_js
  */
 export function mainNgcc(options: AsyncNgccOptions): Promise<void>;
 export function mainNgcc(options: SyncNgccOptions): void;
-export function mainNgcc({
-  basePath,
-  targetEntryPointPath,
-  propertiesToConsider = SUPPORTED_FORMAT_PROPERTIES,
-  compileAllFormats = true,
-  createNewEntryPointFormats = false,
-  logger = new ConsoleLogger(LogLevel.info),
-  pathMappings,
-  async = false,
-  errorOnFailedEntryPoint = false,
-  enableI18nLegacyMessageIdFormat = true,
-  invalidateEntryPointManifest = false,
-  tsConfigPath
-}: NgccOptions): void|Promise<void> {
-  if (!!targetEntryPointPath) {
-    // targetEntryPointPath forces us to error if an entry-point fails.
-    errorOnFailedEntryPoint = true;
-  }
+export function mainNgcc(options: NgccOptions): void|Promise<void> {
+  const {
+    basePath,
+    targetEntryPointPath,
+    propertiesToConsider,
+    compileAllFormats,
+    createNewEntryPointFormats,
+    logger,
+    pathMappings,
+    async,
+    errorOnFailedEntryPoint,
+    enableI18nLegacyMessageIdFormat,
+    invalidateEntryPointManifest,
+    fileSystem,
+    absBasePath,
+    projectPath,
+    tsConfig
+  } = getSharedSetup(options);
 
-  // Execute in parallel, if async execution is acceptable and there are more than 1 CPU cores.
-  const inParallel = async && (os.cpus().length > 1);
-
-  // Instantiate common utilities that are always used.
-  // NOTE: Avoid eagerly instantiating anything that might not be used when running sync/async or in
-  //       master/worker process.
-  const fileSystem = getFileSystem();
-  const absBasePath = absoluteFrom(basePath);
-  const projectPath = dirname(absBasePath);
   const config = new NgccConfiguration(fileSystem, projectPath);
-  const tsConfig = tsConfigPath !== null ? readConfiguration(tsConfigPath || projectPath) : null;
-
-  if (pathMappings === undefined) {
-    pathMappings = getPathMappingsFromTsConfig(tsConfig, projectPath);
-  }
-
   const dependencyResolver = getDependencyResolver(fileSystem, logger, config, pathMappings);
   const entryPointManifest = invalidateEntryPointManifest ?
       new InvalidatingEntryPointManifest(fileSystem, config, logger) :
@@ -104,12 +86,16 @@ export function mainNgcc({
     return;
   }
 
-  const pkgJsonUpdater = new DirectPackageJsonUpdater(fileSystem);
+  // Execute in parallel, if async execution is acceptable and there are more than 1 CPU cores.
+  const inParallel = async && (os.cpus().length > 1);
 
   const analyzeEntryPoints = getAnalyzeEntryPointsFn(
       logger, finder, fileSystem, supportedPropertiesToConsider, compileAllFormats,
       propertiesToConsider, inParallel);
 
+  // Create an updater that will actually write to disk. In
+  const pkgJsonUpdater = new DirectPackageJsonUpdater(fileSystem);
+
   // The function for creating the `compile()` function.
   const createCompileFn = getCreateCompileFn(
       fileSystem, logger, pkgJsonUpdater, createNewEntryPointFormats, errorOnFailedEntryPoint,

packages/compiler-cli/ngcc/src/ngcc_options.ts

@@ -0,0 +1,214 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * 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 {absoluteFrom, AbsoluteFsPath, FileSystem, getFileSystem, resolve} from '../../src/ngtsc/file_system';
+import {ParsedConfiguration, readConfiguration} from '../../src/perform_compile';
+
+import {ConsoleLogger} from './logging/console_logger';
+import {Logger, LogLevel} from './logging/logger';
+import {SUPPORTED_FORMAT_PROPERTIES} from './packages/entry_point';
+
+/**
+ * The options to configure the ngcc compiler for synchronous execution.
+ */
+export interface SyncNgccOptions {
+  /** The absolute path to the `node_modules` folder that contains the packages to process. */
+  basePath: string;
+
+  /**
+   * The path to the primary package to be processed. If not absolute then it must be relative to
+   * `basePath`.
+   *
+   * All its dependencies will need to be processed too.
+   *
+   * If this property is provided then `errorOnFailedEntryPoint` is forced to true.
+   */
+  targetEntryPointPath?: string;
+
+  /**
+   * Which entry-point properties in the package.json to consider when processing an entry-point.
+   * Each property should hold a path to the particular bundle format for the entry-point.
+   * Defaults to all the properties in the package.json.
+   */
+  propertiesToConsider?: string[];
+
+  /**
+   * Whether to process all formats specified by (`propertiesToConsider`)  or to stop processing
+   * this entry-point at the first matching format. Defaults to `true`.
+   */
+  compileAllFormats?: boolean;
+
+  /**
+   * Whether to create new entry-points bundles rather than overwriting the original files.
+   */
+  createNewEntryPointFormats?: boolean;
+
+  /**
+   * Provide a logger that will be called with log messages.
+   */
+  logger?: Logger;
+
+  /**
+   * Paths mapping configuration (`paths` and `baseUrl`), as found in `ts.CompilerOptions`.
+   * These are used to resolve paths to locally built Angular libraries.
+   *
+   * Note that `pathMappings` specified here take precedence over any `pathMappings` loaded from a
+   * TS config file.
+   */
+  pathMappings?: PathMappings;
+
+  /**
+   * Provide a file-system service that will be used by ngcc for all file interactions.
+   */
+  fileSystem?: FileSystem;
+
+  /**
+   * Whether the compilation should run and return asynchronously. Allowing asynchronous execution
+   * may speed up the compilation by utilizing multiple CPU cores (if available).
+   *
+   * Default: `false` (i.e. run synchronously)
+   */
+  async?: false;
+
+  /**
+   * Set to true in order to terminate immediately with an error code if an entry-point fails to be
+   * processed.
+   *
+   * If `targetEntryPointPath` is provided then this property is always true and cannot be
+   * changed. Otherwise the default is false.
+   *
+   * When set to false, ngcc will continue to process entry-points after a failure. In which case it
+   * will log an error and resume processing other entry-points.
+   */
+  errorOnFailedEntryPoint?: boolean;
+
+  /**
+   * Render `$localize` messages with legacy format ids.
+   *
+   * The default value is `true`. Only set this to `false` if you do not want legacy message ids to
+   * be rendered. For example, if you are not using legacy message ids in your translation files
+   * AND are not doing compile-time inlining of translations, in which case the extra message ids
+   * would add unwanted size to the final source bundle.
+   *
+   * It is safe to leave this set to true if you are doing compile-time inlining because the extra
+   * legacy message ids will all be stripped during translation.
+   */
+  enableI18nLegacyMessageIdFormat?: boolean;
+
+  /**
+   * Whether to invalidate any entry-point manifest file that is on disk. Instead, walk the
+   * directory tree looking for entry-points, and then write a new entry-point manifest, if
+   * possible.
+   *
+   * Default: `false` (i.e. the manifest will be used if available)
+   */
+  invalidateEntryPointManifest?: boolean;
+
+  /**
+   * An absolute path to a TS config file (e.g. `tsconfig.json`) or a directory containing one, that
+   * will be used to configure module resolution with things like path mappings, if not specified
+   * explicitly via the `pathMappings` property to `mainNgcc`.
+   *
+   * If `undefined`, ngcc will attempt to load a `tsconfig.json` file from the directory above the
+   * `basePath`.
+   *
+   * If `null`, ngcc will not attempt to load any TS config file at all.
+   */
+  tsConfigPath?: string|null;
+}
+
+/**
+ * The options to configure the ngcc compiler for asynchronous execution.
+ */
+export type AsyncNgccOptions = Omit<SyncNgccOptions, 'async'>&{async: true};
+
+/**
+ * The options to configure the ngcc compiler.
+ */
+export type NgccOptions = AsyncNgccOptions|SyncNgccOptions;
+
+export type PathMappings = {
+  baseUrl: string,
+  paths: {[key: string]: string[]}
+};
+
+/**
+ * If `pathMappings` is not provided directly, then try getting it from `tsConfig`, if available.
+ */
+export function getPathMappingsFromTsConfig(
+    tsConfig: ParsedConfiguration|null, projectPath: AbsoluteFsPath): PathMappings|undefined {
+  if (tsConfig !== null && tsConfig.options.baseUrl !== undefined &&
+      tsConfig.options.paths !== undefined) {
+    return {
+      baseUrl: resolve(projectPath, tsConfig.options.baseUrl),
+      paths: tsConfig.options.paths,
+    };
+  }
+}
+
+export type OptionalNgccOptionKeys = 'targetEntryPointPath'|'tsConfigPath'|'pathMappings';
+export type RequiredNgccOptions = Required<Omit<NgccOptions, OptionalNgccOptionKeys>>;
+export type OptionalNgccOptions = Pick<NgccOptions, OptionalNgccOptionKeys>;
+export type SharedSetup = {
+  fileSystem: FileSystem; absBasePath: AbsoluteFsPath; projectPath: AbsoluteFsPath;
+  tsConfig: ParsedConfiguration | null;
+};
+
+/**
+ * Instantiate common utilities that are always used and fix up options with defaults, as necessary.
+ *
+ * NOTE: Avoid eagerly instantiating anything that might not be used when running sync/async.
+ */
+export function getSharedSetup(options: NgccOptions): SharedSetup&RequiredNgccOptions&
+    OptionalNgccOptions {
+  const fileSystem = getFileSystem();
+  const absBasePath = absoluteFrom(options.basePath);
+  const projectPath = fileSystem.dirname(absBasePath);
+  const tsConfig =
+      options.tsConfigPath !== null ? readConfiguration(options.tsConfigPath || projectPath) : null;
+
+  let {
+    basePath,
+    targetEntryPointPath,
+    propertiesToConsider = SUPPORTED_FORMAT_PROPERTIES,
+    compileAllFormats = true,
+    createNewEntryPointFormats = false,
+    logger = new ConsoleLogger(LogLevel.info),
+    pathMappings,
+    async = false,
+    errorOnFailedEntryPoint = false,
+    enableI18nLegacyMessageIdFormat = true,
+    invalidateEntryPointManifest = false,
+    tsConfigPath,
+  } = options;
+
+  pathMappings = options.pathMappings || getPathMappingsFromTsConfig(tsConfig, projectPath);
+
+  if (!!options.targetEntryPointPath) {
+    // targetEntryPointPath forces us to error if an entry-point fails.
+    errorOnFailedEntryPoint = true;
+  }
+
+  return {
+    basePath,
+    targetEntryPointPath,
+    propertiesToConsider,
+    compileAllFormats,
+    createNewEntryPointFormats,
+    logger,
+    pathMappings,
+    async,
+    errorOnFailedEntryPoint,
+    enableI18nLegacyMessageIdFormat,
+    invalidateEntryPointManifest,
+    tsConfigPath,
+    fileSystem,
+    absBasePath,
+    projectPath,
+    tsConfig,
+  };
+}

packages/compiler-cli/ngcc/src/packages/entry_point_bundle.ts

@@ -7,7 +7,7 @@
  */
 import * as ts from 'typescript';
 import {AbsoluteFsPath, FileSystem, NgtscCompilerHost} from '../../../src/ngtsc/file_system';
-import {PathMappings} from '../utils';
+import {PathMappings} from '../ngcc_options';
 import {BundleProgram, makeBundleProgram} from './bundle_program';
 import {EntryPoint, EntryPointFormat} from './entry_point';
 import {NgccSourcesCompilerHost} from './ngcc_compiler_host';

packages/compiler-cli/ngcc/src/utils.ts

@@ -5,10 +5,9 @@
  * 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 {ParsedConfiguration} from '@angular/compiler-cli/src/perform_compile';
 import * as ts from 'typescript';
 
-import {absoluteFrom, AbsoluteFsPath, FileSystem, isRooted, resolve} from '../../src/ngtsc/file_system';
+import {absoluteFrom, AbsoluteFsPath, FileSystem, isRooted} from '../../src/ngtsc/file_system';
 import {KnownDeclaration} from '../../src/ngtsc/reflection';
 
 /**
@@ -78,11 +77,6 @@ export function hasNameIdentifier(declaration: ts.Declaration): declaration is t
   return namedDeclaration.name !== undefined && ts.isIdentifier(namedDeclaration.name);
 }
 
-export type PathMappings = {
-  baseUrl: string,
-  paths: {[key: string]: string[]}
-};
-
 /**
  * Test whether a path is "relative".
  *
@@ -186,17 +180,3 @@ export function stripDollarSuffix(value: string): string {
 export function stripExtension(fileName: string): string {
   return fileName.replace(/\..+$/, '');
 }
-
-/**
- * If `pathMappings` is not provided directly, then try getting it from `tsConfig`, if available.
- */
-export function getPathMappingsFromTsConfig(
-    tsConfig: ParsedConfiguration|null, projectPath: AbsoluteFsPath): PathMappings|undefined {
-  if (tsConfig !== null && tsConfig.options.baseUrl !== undefined &&
-      tsConfig.options.paths !== undefined) {
-    return {
-      baseUrl: resolve(projectPath, tsConfig.options.baseUrl),
-      paths: tsConfig.options.paths,
-    };
-  }
-}

packages/compiler-cli/ngcc/test/entry_point_finder/directory_walker_entry_point_finder_spec.ts

@@ -13,10 +13,10 @@ import {DtsDependencyHost} from '../../src/dependencies/dts_dependency_host';
 import {EsmDependencyHost} from '../../src/dependencies/esm_dependency_host';
 import {ModuleResolver} from '../../src/dependencies/module_resolver';
 import {DirectoryWalkerEntryPointFinder} from '../../src/entry_point_finder/directory_walker_entry_point_finder';
+import {PathMappings} from '../../src/ngcc_options';
 import {NgccConfiguration} from '../../src/packages/configuration';
 import {EntryPoint} from '../../src/packages/entry_point';
 import {EntryPointManifest, EntryPointManifestFile} from '../../src/packages/entry_point_manifest';
-import {PathMappings} from '../../src/utils';
 import {MockLogger} from '../helpers/mock_logger';
 
 runInEachFileSystem(() => {

packages/compiler-cli/ngcc/test/entry_point_finder/targeted_entry_point_finder_spec.ts

@@ -13,10 +13,10 @@ import {DtsDependencyHost} from '../../src/dependencies/dts_dependency_host';
 import {EsmDependencyHost} from '../../src/dependencies/esm_dependency_host';
 import {ModuleResolver} from '../../src/dependencies/module_resolver';
 import {TargetedEntryPointFinder} from '../../src/entry_point_finder/targeted_entry_point_finder';
+import {PathMappings} from '../../src/ngcc_options';
 import {NGCC_VERSION} from '../../src/packages/build_marker';
 import {NgccConfiguration} from '../../src/packages/configuration';
 import {EntryPoint} from '../../src/packages/entry_point';
-import {PathMappings} from '../../src/utils';
 import {MockLogger} from '../helpers/mock_logger';
 
 runInEachFileSystem(() => {