939 lines
29 KiB
TypeScript
939 lines
29 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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'use strict';
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import * as fs from 'fs';
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import * as path from 'path';
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import * as ts from 'typescript';
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const TYPESCRIPT_LIB_FOLDER = path.dirname(require.resolve('typescript/lib/lib.d.ts'));
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export const enum ShakeLevel {
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Files = 0,
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InnerFile = 1,
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ClassMembers = 2
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}
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export function toStringShakeLevel(shakeLevel: ShakeLevel): string {
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switch (shakeLevel) {
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case ShakeLevel.Files:
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return 'Files (0)';
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case ShakeLevel.InnerFile:
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return 'InnerFile (1)';
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case ShakeLevel.ClassMembers:
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return 'ClassMembers (2)';
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}
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}
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export interface ITreeShakingOptions {
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/**
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* The full path to the root where sources are.
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*/
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sourcesRoot: string;
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/**
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* Module ids.
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* e.g. `vs/editor/editor.main` or `index`
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*/
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entryPoints: string[];
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/**
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* Inline usages.
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*/
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inlineEntryPoints: string[];
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/**
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* Other .d.ts files
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*/
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typings: string[];
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/**
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* TypeScript compiler options.
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*/
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compilerOptions?: any;
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/**
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* The shake level to perform.
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*/
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shakeLevel: ShakeLevel;
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/**
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* regex pattern to ignore certain imports e.g. `vs/css!` imports
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*/
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importIgnorePattern: RegExp;
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redirects: { [module: string]: string; };
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}
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export interface ITreeShakingResult {
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[file: string]: string;
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}
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function printDiagnostics(options: ITreeShakingOptions, diagnostics: ReadonlyArray<ts.Diagnostic>): void {
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for (const diag of diagnostics) {
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let result = '';
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if (diag.file) {
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result += `${path.join(options.sourcesRoot, diag.file.fileName)}`;
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}
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if (diag.file && diag.start) {
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let location = diag.file.getLineAndCharacterOfPosition(diag.start);
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result += `:${location.line + 1}:${location.character}`;
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}
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result += ` - ` + JSON.stringify(diag.messageText);
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console.log(result);
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}
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}
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export function shake(options: ITreeShakingOptions): ITreeShakingResult {
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const languageService = createTypeScriptLanguageService(options);
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const program = languageService.getProgram()!;
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const globalDiagnostics = program.getGlobalDiagnostics();
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if (globalDiagnostics.length > 0) {
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printDiagnostics(options, globalDiagnostics);
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throw new Error(`Compilation Errors encountered.`);
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}
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const syntacticDiagnostics = program.getSyntacticDiagnostics();
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if (syntacticDiagnostics.length > 0) {
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printDiagnostics(options, syntacticDiagnostics);
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throw new Error(`Compilation Errors encountered.`);
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}
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const semanticDiagnostics = program.getSemanticDiagnostics();
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if (semanticDiagnostics.length > 0) {
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printDiagnostics(options, semanticDiagnostics);
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throw new Error(`Compilation Errors encountered.`);
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}
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markNodes(languageService, options);
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return generateResult(languageService, options.shakeLevel);
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}
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//#region Discovery, LanguageService & Setup
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function createTypeScriptLanguageService(options: ITreeShakingOptions): ts.LanguageService {
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// Discover referenced files
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const FILES = discoverAndReadFiles(options);
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// Add fake usage files
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options.inlineEntryPoints.forEach((inlineEntryPoint, index) => {
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FILES[`inlineEntryPoint.${index}.ts`] = inlineEntryPoint;
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});
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// Add additional typings
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options.typings.forEach((typing) => {
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const filePath = path.join(options.sourcesRoot, typing);
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FILES[typing] = fs.readFileSync(filePath).toString();
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});
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// Resolve libs
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const RESOLVED_LIBS = processLibFiles(options);
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const compilerOptions = ts.convertCompilerOptionsFromJson(options.compilerOptions, options.sourcesRoot).options;
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const host = new TypeScriptLanguageServiceHost(RESOLVED_LIBS, FILES, compilerOptions);
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return ts.createLanguageService(host);
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}
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/**
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* Read imports and follow them until all files have been handled
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*/
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function discoverAndReadFiles(options: ITreeShakingOptions): IFileMap {
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const FILES: IFileMap = {};
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const in_queue: { [module: string]: boolean; } = Object.create(null);
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const queue: string[] = [];
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const enqueue = (moduleId: string) => {
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if (in_queue[moduleId]) {
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return;
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}
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in_queue[moduleId] = true;
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queue.push(moduleId);
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};
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options.entryPoints.forEach((entryPoint) => enqueue(entryPoint));
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while (queue.length > 0) {
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const moduleId = queue.shift()!;
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const dts_filename = path.join(options.sourcesRoot, moduleId + '.d.ts');
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if (fs.existsSync(dts_filename)) {
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const dts_filecontents = fs.readFileSync(dts_filename).toString();
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FILES[`${moduleId}.d.ts`] = dts_filecontents;
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continue;
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}
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const js_filename = path.join(options.sourcesRoot, moduleId + '.js');
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if (fs.existsSync(js_filename)) {
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// This is an import for a .js file, so ignore it...
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continue;
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}
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let ts_filename: string;
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if (options.redirects[moduleId]) {
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ts_filename = path.join(options.sourcesRoot, options.redirects[moduleId] + '.ts');
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} else {
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ts_filename = path.join(options.sourcesRoot, moduleId + '.ts');
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}
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const ts_filecontents = fs.readFileSync(ts_filename).toString();
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const info = ts.preProcessFile(ts_filecontents);
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for (let i = info.importedFiles.length - 1; i >= 0; i--) {
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const importedFileName = info.importedFiles[i].fileName;
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if (options.importIgnorePattern.test(importedFileName)) {
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// Ignore vs/css! imports
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continue;
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}
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let importedModuleId = importedFileName;
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if (/(^\.\/)|(^\.\.\/)/.test(importedModuleId)) {
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importedModuleId = path.join(path.dirname(moduleId), importedModuleId);
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}
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enqueue(importedModuleId);
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}
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FILES[`${moduleId}.ts`] = ts_filecontents;
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}
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return FILES;
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}
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/**
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* Read lib files and follow lib references
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*/
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function processLibFiles(options: ITreeShakingOptions): ILibMap {
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const stack: string[] = [...options.compilerOptions.lib];
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const result: ILibMap = {};
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while (stack.length > 0) {
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const filename = `lib.${stack.shift()!.toLowerCase()}.d.ts`;
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const key = `defaultLib:${filename}`;
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if (!result[key]) {
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// add this file
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const filepath = path.join(TYPESCRIPT_LIB_FOLDER, filename);
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const sourceText = fs.readFileSync(filepath).toString();
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result[key] = sourceText;
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// precess dependencies and "recurse"
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const info = ts.preProcessFile(sourceText);
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for (let ref of info.libReferenceDirectives) {
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stack.push(ref.fileName);
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}
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}
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}
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return result;
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}
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interface ILibMap { [libName: string]: string; }
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interface IFileMap { [fileName: string]: string; }
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/**
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* A TypeScript language service host
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*/
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class TypeScriptLanguageServiceHost implements ts.LanguageServiceHost {
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private readonly _libs: ILibMap;
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private readonly _files: IFileMap;
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private readonly _compilerOptions: ts.CompilerOptions;
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constructor(libs: ILibMap, files: IFileMap, compilerOptions: ts.CompilerOptions) {
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this._libs = libs;
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this._files = files;
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this._compilerOptions = compilerOptions;
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}
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// --- language service host ---------------
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getCompilationSettings(): ts.CompilerOptions {
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return this._compilerOptions;
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}
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getScriptFileNames(): string[] {
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return (
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([] as string[])
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.concat(Object.keys(this._libs))
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.concat(Object.keys(this._files))
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);
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}
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getScriptVersion(_fileName: string): string {
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return '1';
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}
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getProjectVersion(): string {
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return '1';
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}
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getScriptSnapshot(fileName: string): ts.IScriptSnapshot {
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if (this._files.hasOwnProperty(fileName)) {
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return ts.ScriptSnapshot.fromString(this._files[fileName]);
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} else if (this._libs.hasOwnProperty(fileName)) {
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return ts.ScriptSnapshot.fromString(this._libs[fileName]);
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} else {
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return ts.ScriptSnapshot.fromString('');
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}
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}
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getScriptKind(_fileName: string): ts.ScriptKind {
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return ts.ScriptKind.TS;
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}
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getCurrentDirectory(): string {
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return '';
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}
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getDefaultLibFileName(_options: ts.CompilerOptions): string {
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return 'defaultLib:lib.d.ts';
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}
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isDefaultLibFileName(fileName: string): boolean {
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return fileName === this.getDefaultLibFileName(this._compilerOptions);
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}
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}
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//#endregion
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//#region Tree Shaking
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const enum NodeColor {
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White = 0,
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Gray = 1,
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Black = 2
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}
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function getColor(node: ts.Node): NodeColor {
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return (<any>node).$$$color || NodeColor.White;
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}
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function setColor(node: ts.Node, color: NodeColor): void {
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(<any>node).$$$color = color;
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}
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function nodeOrParentIsBlack(node: ts.Node): boolean {
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while (node) {
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const color = getColor(node);
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if (color === NodeColor.Black) {
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return true;
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}
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node = node.parent;
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}
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return false;
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}
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function nodeOrChildIsBlack(node: ts.Node): boolean {
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if (getColor(node) === NodeColor.Black) {
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return true;
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}
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for (const child of node.getChildren()) {
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if (nodeOrChildIsBlack(child)) {
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return true;
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}
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}
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return false;
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}
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function markNodes(languageService: ts.LanguageService, options: ITreeShakingOptions) {
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const program = languageService.getProgram();
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if (!program) {
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throw new Error('Could not get program from language service');
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}
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if (options.shakeLevel === ShakeLevel.Files) {
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// Mark all source files Black
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program.getSourceFiles().forEach((sourceFile) => {
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setColor(sourceFile, NodeColor.Black);
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});
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return;
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}
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const black_queue: ts.Node[] = [];
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const gray_queue: ts.Node[] = [];
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const export_import_queue: ts.Node[] = [];
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const sourceFilesLoaded: { [fileName: string]: boolean } = {};
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function enqueueTopLevelModuleStatements(sourceFile: ts.SourceFile): void {
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sourceFile.forEachChild((node: ts.Node) => {
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if (ts.isImportDeclaration(node)) {
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if (!node.importClause && ts.isStringLiteral(node.moduleSpecifier)) {
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setColor(node, NodeColor.Black);
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enqueueImport(node, node.moduleSpecifier.text);
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}
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return;
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}
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if (ts.isExportDeclaration(node)) {
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if (!node.exportClause && node.moduleSpecifier && ts.isStringLiteral(node.moduleSpecifier)) {
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// export * from "foo";
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setColor(node, NodeColor.Black);
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enqueueImport(node, node.moduleSpecifier.text);
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}
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if (node.exportClause && ts.isNamedExports(node.exportClause)) {
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for (const exportSpecifier of node.exportClause.elements) {
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export_import_queue.push(exportSpecifier);
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}
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}
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return;
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}
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if (
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ts.isExpressionStatement(node)
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|| ts.isIfStatement(node)
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|| ts.isIterationStatement(node, true)
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|| ts.isExportAssignment(node)
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) {
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enqueue_black(node);
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}
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if (ts.isImportEqualsDeclaration(node)) {
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if (/export/.test(node.getFullText(sourceFile))) {
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// e.g. "export import Severity = BaseSeverity;"
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enqueue_black(node);
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}
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}
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});
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}
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function enqueue_gray(node: ts.Node): void {
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if (nodeOrParentIsBlack(node) || getColor(node) === NodeColor.Gray) {
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return;
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}
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setColor(node, NodeColor.Gray);
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gray_queue.push(node);
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}
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function enqueue_black(node: ts.Node): void {
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const previousColor = getColor(node);
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if (previousColor === NodeColor.Black) {
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return;
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}
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if (previousColor === NodeColor.Gray) {
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// remove from gray queue
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gray_queue.splice(gray_queue.indexOf(node), 1);
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setColor(node, NodeColor.White);
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// add to black queue
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enqueue_black(node);
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// // move from one queue to the other
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// black_queue.push(node);
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// setColor(node, NodeColor.Black);
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return;
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}
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if (nodeOrParentIsBlack(node)) {
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return;
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}
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const fileName = node.getSourceFile().fileName;
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if (/^defaultLib:/.test(fileName) || /\.d\.ts$/.test(fileName)) {
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setColor(node, NodeColor.Black);
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return;
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}
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const sourceFile = node.getSourceFile();
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if (!sourceFilesLoaded[sourceFile.fileName]) {
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sourceFilesLoaded[sourceFile.fileName] = true;
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enqueueTopLevelModuleStatements(sourceFile);
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}
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if (ts.isSourceFile(node)) {
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return;
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}
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setColor(node, NodeColor.Black);
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black_queue.push(node);
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if (options.shakeLevel === ShakeLevel.ClassMembers && (ts.isMethodDeclaration(node) || ts.isMethodSignature(node) || ts.isPropertySignature(node) || ts.isPropertyDeclaration(node) || ts.isGetAccessor(node) || ts.isSetAccessor(node))) {
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const references = languageService.getReferencesAtPosition(node.getSourceFile().fileName, node.name.pos + node.name.getLeadingTriviaWidth());
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if (references) {
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for (let i = 0, len = references.length; i < len; i++) {
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const reference = references[i];
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const referenceSourceFile = program!.getSourceFile(reference.fileName);
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if (!referenceSourceFile) {
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continue;
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}
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const referenceNode = getTokenAtPosition(referenceSourceFile, reference.textSpan.start, false, false);
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if (
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ts.isMethodDeclaration(referenceNode.parent)
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|| ts.isPropertyDeclaration(referenceNode.parent)
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|| ts.isGetAccessor(referenceNode.parent)
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|| ts.isSetAccessor(referenceNode.parent)
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) {
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enqueue_gray(referenceNode.parent);
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}
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}
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}
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}
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}
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function enqueueFile(filename: string): void {
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const sourceFile = program!.getSourceFile(filename);
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if (!sourceFile) {
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console.warn(`Cannot find source file ${filename}`);
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return;
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}
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enqueue_black(sourceFile);
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}
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function enqueueImport(node: ts.Node, importText: string): void {
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if (options.importIgnorePattern.test(importText)) {
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// this import should be ignored
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return;
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}
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const nodeSourceFile = node.getSourceFile();
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let fullPath: string;
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if (/(^\.\/)|(^\.\.\/)/.test(importText)) {
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fullPath = path.join(path.dirname(nodeSourceFile.fileName), importText) + '.ts';
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} else {
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fullPath = importText + '.ts';
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}
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enqueueFile(fullPath);
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}
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options.entryPoints.forEach(moduleId => enqueueFile(moduleId + '.ts'));
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// Add fake usage files
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options.inlineEntryPoints.forEach((_, index) => enqueueFile(`inlineEntryPoint.${index}.ts`));
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let step = 0;
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const checker = program.getTypeChecker();
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while (black_queue.length > 0 || gray_queue.length > 0) {
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++step;
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let node: ts.Node;
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if (step % 100 === 0) {
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console.log(`Treeshaking - ${Math.floor(100 * step / (step + black_queue.length + gray_queue.length))}% - ${step}/${step + black_queue.length + gray_queue.length} (${black_queue.length}, ${gray_queue.length})`);
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}
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if (black_queue.length === 0) {
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for (let i = 0; i < gray_queue.length; i++) {
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const node = gray_queue[i];
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const nodeParent = node.parent;
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if ((ts.isClassDeclaration(nodeParent) || ts.isInterfaceDeclaration(nodeParent)) && nodeOrChildIsBlack(nodeParent)) {
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gray_queue.splice(i, 1);
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black_queue.push(node);
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setColor(node, NodeColor.Black);
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i--;
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}
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}
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}
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if (black_queue.length > 0) {
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node = black_queue.shift()!;
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} else {
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// only gray nodes remaining...
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break;
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}
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const nodeSourceFile = node.getSourceFile();
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const loop = (node: ts.Node) => {
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const [symbol, symbolImportNode] = getRealNodeSymbol(checker, node);
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if (symbolImportNode) {
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setColor(symbolImportNode, NodeColor.Black);
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}
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if (symbol && !nodeIsInItsOwnDeclaration(nodeSourceFile, node, symbol)) {
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for (let i = 0, len = symbol.declarations.length; i < len; i++) {
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const declaration = symbol.declarations[i];
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if (ts.isSourceFile(declaration)) {
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// Do not enqueue full source files
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// (they can be the declaration of a module import)
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continue;
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}
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if (options.shakeLevel === ShakeLevel.ClassMembers && (ts.isClassDeclaration(declaration) || ts.isInterfaceDeclaration(declaration)) && !isLocalCodeExtendingOrInheritingFromDefaultLibSymbol(program, checker, declaration)) {
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|
enqueue_black(declaration.name!);
|
|
|
|
for (let j = 0; j < declaration.members.length; j++) {
|
|
const member = declaration.members[j];
|
|
const memberName = member.name ? member.name.getText() : null;
|
|
if (
|
|
ts.isConstructorDeclaration(member)
|
|
|| ts.isConstructSignatureDeclaration(member)
|
|
|| ts.isIndexSignatureDeclaration(member)
|
|
|| ts.isCallSignatureDeclaration(member)
|
|
|| memberName === '[Symbol.iterator]'
|
|
|| memberName === '[Symbol.toStringTag]'
|
|
|| memberName === 'toJSON'
|
|
|| memberName === 'toString'
|
|
|| memberName === 'dispose'// TODO: keeping all `dispose` methods
|
|
|| /^_(.*)Brand$/.test(memberName || '') // TODO: keeping all members ending with `Brand`...
|
|
) {
|
|
enqueue_black(member);
|
|
}
|
|
}
|
|
|
|
// queue the heritage clauses
|
|
if (declaration.heritageClauses) {
|
|
for (let heritageClause of declaration.heritageClauses) {
|
|
enqueue_black(heritageClause);
|
|
}
|
|
}
|
|
} else {
|
|
enqueue_black(declaration);
|
|
}
|
|
}
|
|
}
|
|
node.forEachChild(loop);
|
|
};
|
|
node.forEachChild(loop);
|
|
}
|
|
|
|
while (export_import_queue.length > 0) {
|
|
const node = export_import_queue.shift()!;
|
|
if (nodeOrParentIsBlack(node)) {
|
|
continue;
|
|
}
|
|
const symbol: ts.Symbol | undefined = (<any>node).symbol;
|
|
if (!symbol) {
|
|
continue;
|
|
}
|
|
const aliased = checker.getAliasedSymbol(symbol);
|
|
if (aliased.declarations && aliased.declarations.length > 0) {
|
|
if (nodeOrParentIsBlack(aliased.declarations[0]) || nodeOrChildIsBlack(aliased.declarations[0])) {
|
|
setColor(node, NodeColor.Black);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
function nodeIsInItsOwnDeclaration(nodeSourceFile: ts.SourceFile, node: ts.Node, symbol: ts.Symbol): boolean {
|
|
for (let i = 0, len = symbol.declarations.length; i < len; i++) {
|
|
const declaration = symbol.declarations[i];
|
|
const declarationSourceFile = declaration.getSourceFile();
|
|
|
|
if (nodeSourceFile === declarationSourceFile) {
|
|
if (declaration.pos <= node.pos && node.end <= declaration.end) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
function generateResult(languageService: ts.LanguageService, shakeLevel: ShakeLevel): ITreeShakingResult {
|
|
const program = languageService.getProgram();
|
|
if (!program) {
|
|
throw new Error('Could not get program from language service');
|
|
}
|
|
|
|
let result: ITreeShakingResult = {};
|
|
const writeFile = (filePath: string, contents: string): void => {
|
|
result[filePath] = contents;
|
|
};
|
|
|
|
program.getSourceFiles().forEach((sourceFile) => {
|
|
const fileName = sourceFile.fileName;
|
|
if (/^defaultLib:/.test(fileName)) {
|
|
return;
|
|
}
|
|
const destination = fileName;
|
|
if (/\.d\.ts$/.test(fileName)) {
|
|
if (nodeOrChildIsBlack(sourceFile)) {
|
|
writeFile(destination, sourceFile.text);
|
|
}
|
|
return;
|
|
}
|
|
|
|
let text = sourceFile.text;
|
|
let result = '';
|
|
|
|
function keep(node: ts.Node): void {
|
|
result += text.substring(node.pos, node.end);
|
|
}
|
|
function write(data: string): void {
|
|
result += data;
|
|
}
|
|
|
|
function writeMarkedNodes(node: ts.Node): void {
|
|
if (getColor(node) === NodeColor.Black) {
|
|
return keep(node);
|
|
}
|
|
|
|
// Always keep certain top-level statements
|
|
if (ts.isSourceFile(node.parent)) {
|
|
if (ts.isExpressionStatement(node) && ts.isStringLiteral(node.expression) && node.expression.text === 'use strict') {
|
|
return keep(node);
|
|
}
|
|
|
|
if (ts.isVariableStatement(node) && nodeOrChildIsBlack(node)) {
|
|
return keep(node);
|
|
}
|
|
}
|
|
|
|
// Keep the entire import in import * as X cases
|
|
if (ts.isImportDeclaration(node)) {
|
|
if (node.importClause && node.importClause.namedBindings) {
|
|
if (ts.isNamespaceImport(node.importClause.namedBindings)) {
|
|
if (getColor(node.importClause.namedBindings) === NodeColor.Black) {
|
|
return keep(node);
|
|
}
|
|
} else {
|
|
let survivingImports: string[] = [];
|
|
for (const importNode of node.importClause.namedBindings.elements) {
|
|
if (getColor(importNode) === NodeColor.Black) {
|
|
survivingImports.push(importNode.getFullText(sourceFile));
|
|
}
|
|
}
|
|
const leadingTriviaWidth = node.getLeadingTriviaWidth();
|
|
const leadingTrivia = sourceFile.text.substr(node.pos, leadingTriviaWidth);
|
|
if (survivingImports.length > 0) {
|
|
if (node.importClause && node.importClause.name && getColor(node.importClause) === NodeColor.Black) {
|
|
return write(`${leadingTrivia}import ${node.importClause.name.text}, {${survivingImports.join(',')} } from${node.moduleSpecifier.getFullText(sourceFile)};`);
|
|
}
|
|
return write(`${leadingTrivia}import {${survivingImports.join(',')} } from${node.moduleSpecifier.getFullText(sourceFile)};`);
|
|
} else {
|
|
if (node.importClause && node.importClause.name && getColor(node.importClause) === NodeColor.Black) {
|
|
return write(`${leadingTrivia}import ${node.importClause.name.text} from${node.moduleSpecifier.getFullText(sourceFile)};`);
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
if (node.importClause && getColor(node.importClause) === NodeColor.Black) {
|
|
return keep(node);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (ts.isExportDeclaration(node)) {
|
|
if (node.exportClause && node.moduleSpecifier && ts.isNamedExports(node.exportClause)) {
|
|
let survivingExports: string[] = [];
|
|
for (const exportSpecifier of node.exportClause.elements) {
|
|
if (getColor(exportSpecifier) === NodeColor.Black) {
|
|
survivingExports.push(exportSpecifier.getFullText(sourceFile));
|
|
}
|
|
}
|
|
const leadingTriviaWidth = node.getLeadingTriviaWidth();
|
|
const leadingTrivia = sourceFile.text.substr(node.pos, leadingTriviaWidth);
|
|
if (survivingExports.length > 0) {
|
|
return write(`${leadingTrivia}export {${survivingExports.join(',')} } from${node.moduleSpecifier.getFullText(sourceFile)};`);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (shakeLevel === ShakeLevel.ClassMembers && (ts.isClassDeclaration(node) || ts.isInterfaceDeclaration(node)) && nodeOrChildIsBlack(node)) {
|
|
let toWrite = node.getFullText();
|
|
for (let i = node.members.length - 1; i >= 0; i--) {
|
|
const member = node.members[i];
|
|
if (getColor(member) === NodeColor.Black || !member.name) {
|
|
// keep method
|
|
continue;
|
|
}
|
|
|
|
let pos = member.pos - node.pos;
|
|
let end = member.end - node.pos;
|
|
toWrite = toWrite.substring(0, pos) + toWrite.substring(end);
|
|
}
|
|
return write(toWrite);
|
|
}
|
|
|
|
if (ts.isFunctionDeclaration(node)) {
|
|
// Do not go inside functions if they haven't been marked
|
|
return;
|
|
}
|
|
|
|
node.forEachChild(writeMarkedNodes);
|
|
}
|
|
|
|
if (getColor(sourceFile) !== NodeColor.Black) {
|
|
if (!nodeOrChildIsBlack(sourceFile)) {
|
|
// none of the elements are reachable => don't write this file at all!
|
|
return;
|
|
}
|
|
sourceFile.forEachChild(writeMarkedNodes);
|
|
result += sourceFile.endOfFileToken.getFullText(sourceFile);
|
|
} else {
|
|
result = text;
|
|
}
|
|
|
|
writeFile(destination, result);
|
|
});
|
|
|
|
return result;
|
|
}
|
|
|
|
//#endregion
|
|
|
|
//#region Utils
|
|
|
|
function isLocalCodeExtendingOrInheritingFromDefaultLibSymbol(program: ts.Program, checker: ts.TypeChecker, declaration: ts.ClassDeclaration | ts.InterfaceDeclaration): boolean {
|
|
if (!program.isSourceFileDefaultLibrary(declaration.getSourceFile()) && declaration.heritageClauses) {
|
|
for (const heritageClause of declaration.heritageClauses) {
|
|
for (const type of heritageClause.types) {
|
|
const symbol = findSymbolFromHeritageType(checker, type);
|
|
if (symbol) {
|
|
const decl = symbol.valueDeclaration || (symbol.declarations && symbol.declarations[0]);
|
|
if (decl && program.isSourceFileDefaultLibrary(decl.getSourceFile())) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function findSymbolFromHeritageType(checker: ts.TypeChecker, type: ts.ExpressionWithTypeArguments | ts.Expression | ts.PrivateIdentifier): ts.Symbol | null {
|
|
if (ts.isExpressionWithTypeArguments(type)) {
|
|
return findSymbolFromHeritageType(checker, type.expression);
|
|
}
|
|
if (ts.isIdentifier(type)) {
|
|
return getRealNodeSymbol(checker, type)[0];
|
|
}
|
|
if (ts.isPropertyAccessExpression(type)) {
|
|
return findSymbolFromHeritageType(checker, type.name);
|
|
}
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Returns the node's symbol and the `import` node (if the symbol resolved from a different module)
|
|
*/
|
|
function getRealNodeSymbol(checker: ts.TypeChecker, node: ts.Node): [ts.Symbol | null, ts.Declaration | null] {
|
|
|
|
// Use some TypeScript internals to avoid code duplication
|
|
type ObjectLiteralElementWithName = ts.ObjectLiteralElement & { name: ts.PropertyName; parent: ts.ObjectLiteralExpression | ts.JsxAttributes };
|
|
const getPropertySymbolsFromContextualType: (node: ObjectLiteralElementWithName, checker: ts.TypeChecker, contextualType: ts.Type, unionSymbolOk: boolean) => ReadonlyArray<ts.Symbol> = (<any>ts).getPropertySymbolsFromContextualType;
|
|
const getContainingObjectLiteralElement: (node: ts.Node) => ObjectLiteralElementWithName | undefined = (<any>ts).getContainingObjectLiteralElement;
|
|
const getNameFromPropertyName: (name: ts.PropertyName) => string | undefined = (<any>ts).getNameFromPropertyName;
|
|
|
|
// Go to the original declaration for cases:
|
|
//
|
|
// (1) when the aliased symbol was declared in the location(parent).
|
|
// (2) when the aliased symbol is originating from an import.
|
|
//
|
|
function shouldSkipAlias(node: ts.Node, declaration: ts.Node): boolean {
|
|
if (!ts.isShorthandPropertyAssignment(node) && node.kind !== ts.SyntaxKind.Identifier) {
|
|
return false;
|
|
}
|
|
if (node.parent === declaration) {
|
|
return true;
|
|
}
|
|
switch (declaration.kind) {
|
|
case ts.SyntaxKind.ImportClause:
|
|
case ts.SyntaxKind.ImportEqualsDeclaration:
|
|
return true;
|
|
case ts.SyntaxKind.ImportSpecifier:
|
|
return declaration.parent.kind === ts.SyntaxKind.NamedImports;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!ts.isShorthandPropertyAssignment(node)) {
|
|
if (node.getChildCount() !== 0) {
|
|
return [null, null];
|
|
}
|
|
}
|
|
|
|
const { parent } = node;
|
|
|
|
let symbol = (
|
|
ts.isShorthandPropertyAssignment(node)
|
|
? checker.getShorthandAssignmentValueSymbol(node)
|
|
: checker.getSymbolAtLocation(node)
|
|
);
|
|
|
|
let importNode: ts.Declaration | null = null;
|
|
// If this is an alias, and the request came at the declaration location
|
|
// get the aliased symbol instead. This allows for goto def on an import e.g.
|
|
// import {A, B} from "mod";
|
|
// to jump to the implementation directly.
|
|
if (symbol && symbol.flags & ts.SymbolFlags.Alias && shouldSkipAlias(node, symbol.declarations[0])) {
|
|
const aliased = checker.getAliasedSymbol(symbol);
|
|
if (aliased.declarations) {
|
|
// We should mark the import as visited
|
|
importNode = symbol.declarations[0];
|
|
symbol = aliased;
|
|
}
|
|
}
|
|
|
|
if (symbol) {
|
|
// Because name in short-hand property assignment has two different meanings: property name and property value,
|
|
// using go-to-definition at such position should go to the variable declaration of the property value rather than
|
|
// go to the declaration of the property name (in this case stay at the same position). However, if go-to-definition
|
|
// is performed at the location of property access, we would like to go to definition of the property in the short-hand
|
|
// assignment. This case and others are handled by the following code.
|
|
if (node.parent.kind === ts.SyntaxKind.ShorthandPropertyAssignment) {
|
|
symbol = checker.getShorthandAssignmentValueSymbol(symbol.valueDeclaration);
|
|
}
|
|
|
|
// If the node is the name of a BindingElement within an ObjectBindingPattern instead of just returning the
|
|
// declaration the symbol (which is itself), we should try to get to the original type of the ObjectBindingPattern
|
|
// and return the property declaration for the referenced property.
|
|
// For example:
|
|
// import('./foo').then(({ b/*goto*/ar }) => undefined); => should get use to the declaration in file "./foo"
|
|
//
|
|
// function bar<T>(onfulfilled: (value: T) => void) { //....}
|
|
// interface Test {
|
|
// pr/*destination*/op1: number
|
|
// }
|
|
// bar<Test>(({pr/*goto*/op1})=>{});
|
|
if (ts.isPropertyName(node) && ts.isBindingElement(parent) && ts.isObjectBindingPattern(parent.parent) &&
|
|
(node === (parent.propertyName || parent.name))) {
|
|
const name = getNameFromPropertyName(node);
|
|
const type = checker.getTypeAtLocation(parent.parent);
|
|
if (name && type) {
|
|
if (type.isUnion()) {
|
|
const prop = type.types[0].getProperty(name);
|
|
if (prop) {
|
|
symbol = prop;
|
|
}
|
|
} else {
|
|
const prop = type.getProperty(name);
|
|
if (prop) {
|
|
symbol = prop;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If the current location we want to find its definition is in an object literal, try to get the contextual type for the
|
|
// object literal, lookup the property symbol in the contextual type, and use this for goto-definition.
|
|
// For example
|
|
// interface Props{
|
|
// /*first*/prop1: number
|
|
// prop2: boolean
|
|
// }
|
|
// function Foo(arg: Props) {}
|
|
// Foo( { pr/*1*/op1: 10, prop2: false })
|
|
const element = getContainingObjectLiteralElement(node);
|
|
if (element) {
|
|
const contextualType = element && checker.getContextualType(element.parent);
|
|
if (contextualType) {
|
|
const propertySymbols = getPropertySymbolsFromContextualType(element, checker, contextualType, /*unionSymbolOk*/ false);
|
|
if (propertySymbols) {
|
|
symbol = propertySymbols[0];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (symbol && symbol.declarations) {
|
|
return [symbol, importNode];
|
|
}
|
|
|
|
return [null, null];
|
|
}
|
|
|
|
/** Get the token whose text contains the position */
|
|
function getTokenAtPosition(sourceFile: ts.SourceFile, position: number, allowPositionInLeadingTrivia: boolean, includeEndPosition: boolean): ts.Node {
|
|
let current: ts.Node = sourceFile;
|
|
outer: while (true) {
|
|
// find the child that contains 'position'
|
|
for (const child of current.getChildren()) {
|
|
const start = allowPositionInLeadingTrivia ? child.getFullStart() : child.getStart(sourceFile, /*includeJsDoc*/ true);
|
|
if (start > position) {
|
|
// If this child begins after position, then all subsequent children will as well.
|
|
break;
|
|
}
|
|
|
|
const end = child.getEnd();
|
|
if (position < end || (position === end && (child.kind === ts.SyntaxKind.EndOfFileToken || includeEndPosition))) {
|
|
current = child;
|
|
continue outer;
|
|
}
|
|
}
|
|
|
|
return current;
|
|
}
|
|
}
|
|
|
|
//#endregion
|