refactor(ngcc): minor code clean-up following #32052 (#32427)

This commit addresses the review feedback from #32052, which was merged
before addressing the feedback there.

PR Close #32427

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

@@ -9,23 +9,23 @@
 import {EntryPoint, EntryPointJsonProperty} from '../packages/entry_point';
 
 /** The type of the function that analyzes entry-points and creates the list of tasks. */
-export type AnalyzeFn = () => {
+export type AnalyzeEntryPointsFn = () => {
   processingMetadataPerEntryPoint: Map<string, EntryPointProcessingMetadata>;
   tasks: Task[];
 };
 
-/**
- * The type of the function that creates the `compile()` function, which in turn can be used to
- * process tasks.
- */
-export type CreateCompileFn =
-    (onTaskCompleted: (task: Task, outcome: TaskProcessingOutcome) => void) => (task: Task) => void;
+/** The type of the function that can process/compile a task. */
+export type CompileFn = (task: Task) => void;
+
+/** The type of the function that creates the `CompileFn` function used to process tasks. */
+export type CreateCompileFn = (onTaskCompleted: TaskCompletedCallback) => CompileFn;
 
 /**
  * The type of the function that orchestrates and executes the required work (i.e. analyzes the
  * entry-points, processes the resulting tasks, does book-keeping and validates the final outcome).
  */
-export type ExecuteFn = (analyzeFn: AnalyzeFn, createCompileFn: CreateCompileFn) => void;
+export type ExecuteFn =
+    (analyzeEntryPoints: AnalyzeEntryPointsFn, createCompileFn: CreateCompileFn) => void;
 
 /** Represents metadata related to the processing of an entry-point. */
 export interface EntryPointProcessingMetadata {
@@ -64,6 +64,9 @@ export interface Task {
   processDts: boolean;
 }
 
+/** A function to be called once a task has been processed. */
+export type TaskCompletedCallback = (task: Task, outcome: TaskProcessingOutcome) => void;
+
 /** Represents the outcome of processing a `Task`. */
 export const enum TaskProcessingOutcome {
   /** The target format property was already processed - didn't have to do anything. */

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

@@ -16,12 +16,12 @@ import {ModuleResolver} from './dependencies/module_resolver';
 import {UmdDependencyHost} from './dependencies/umd_dependency_host';
 import {DirectoryWalkerEntryPointFinder} from './entry_point_finder/directory_walker_entry_point_finder';
 import {TargetedEntryPointFinder} from './entry_point_finder/targeted_entry_point_finder';
-import {AnalyzeFn, CreateCompileFn, EntryPointProcessingMetadata, ExecuteFn, Task, TaskProcessingOutcome} from './execution/api';
+import {AnalyzeEntryPointsFn, CreateCompileFn, EntryPointProcessingMetadata, ExecuteFn, Task, TaskProcessingOutcome} from './execution/api';
 import {ConsoleLogger, LogLevel} from './logging/console_logger';
 import {Logger} from './logging/logger';
 import {hasBeenProcessed, markAsProcessed} from './packages/build_marker';
 import {NgccConfiguration} from './packages/configuration';
-import {EntryPoint, EntryPointJsonProperty, EntryPointPackageJson, SUPPORTED_FORMAT_PROPERTIES, getEntryPointFormat} from './packages/entry_point';
+import {EntryPoint, EntryPointJsonProperty, EntryPointPackageJson, PackageJsonFormatProperties, SUPPORTED_FORMAT_PROPERTIES, getEntryPointFormat} from './packages/entry_point';
 import {makeEntryPointBundle} from './packages/entry_point_bundle';
 import {Transformer} from './packages/transformer';
 import {PathMappings} from './utils';
@@ -87,7 +87,7 @@ export function mainNgcc(
   const fileSystem = getFileSystem();
 
   // The function for performing the analysis.
-  const analyzeFn: AnalyzeFn = () => {
+  const analyzeEntryPoints: AnalyzeEntryPointsFn = () => {
     const supportedPropertiesToConsider = ensureSupportedProperties(propertiesToConsider);
 
     const moduleResolver = new ModuleResolver(fileSystem, pathMappings);
@@ -113,13 +113,12 @@ export function mainNgcc(
     for (const entryPoint of entryPoints) {
       const packageJson = entryPoint.packageJson;
       const hasProcessedTypings = hasBeenProcessed(packageJson, 'typings', entryPoint.path);
-      const {propertiesToProcess, propertyToPropertiesToMarkAsProcessed} =
-          getPropertiesToProcessAndMarkAsProcessed(packageJson, supportedPropertiesToConsider);
+      const {propertiesToProcess, equivalentPropertiesMap} =
+          getPropertiesToProcess(packageJson, supportedPropertiesToConsider);
       let processDts = !hasProcessedTypings;
 
       for (const formatProperty of propertiesToProcess) {
-        const formatPropertiesToMarkAsProcessed =
-            propertyToPropertiesToMarkAsProcessed.get(formatProperty) !;
+        const formatPropertiesToMarkAsProcessed = equivalentPropertiesMap.get(formatProperty) !;
         tasks.push({entryPoint, formatProperty, formatPropertiesToMarkAsProcessed, processDts});
 
         // Only process typings for the first property (if not already processed).
@@ -189,8 +188,9 @@ export function mainNgcc(
   };
 
   // The function for actually planning and getting the work done.
-  const executeFn: ExecuteFn = (analyzeFn: AnalyzeFn, createCompileFn: CreateCompileFn) => {
-    const {processingMetadataPerEntryPoint, tasks} = analyzeFn();
+  const execute: ExecuteFn =
+      (analyzeEntryPoints: AnalyzeEntryPointsFn, createCompileFn: CreateCompileFn) => {
+        const {processingMetadataPerEntryPoint, tasks} = analyzeEntryPoints();
         const compile = createCompileFn((task, outcome) => {
           const {entryPoint, formatPropertiesToMarkAsProcessed, processDts} = task;
           const processingMeta = processingMetadataPerEntryPoint.get(entryPoint.path) !;
@@ -198,7 +198,7 @@ export function mainNgcc(
 
           if (outcome === TaskProcessingOutcome.Processed) {
             const packageJsonPath = fileSystem.resolve(entryPoint.path, 'package.json');
-        const propsToMarkAsProcessed: (EntryPointJsonProperty | 'typings')[] =
+            const propsToMarkAsProcessed: PackageJsonFormatProperties[] =
                 [...formatPropertiesToMarkAsProcessed];
 
             if (processDts) {
@@ -236,7 +236,7 @@ export function mainNgcc(
         }
       };
 
-  return executeFn(analyzeFn, createCompileFn);
+  return execute(analyzeEntryPoints, createCompileFn);
 }
 
 function ensureSupportedProperties(properties: string[]): EntryPointJsonProperty[] {
@@ -370,16 +370,16 @@ function logInvalidEntryPoints(logger: Logger, invalidEntryPoints: InvalidEntryP
 /**
  * This function computes and returns the following:
  * - `propertiesToProcess`: An (ordered) list of properties that exist and need to be processed,
- *   based on the specified `propertiesToConsider`, the properties in `package.json` and their
+ *   based on the provided `propertiesToConsider`, the properties in `package.json` and their
  *   corresponding format-paths. NOTE: Only one property per format-path needs to be processed.
- * - `propertyToPropertiesToMarkAsProcessed`: A mapping from each property in `propertiesToProcess`
- *   to the list of other properties in `package.json` that need to be marked as processed as soon
- *   as of the former being processed.
+ * - `equivalentPropertiesMap`: A mapping from each property in `propertiesToProcess` to the list of
+ *   other format properties in `package.json` that need to be marked as processed as soon as the
+ *   former has been processed.
  */
-function getPropertiesToProcessAndMarkAsProcessed(
+function getPropertiesToProcess(
     packageJson: EntryPointPackageJson, propertiesToConsider: EntryPointJsonProperty[]): {
   propertiesToProcess: EntryPointJsonProperty[];
-  propertyToPropertiesToMarkAsProcessed: Map<EntryPointJsonProperty, EntryPointJsonProperty[]>;
+  equivalentPropertiesMap: Map<EntryPointJsonProperty, EntryPointJsonProperty[]>;
 } {
   const formatPathsToConsider = new Set<string>();
 
@@ -413,13 +413,12 @@ function getPropertiesToProcessAndMarkAsProcessed(
     list.push(prop);
   }
 
-  const propertyToPropertiesToMarkAsProcessed =
-      new Map<EntryPointJsonProperty, EntryPointJsonProperty[]>();
+  const equivalentPropertiesMap = new Map<EntryPointJsonProperty, EntryPointJsonProperty[]>();
   for (const prop of propertiesToConsider) {
     const formatPath = packageJson[prop] !;
-    const propertiesToMarkAsProcessed = formatPathToProperties[formatPath];
-    propertyToPropertiesToMarkAsProcessed.set(prop, propertiesToMarkAsProcessed);
+    const equivalentProperties = formatPathToProperties[formatPath];
+    equivalentPropertiesMap.set(prop, equivalentProperties);
   }
 
-  return {propertiesToProcess, propertyToPropertiesToMarkAsProcessed};
+  return {propertiesToProcess, equivalentPropertiesMap};
 }

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

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import {AbsoluteFsPath, FileSystem, dirname} from '../../../src/ngtsc/file_system';
-import {EntryPointJsonProperty, EntryPointPackageJson} from './entry_point';
+import {EntryPointPackageJson, PackageJsonFormatProperties} from './entry_point';
 
 export const NGCC_VERSION = '0.0.0-PLACEHOLDER';
 
@@ -23,7 +23,7 @@ export const NGCC_VERSION = '0.0.0-PLACEHOLDER';
  * @throws Error if the entry-point has already been processed with a different ngcc version.
  */
 export function hasBeenProcessed(
-    packageJson: EntryPointPackageJson, format: EntryPointJsonProperty | 'typings',
+    packageJson: EntryPointPackageJson, format: PackageJsonFormatProperties,
     entryPointPath: AbsoluteFsPath): boolean {
   if (!packageJson.__processed_by_ivy_ngcc__) {
     return false;
@@ -50,7 +50,7 @@ export function hasBeenProcessed(
  */
 export function markAsProcessed(
     fs: FileSystem, packageJson: EntryPointPackageJson, packageJsonPath: AbsoluteFsPath,
-    properties: (EntryPointJsonProperty | 'typings')[]) {
+    properties: PackageJsonFormatProperties[]) {
   const processed =
       packageJson.__processed_by_ivy_ngcc__ || (packageJson.__processed_by_ivy_ngcc__ = {});
 

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

@@ -7,7 +7,7 @@
  */
 import * as vm from 'vm';
 import {AbsoluteFsPath, FileSystem, dirname, join, resolve} from '../../../src/ngtsc/file_system';
-import {PackageJsonFormatProperties} from './entry_point';
+import {PackageJsonFormatPropertiesMap} from './entry_point';
 
 /**
  * The format of a project level configuration file.
@@ -41,7 +41,7 @@ export interface NgccEntryPointConfig {
    * This property, if provided, holds values that will override equivalent properties in an
    * entry-point's package.json file.
    */
-  override?: PackageJsonFormatProperties;
+  override?: PackageJsonFormatPropertiesMap;
 }
 
 const NGCC_CONFIG_FILENAME = 'ngcc.config.js';

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

@@ -38,7 +38,7 @@ export interface EntryPoint {
   compiledByAngular: boolean;
 }
 
-export interface PackageJsonFormatProperties {
+export interface PackageJsonFormatPropertiesMap {
   fesm2015?: string;
   fesm5?: string;
   es2015?: string;  // if exists then it is actually FESM2015
@@ -50,16 +50,18 @@ export interface PackageJsonFormatProperties {
   typings?: string;  // TypeScript .d.ts files
 }
 
+export type PackageJsonFormatProperties = keyof PackageJsonFormatPropertiesMap;
+
 /**
  * The properties that may be loaded from the `package.json` file.
  */
-export interface EntryPointPackageJson extends PackageJsonFormatProperties {
+export interface EntryPointPackageJson extends PackageJsonFormatPropertiesMap {
   name: string;
   scripts?: Record<string, string>;
   __processed_by_ivy_ngcc__?: Record<string, string>;
 }
 
-export type EntryPointJsonProperty = Exclude<keyof PackageJsonFormatProperties, 'types'|'typings'>;
+export type EntryPointJsonProperty = Exclude<PackageJsonFormatProperties, 'types'|'typings'>;
 // We need to keep the elements of this const and the `EntryPointJsonProperty` type in sync.
 export const SUPPORTED_FORMAT_PROPERTIES: EntryPointJsonProperty[] =
     ['fesm2015', 'fesm5', 'es2015', 'esm2015', 'esm5', 'main', 'module'];

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

@@ -6,8 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import * as ts from 'typescript';
-import {AbsoluteFsPath, FileSystem, absoluteFrom} from '../../../src/ngtsc/file_system';
-import {NgtscCompilerHost} from '../../../src/ngtsc/file_system/src/compiler_host';
+import {AbsoluteFsPath, FileSystem, NgtscCompilerHost, absoluteFrom} from '../../../src/ngtsc/file_system';
 import {PathMappings} from '../utils';
 import {BundleProgram, makeBundleProgram} from './bundle_program';
 import {EntryPoint, EntryPointFormat} from './entry_point';

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

@@ -7,8 +7,7 @@
  */
 import * as ts from 'typescript';
 
-import {FileSystem} from '../../../src/ngtsc/file_system';
-import {NgtscCompilerHost} from '../../../src/ngtsc/file_system/src/compiler_host';
+import {FileSystem, NgtscCompilerHost} from '../../../src/ngtsc/file_system';
 import {isRelativePath} from '../utils';
 
 /**