682 lines
18 KiB
TypeScript
682 lines
18 KiB
TypeScript
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/*---------------------------------------------------------------------------------------------
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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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import * as fs from 'fs';
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import * as path from 'path';
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import * as vm from 'vm';
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interface IPosition {
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line: number;
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col: number;
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}
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interface IBuildModuleInfo {
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id: string;
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path: string;
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defineLocation: IPosition | null;
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dependencies: string[];
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shim: string;
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exports: any;
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}
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interface IBuildModuleInfoMap {
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[moduleId: string]: IBuildModuleInfo;
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}
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interface ILoaderPlugin {
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write(pluginName: string, moduleName: string, write: ILoaderPluginWriteFunc): void;
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writeFile(pluginName: string, entryPoint: string, req: ILoaderPluginReqFunc, write: (filename: string, contents: string) => void, config: any): void;
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finishBuild(write: (filename: string, contents: string) => void): void;
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}
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interface ILoaderPluginWriteFunc {
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(something: string): void;
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getEntryPoint(): string;
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asModule(moduleId: string, code: string): void;
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}
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interface ILoaderPluginReqFunc {
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(something: string): void;
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toUrl(something: string): string;
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}
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export interface IExtraFile {
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path: string;
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amdModuleId?: string;
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}
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export interface IEntryPoint {
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name: string;
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include?: string[];
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exclude?: string[];
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/** @deprecated unsupported by ESM */
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prepend?: IExtraFile[];
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dest?: string;
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}
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interface IEntryPointMap {
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[moduleId: string]: IEntryPoint;
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}
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export interface IGraph {
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[node: string]: string[];
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}
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interface INodeSet {
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[node: string]: boolean;
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}
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export interface IFile {
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path: string | null;
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contents: string;
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}
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export interface IConcatFile {
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dest: string;
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sources: IFile[];
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}
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export interface IBundleData {
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graph: IGraph;
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bundles: { [moduleId: string]: string[] };
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}
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export interface IBundleResult {
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files: IConcatFile[];
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cssInlinedResources: string[];
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bundleData: IBundleData;
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}
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interface IPartialBundleResult {
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files: IConcatFile[];
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bundleData: IBundleData;
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}
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export interface ILoaderConfig {
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isBuild?: boolean;
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paths?: { [path: string]: any };
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/*
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* Normally, during a build, no module factories are invoked. This can be used
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* to forcefully execute a module's factory.
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*/
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buildForceInvokeFactory: {
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[moduleId: string]: boolean;
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};
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}
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/**
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* Bundle `entryPoints` given config `config`.
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*/
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export function bundle(entryPoints: IEntryPoint[], config: ILoaderConfig, callback: (err: any, result: IBundleResult | null) => void): void {
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const entryPointsMap: IEntryPointMap = {};
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entryPoints.forEach((module: IEntryPoint) => {
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if (entryPointsMap[module.name]) {
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throw new Error(`Cannot have two entry points with the same name '${module.name}'`);
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}
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entryPointsMap[module.name] = module;
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});
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const allMentionedModulesMap: { [modules: string]: boolean } = {};
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entryPoints.forEach((module: IEntryPoint) => {
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allMentionedModulesMap[module.name] = true;
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module.include?.forEach(function (includedModule) {
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allMentionedModulesMap[includedModule] = true;
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});
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module.exclude?.forEach(function (excludedModule) {
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allMentionedModulesMap[excludedModule] = true;
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});
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});
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const code = require('fs').readFileSync(path.join(__dirname, '../../src/vs/loader.js'));
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const r: Function = <any>vm.runInThisContext('(function(require, module, exports) { ' + code + '\n});');
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const loaderModule = { exports: {} };
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r.call({}, require, loaderModule, loaderModule.exports);
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const loader: any = loaderModule.exports;
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config.isBuild = true;
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config.paths = config.paths || {};
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if (!config.paths['vs/css']) {
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config.paths['vs/css'] = 'out-build/vs/css.build';
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}
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config.buildForceInvokeFactory = config.buildForceInvokeFactory || {};
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config.buildForceInvokeFactory['vs/css'] = true;
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loader.config(config);
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loader(['require'], (localRequire: any) => {
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const resolvePath = (entry: IExtraFile) => {
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let r = localRequire.toUrl(entry.path);
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if (!r.endsWith('.js')) {
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r += '.js';
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}
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// avoid packaging the build version of plugins:
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r = r.replace('vs/css.build.js', 'vs/css.js');
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return { path: r, amdModuleId: entry.amdModuleId };
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};
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for (const moduleId in entryPointsMap) {
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const entryPoint = entryPointsMap[moduleId];
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if (entryPoint.prepend) {
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entryPoint.prepend = entryPoint.prepend.map(resolvePath);
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}
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}
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});
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loader(Object.keys(allMentionedModulesMap), () => {
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const modules = <IBuildModuleInfo[]>loader.getBuildInfo();
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const partialResult = emitEntryPoints(modules, entryPointsMap);
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const cssInlinedResources = loader('vs/css').getInlinedResources();
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callback(null, {
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files: partialResult.files,
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cssInlinedResources: cssInlinedResources,
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bundleData: partialResult.bundleData
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});
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}, (err: any) => callback(err, null));
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}
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function emitEntryPoints(modules: IBuildModuleInfo[], entryPoints: IEntryPointMap): IPartialBundleResult {
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const modulesMap: IBuildModuleInfoMap = {};
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modules.forEach((m: IBuildModuleInfo) => {
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modulesMap[m.id] = m;
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});
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const modulesGraph: IGraph = {};
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modules.forEach((m: IBuildModuleInfo) => {
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modulesGraph[m.id] = m.dependencies;
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});
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const sortedModules = topologicalSort(modulesGraph);
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let result: IConcatFile[] = [];
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const usedPlugins: IPluginMap = {};
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const bundleData: IBundleData = {
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graph: modulesGraph,
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bundles: {}
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};
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Object.keys(entryPoints).forEach((moduleToBundle: string) => {
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const info = entryPoints[moduleToBundle];
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const rootNodes = [moduleToBundle].concat(info.include || []);
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const allDependencies = visit(rootNodes, modulesGraph);
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const excludes: string[] = ['require', 'exports', 'module'].concat(info.exclude || []);
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excludes.forEach((excludeRoot: string) => {
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const allExcludes = visit([excludeRoot], modulesGraph);
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Object.keys(allExcludes).forEach((exclude: string) => {
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delete allDependencies[exclude];
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});
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});
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const includedModules = sortedModules.filter((module: string) => {
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return allDependencies[module];
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});
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bundleData.bundles[moduleToBundle] = includedModules;
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const res = emitEntryPoint(
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modulesMap,
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modulesGraph,
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moduleToBundle,
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includedModules,
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info.prepend || [],
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info.dest
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);
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result = result.concat(res.files);
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for (const pluginName in res.usedPlugins) {
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usedPlugins[pluginName] = usedPlugins[pluginName] || res.usedPlugins[pluginName];
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}
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});
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Object.keys(usedPlugins).forEach((pluginName: string) => {
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const plugin = usedPlugins[pluginName];
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if (typeof plugin.finishBuild === 'function') {
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const write = (filename: string, contents: string) => {
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result.push({
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dest: filename,
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sources: [{
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path: null,
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contents: contents
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}]
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});
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};
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plugin.finishBuild(write);
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}
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});
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return {
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// TODO@TS 2.1.2
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files: extractStrings(removeAllDuplicateTSBoilerplate(result)),
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bundleData: bundleData
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};
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}
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function extractStrings(destFiles: IConcatFile[]): IConcatFile[] {
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const parseDefineCall = (moduleMatch: string, depsMatch: string) => {
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const module = moduleMatch.replace(/^"|"$/g, '');
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let deps = depsMatch.split(',');
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deps = deps.map((dep) => {
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dep = dep.trim();
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dep = dep.replace(/^"|"$/g, '');
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dep = dep.replace(/^'|'$/g, '');
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let prefix: string | null = null;
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let _path: string | null = null;
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const pieces = dep.split('!');
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if (pieces.length > 1) {
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prefix = pieces[0] + '!';
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_path = pieces[1];
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} else {
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prefix = '';
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_path = pieces[0];
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}
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if (/^\.\//.test(_path) || /^\.\.\//.test(_path)) {
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const res = path.join(path.dirname(module), _path).replace(/\\/g, '/');
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return prefix + res;
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}
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return prefix + _path;
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});
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return {
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module: module,
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deps: deps
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};
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};
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destFiles.forEach((destFile) => {
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if (!/\.js$/.test(destFile.dest)) {
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return;
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}
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if (/\.nls\.js$/.test(destFile.dest)) {
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return;
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}
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// Do one pass to record the usage counts for each module id
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const useCounts: { [moduleId: string]: number } = {};
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destFile.sources.forEach((source) => {
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const matches = source.contents.match(/define\(("[^"]+"),\s*\[(((, )?("|')[^"']+("|'))+)\]/);
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if (!matches) {
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return;
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}
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const defineCall = parseDefineCall(matches[1], matches[2]);
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useCounts[defineCall.module] = (useCounts[defineCall.module] || 0) + 1;
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defineCall.deps.forEach((dep) => {
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useCounts[dep] = (useCounts[dep] || 0) + 1;
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});
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});
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const sortedByUseModules = Object.keys(useCounts);
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sortedByUseModules.sort((a, b) => {
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return useCounts[b] - useCounts[a];
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});
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const replacementMap: { [moduleId: string]: number } = {};
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sortedByUseModules.forEach((module, index) => {
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replacementMap[module] = index;
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});
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destFile.sources.forEach((source) => {
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source.contents = source.contents.replace(/define\(("[^"]+"),\s*\[(((, )?("|')[^"']+("|'))+)\]/, (_, moduleMatch, depsMatch) => {
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const defineCall = parseDefineCall(moduleMatch, depsMatch);
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return `define(__m[${replacementMap[defineCall.module]}/*${defineCall.module}*/], __M([${defineCall.deps.map(dep => replacementMap[dep] + '/*' + dep + '*/').join(',')}])`;
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});
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});
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destFile.sources.unshift({
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path: null,
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contents: [
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'(function() {',
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`var __m = ${JSON.stringify(sortedByUseModules)};`,
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`var __M = function(deps) {`,
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` var result = [];`,
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` for (var i = 0, len = deps.length; i < len; i++) {`,
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` result[i] = __m[deps[i]];`,
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` }`,
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` return result;`,
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`};`
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].join('\n')
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});
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destFile.sources.push({
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path: null,
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contents: '}).call(this);'
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});
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});
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return destFiles;
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}
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function removeAllDuplicateTSBoilerplate(destFiles: IConcatFile[]): IConcatFile[] {
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destFiles.forEach((destFile) => {
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const SEEN_BOILERPLATE: boolean[] = [];
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destFile.sources.forEach((source) => {
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source.contents = removeDuplicateTSBoilerplate(source.contents, SEEN_BOILERPLATE);
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});
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});
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return destFiles;
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}
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export function removeAllTSBoilerplate(source: string) {
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const seen = new Array<boolean>(BOILERPLATE.length).fill(true, 0, 10);
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return removeDuplicateTSBoilerplate(source, seen);
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}
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// Taken from typescript compiler => emitFiles
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const BOILERPLATE = [
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{ start: /^var __extends/, end: /^}\)\(\);$/ },
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{ start: /^var __assign/, end: /^};$/ },
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{ start: /^var __decorate/, end: /^};$/ },
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{ start: /^var __metadata/, end: /^};$/ },
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{ start: /^var __param/, end: /^};$/ },
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{ start: /^var __awaiter/, end: /^};$/ },
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{ start: /^var __generator/, end: /^};$/ },
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{ start: /^var __createBinding/, end: /^}\)\);$/ },
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{ start: /^var __setModuleDefault/, end: /^}\);$/ },
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{ start: /^var __importStar/, end: /^};$/ },
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];
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function removeDuplicateTSBoilerplate(source: string, SEEN_BOILERPLATE: boolean[] = []): string {
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const lines = source.split(/\r\n|\n|\r/);
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||
|
|
const newLines: string[] = [];
|
||
|
|
let IS_REMOVING_BOILERPLATE = false, END_BOILERPLATE: RegExp;
|
||
|
|
|
||
|
|
for (let i = 0; i < lines.length; i++) {
|
||
|
|
const line = lines[i];
|
||
|
|
if (IS_REMOVING_BOILERPLATE) {
|
||
|
|
newLines.push('');
|
||
|
|
if (END_BOILERPLATE!.test(line)) {
|
||
|
|
IS_REMOVING_BOILERPLATE = false;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
for (let j = 0; j < BOILERPLATE.length; j++) {
|
||
|
|
const boilerplate = BOILERPLATE[j];
|
||
|
|
if (boilerplate.start.test(line)) {
|
||
|
|
if (SEEN_BOILERPLATE[j]) {
|
||
|
|
IS_REMOVING_BOILERPLATE = true;
|
||
|
|
END_BOILERPLATE = boilerplate.end;
|
||
|
|
} else {
|
||
|
|
SEEN_BOILERPLATE[j] = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (IS_REMOVING_BOILERPLATE) {
|
||
|
|
newLines.push('');
|
||
|
|
} else {
|
||
|
|
newLines.push(line);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return newLines.join('\n');
|
||
|
|
}
|
||
|
|
|
||
|
|
interface IPluginMap {
|
||
|
|
[moduleId: string]: ILoaderPlugin;
|
||
|
|
}
|
||
|
|
|
||
|
|
interface IEmitEntryPointResult {
|
||
|
|
files: IConcatFile[];
|
||
|
|
usedPlugins: IPluginMap;
|
||
|
|
}
|
||
|
|
|
||
|
|
function emitEntryPoint(
|
||
|
|
modulesMap: IBuildModuleInfoMap,
|
||
|
|
deps: IGraph,
|
||
|
|
entryPoint: string,
|
||
|
|
includedModules: string[],
|
||
|
|
prepend: IExtraFile[],
|
||
|
|
dest: string | undefined
|
||
|
|
): IEmitEntryPointResult {
|
||
|
|
if (!dest) {
|
||
|
|
dest = entryPoint + '.js';
|
||
|
|
}
|
||
|
|
const mainResult: IConcatFile = {
|
||
|
|
sources: [],
|
||
|
|
dest: dest
|
||
|
|
},
|
||
|
|
results: IConcatFile[] = [mainResult];
|
||
|
|
|
||
|
|
const usedPlugins: IPluginMap = {};
|
||
|
|
const getLoaderPlugin = (pluginName: string): ILoaderPlugin => {
|
||
|
|
if (!usedPlugins[pluginName]) {
|
||
|
|
usedPlugins[pluginName] = modulesMap[pluginName].exports;
|
||
|
|
}
|
||
|
|
return usedPlugins[pluginName];
|
||
|
|
};
|
||
|
|
|
||
|
|
includedModules.forEach((c: string) => {
|
||
|
|
const bangIndex = c.indexOf('!');
|
||
|
|
|
||
|
|
if (bangIndex >= 0) {
|
||
|
|
const pluginName = c.substr(0, bangIndex);
|
||
|
|
const plugin = getLoaderPlugin(pluginName);
|
||
|
|
mainResult.sources.push(emitPlugin(entryPoint, plugin, pluginName, c.substr(bangIndex + 1)));
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const module = modulesMap[c];
|
||
|
|
|
||
|
|
if (module.path === 'empty:') {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const contents = readFileAndRemoveBOM(module.path);
|
||
|
|
|
||
|
|
if (module.shim) {
|
||
|
|
mainResult.sources.push(emitShimmedModule(c, deps[c], module.shim, module.path, contents));
|
||
|
|
} else if (module.defineLocation) {
|
||
|
|
mainResult.sources.push(emitNamedModule(c, module.defineLocation, module.path, contents));
|
||
|
|
} else {
|
||
|
|
const moduleCopy = {
|
||
|
|
id: module.id,
|
||
|
|
path: module.path,
|
||
|
|
defineLocation: module.defineLocation,
|
||
|
|
dependencies: module.dependencies
|
||
|
|
};
|
||
|
|
throw new Error(`Cannot bundle module '${module.id}' for entry point '${entryPoint}' because it has no shim and it lacks a defineLocation: ${JSON.stringify(moduleCopy)}`);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
Object.keys(usedPlugins).forEach((pluginName: string) => {
|
||
|
|
const plugin = usedPlugins[pluginName];
|
||
|
|
if (typeof plugin.writeFile === 'function') {
|
||
|
|
const req: ILoaderPluginReqFunc = <any>(() => {
|
||
|
|
throw new Error('no-no!');
|
||
|
|
});
|
||
|
|
req.toUrl = something => something;
|
||
|
|
|
||
|
|
const write = (filename: string, contents: string) => {
|
||
|
|
results.push({
|
||
|
|
dest: filename,
|
||
|
|
sources: [{
|
||
|
|
path: null,
|
||
|
|
contents: contents
|
||
|
|
}]
|
||
|
|
});
|
||
|
|
};
|
||
|
|
plugin.writeFile(pluginName, entryPoint, req, write, {});
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
const toIFile = (entry: IExtraFile): IFile => {
|
||
|
|
let contents = readFileAndRemoveBOM(entry.path);
|
||
|
|
if (entry.amdModuleId) {
|
||
|
|
contents = contents.replace(/^define\(/m, `define("${entry.amdModuleId}",`);
|
||
|
|
}
|
||
|
|
return {
|
||
|
|
path: entry.path,
|
||
|
|
contents: contents
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
const toPrepend = (prepend || []).map(toIFile);
|
||
|
|
|
||
|
|
mainResult.sources = toPrepend.concat(mainResult.sources);
|
||
|
|
|
||
|
|
return {
|
||
|
|
files: results,
|
||
|
|
usedPlugins: usedPlugins
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
function readFileAndRemoveBOM(path: string): string {
|
||
|
|
const BOM_CHAR_CODE = 65279;
|
||
|
|
let contents = fs.readFileSync(path, 'utf8');
|
||
|
|
// Remove BOM
|
||
|
|
if (contents.charCodeAt(0) === BOM_CHAR_CODE) {
|
||
|
|
contents = contents.substring(1);
|
||
|
|
}
|
||
|
|
return contents;
|
||
|
|
}
|
||
|
|
|
||
|
|
function emitPlugin(entryPoint: string, plugin: ILoaderPlugin, pluginName: string, moduleName: string): IFile {
|
||
|
|
let result = '';
|
||
|
|
if (typeof plugin.write === 'function') {
|
||
|
|
const write: ILoaderPluginWriteFunc = <any>((what: string) => {
|
||
|
|
result += what;
|
||
|
|
});
|
||
|
|
write.getEntryPoint = () => {
|
||
|
|
return entryPoint;
|
||
|
|
};
|
||
|
|
write.asModule = (moduleId: string, code: string) => {
|
||
|
|
code = code.replace(/^define\(/, 'define("' + moduleId + '",');
|
||
|
|
result += code;
|
||
|
|
};
|
||
|
|
plugin.write(pluginName, moduleName, write);
|
||
|
|
}
|
||
|
|
return {
|
||
|
|
path: null,
|
||
|
|
contents: result
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
function emitNamedModule(moduleId: string, defineCallPosition: IPosition, path: string, contents: string): IFile {
|
||
|
|
|
||
|
|
// `defineCallPosition` is the position in code: |define()
|
||
|
|
const defineCallOffset = positionToOffset(contents, defineCallPosition.line, defineCallPosition.col);
|
||
|
|
|
||
|
|
// `parensOffset` is the position in code: define|()
|
||
|
|
const parensOffset = contents.indexOf('(', defineCallOffset);
|
||
|
|
|
||
|
|
const insertStr = '"' + moduleId + '", ';
|
||
|
|
|
||
|
|
return {
|
||
|
|
path: path,
|
||
|
|
contents: contents.substr(0, parensOffset + 1) + insertStr + contents.substr(parensOffset + 1)
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
function emitShimmedModule(moduleId: string, myDeps: string[], factory: string, path: string, contents: string): IFile {
|
||
|
|
const strDeps = (myDeps.length > 0 ? '"' + myDeps.join('", "') + '"' : '');
|
||
|
|
const strDefine = 'define("' + moduleId + '", [' + strDeps + '], ' + factory + ');';
|
||
|
|
return {
|
||
|
|
path: path,
|
||
|
|
contents: contents + '\n;\n' + strDefine
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Convert a position (line:col) to (offset) in string `str`
|
||
|
|
*/
|
||
|
|
function positionToOffset(str: string, desiredLine: number, desiredCol: number): number {
|
||
|
|
if (desiredLine === 1) {
|
||
|
|
return desiredCol - 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
let line = 1;
|
||
|
|
let lastNewLineOffset = -1;
|
||
|
|
|
||
|
|
do {
|
||
|
|
if (desiredLine === line) {
|
||
|
|
return lastNewLineOffset + 1 + desiredCol - 1;
|
||
|
|
}
|
||
|
|
lastNewLineOffset = str.indexOf('\n', lastNewLineOffset + 1);
|
||
|
|
line++;
|
||
|
|
} while (lastNewLineOffset >= 0);
|
||
|
|
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return a set of reachable nodes in `graph` starting from `rootNodes`
|
||
|
|
*/
|
||
|
|
function visit(rootNodes: string[], graph: IGraph): INodeSet {
|
||
|
|
const result: INodeSet = {};
|
||
|
|
const queue = rootNodes;
|
||
|
|
|
||
|
|
rootNodes.forEach((node) => {
|
||
|
|
result[node] = true;
|
||
|
|
});
|
||
|
|
|
||
|
|
while (queue.length > 0) {
|
||
|
|
const el = queue.shift();
|
||
|
|
const myEdges = graph[el!] || [];
|
||
|
|
myEdges.forEach((toNode) => {
|
||
|
|
if (!result[toNode]) {
|
||
|
|
result[toNode] = true;
|
||
|
|
queue.push(toNode);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Perform a topological sort on `graph`
|
||
|
|
*/
|
||
|
|
function topologicalSort(graph: IGraph): string[] {
|
||
|
|
|
||
|
|
const allNodes: INodeSet = {},
|
||
|
|
outgoingEdgeCount: { [node: string]: number } = {},
|
||
|
|
inverseEdges: IGraph = {};
|
||
|
|
|
||
|
|
Object.keys(graph).forEach((fromNode: string) => {
|
||
|
|
allNodes[fromNode] = true;
|
||
|
|
outgoingEdgeCount[fromNode] = graph[fromNode].length;
|
||
|
|
|
||
|
|
graph[fromNode].forEach((toNode) => {
|
||
|
|
allNodes[toNode] = true;
|
||
|
|
outgoingEdgeCount[toNode] = outgoingEdgeCount[toNode] || 0;
|
||
|
|
|
||
|
|
inverseEdges[toNode] = inverseEdges[toNode] || [];
|
||
|
|
inverseEdges[toNode].push(fromNode);
|
||
|
|
});
|
||
|
|
});
|
||
|
|
|
||
|
|
// https://en.wikipedia.org/wiki/Topological_sorting
|
||
|
|
const S: string[] = [],
|
||
|
|
L: string[] = [];
|
||
|
|
|
||
|
|
Object.keys(allNodes).forEach((node: string) => {
|
||
|
|
if (outgoingEdgeCount[node] === 0) {
|
||
|
|
delete outgoingEdgeCount[node];
|
||
|
|
S.push(node);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
while (S.length > 0) {
|
||
|
|
// Ensure the exact same order all the time with the same inputs
|
||
|
|
S.sort();
|
||
|
|
|
||
|
|
const n: string = S.shift()!;
|
||
|
|
L.push(n);
|
||
|
|
|
||
|
|
const myInverseEdges = inverseEdges[n] || [];
|
||
|
|
myInverseEdges.forEach((m: string) => {
|
||
|
|
outgoingEdgeCount[m]--;
|
||
|
|
if (outgoingEdgeCount[m] === 0) {
|
||
|
|
delete outgoingEdgeCount[m];
|
||
|
|
S.push(m);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
if (Object.keys(outgoingEdgeCount).length > 0) {
|
||
|
|
throw new Error('Cannot do topological sort on cyclic graph, remaining nodes: ' + Object.keys(outgoingEdgeCount));
|
||
|
|
}
|
||
|
|
|
||
|
|
return L;
|
||
|
|
}
|