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  • Angular 调试

    我们新建一个项目。执行 ng server 会启动一个网站。

    1. 执行 where ng 。看看ng 是什么.

    D:Abp学习angularMytest>where ng
    C:UsersQiGongboAppDataRoaming
    pm
    g
    C:UsersQiGongboAppDataRoaming
    pm
    g.cmd

    实际执行到了ng.cmd:

    @IF EXIST "%~dp0
    ode.exe" (    # C:UsersQiGongboAppDataRoaming
    pm
    ode_modules@angularcliin
    g
      "%~dp0
    ode.exe"  "%~dp0
    ode_modules@angularcliin
    g" %*
    ) ELSE (
      @SETLOCAL
      @SET PATHEXT=%PATHEXT:;.JS;=;%
      node  "%~dp0
    ode_modules@angularcliin
    g" %*
    )

    这个 ng 是个JS文件。 文件是这样的:

    #!/usr/bin/env node
    'use strict';
    
    // Provide a title to the process in `ps`.
    // Due to an obscure Mac bug, do not start this title with any symbol.
    console.log(process);
    try {
      process.title = 'ng ' + Array.from(process.argv).slice(2).join(' ');
    } catch(_) {
      // If an error happened above, use the most basic title.
      process.title = 'ng';
    }
    
    // Some older versions of Node do not support let or const.
    var version = process.version.substr(1).split('.');
    if (Number(version[0]) < 8 || (Number(version[0]) === 8 && Number(version[1]) < 9)) {
      process.stderr.write(
        'You are running version ' + process.version + ' of Node.js, which is not supported by Angular CLI v6.
    ' +
        'The official Node.js version that is supported is 8.9 and greater.
    
    ' +
        'Please visit https://nodejs.org/en/ to find instructions on how to update Node.js.
    '
      );
    
      process.exit(3);
    }
    
    require('../lib/init');
    View Code

    最后引用了  require('../lib/init');

    init.js 如下:

    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    /**
     * @license
     * Copyright Google Inc. All Rights Reserved.
     *
     * Use of this source code is governed by an MIT-style license that can be
     * found in the LICENSE file at https://angular.io/license
     */
    require("symbol-observable");
    // symbol polyfill must go first
    // tslint:disable-next-line:ordered-imports import-groups
    const core_1 = require("@angular-devkit/core");
    const node_1 = require("@angular-devkit/core/node");
    const fs = require("fs");
    const path = require("path");
    const semver_1 = require("semver");
    const stream_1 = require("stream");
    const config_1 = require("../utilities/config");
    const packageJson = require('../package.json');
    function _fromPackageJson(cwd) {
        cwd = cwd || process.cwd();
        do {
            const packageJsonPath = path.join(cwd, 'node_modules/@angular/cli/package.json');
            if (fs.existsSync(packageJsonPath)) {
                const content = fs.readFileSync(packageJsonPath, 'utf-8');
                if (content) {
                    const json = JSON.parse(content);
                    if (json['version']) {
                        return new semver_1.SemVer(json['version']);
                    }
                }
            }
            // Check the parent.
            cwd = path.dirname(cwd);
        } while (cwd != path.dirname(cwd));
        return null;
    }
    // Check if we need to profile this CLI run.
    if (process.env['NG_CLI_PROFILING']) {
        let profiler;
        try {
            profiler = require('v8-profiler-node8'); // tslint:disable-line:no-implicit-dependencies
        }
        catch (err) {
            throw new Error(`Could not require 'v8-profiler-node8'. You must install it separetely with` +
                `'npm install v8-profiler-node8 --no-save.
    
    Original error:
    
    ${err}`);
        }
        profiler.startProfiling();
        const exitHandler = (options) => {
            if (options.cleanup) {
                const cpuProfile = profiler.stopProfiling();
                fs.writeFileSync(path.resolve(process.cwd(), process.env.NG_CLI_PROFILING || '') + '.cpuprofile', JSON.stringify(cpuProfile));
            }
            if (options.exit) {
                process.exit();
            }
        };
        process.on('exit', () => exitHandler({ cleanup: true }));
        process.on('SIGINT', () => exitHandler({ exit: true }));
        process.on('uncaughtException', () => exitHandler({ exit: true }));
    }
    let cli;
    try {
        const projectLocalCli = node_1.resolve('@angular/cli', {
            checkGlobal: false,
            basedir: process.cwd(),
            preserveSymlinks: true,
        });
        // This was run from a global, check local version.
        const globalVersion = new semver_1.SemVer(packageJson['version']);
        let localVersion;
        let shouldWarn = false;
        try {
            localVersion = _fromPackageJson();
            shouldWarn = localVersion != null && globalVersion.compare(localVersion) > 0;
        }
        catch (e) {
            // eslint-disable-next-line no-console
            console.error(e);
            shouldWarn = true;
        }
        if (shouldWarn && config_1.isWarningEnabled('versionMismatch')) {
            const warning = core_1.terminal.yellow(core_1.tags.stripIndents `
        Your global Angular CLI version (${globalVersion}) is greater than your local
        version (${localVersion}). The local Angular CLI version is used.
    
        To disable this warning use "ng config -g cli.warnings.versionMismatch false".
        `);
            // Don't show warning colorised on `ng completion`
            if (process.argv[2] !== 'completion') {
                // eslint-disable-next-line no-console
                console.error(warning);
            }
            else {
                // eslint-disable-next-line no-console
                console.error(warning);
                process.exit(1);
            }
        }
        // No error implies a projectLocalCli, which will load whatever
        // version of ng-cli you have installed in a local package.json
        cli = require(projectLocalCli);
    }
    catch (_a) {
        // If there is an error, resolve could not find the ng-cli
        // library from a package.json. Instead, include it from a relative
        // path to this script file (which is likely a globally installed
        // npm package). Most common cause for hitting this is `ng new`
        cli = require('./cli');
    }
    if ('default' in cli) {
        cli = cli['default'];
    }
    // This is required to support 1.x local versions with a 6+ global
    let standardInput;
    try {
        standardInput = process.stdin;
    }
    catch (e) {
        delete process.stdin;
        process.stdin = new stream_1.Duplex();
        standardInput = process.stdin;
    }
    cli({
        cliArgs: process.argv.slice(2),
        inputStream: standardInput,
        outputStream: process.stdout,
    })
        .then((exitCode) => {
        process.exit(exitCode);
    })
        .catch((err) => {
        console.error('Unknown error: ' + err.toString());
        process.exit(127);
    });
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All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\nimport 'symbol-observable';\n// symbol polyfill must go first\n// tslint:disable-next-line:ordered-imports import-groups\nimport { tags, terminal } from '@angular-devkit/core';\nimport { resolve } from '@angular-devkit/core/node';\nimport * as fs from 'fs';\nimport * as path from 'path';\nimport { SemVer } from 'semver';\nimport { Duplex } from 'stream';\nimport { isWarningEnabled } from '../utilities/config';\n\nconst packageJson = require('../package.json');\n\nfunction _fromPackageJson(cwd?: string) {\n  cwd = cwd || process.cwd();\n\n  do {\n    const packageJsonPath = path.join(cwd, 'node_modules/@angular/cli/package.json');\n    if (fs.existsSync(packageJsonPath)) {\n      const content = fs.readFileSync(packageJsonPath, 'utf-8');\n      if (content) {\n        const json = JSON.parse(content);\n        if (json['version']) {\n          return new SemVer(json['version']);\n        }\n      }\n    }\n\n    // Check the parent.\n    cwd = path.dirname(cwd);\n  } while (cwd != path.dirname(cwd));\n\n  return null;\n}\n\n\n// Check if we need to profile this CLI run.\nif (process.env['NG_CLI_PROFILING']) {\n  let profiler: {\n    startProfiling: (name?: string, recsamples?: boolean) => void;\n    stopProfiling: (name?: string) => any; // tslint:disable-line:no-any\n  };\n  try {\n    profiler = require('v8-profiler-node8'); // tslint:disable-line:no-implicit-dependencies\n  } catch (err) {\n    throw new Error(`Could not require 'v8-profiler-node8'. You must install it separetely with` +\n      `'npm install v8-profiler-node8 --no-save.\\n\\nOriginal error:\\n\\n${err}`);\n  }\n\n  profiler.startProfiling();\n\n  const exitHandler = (options: { cleanup?: boolean, exit?: boolean }) => {\n    if (options.cleanup) {\n      const cpuProfile = profiler.stopProfiling();\n      fs.writeFileSync(\n        path.resolve(process.cwd(), process.env.NG_CLI_PROFILING || '') + '.cpuprofile',\n        JSON.stringify(cpuProfile),\n      );\n    }\n\n    if (options.exit) {\n      process.exit();\n    }\n  };\n\n  process.on('exit', () => exitHandler({ cleanup: true }));\n  process.on('SIGINT', () => exitHandler({ exit: true }));\n  process.on('uncaughtException', () => exitHandler({ exit: true }));\n}\n\nlet cli;\ntry {\n  const projectLocalCli = resolve(\n    '@angular/cli',\n    {\n      checkGlobal: false,\n      basedir: process.cwd(),\n      preserveSymlinks: true,\n    },\n  );\n\n  // This was run from a global, check local version.\n  const globalVersion = new SemVer(packageJson['version']);\n  let localVersion;\n  let shouldWarn = false;\n\n  try {\n    localVersion = _fromPackageJson();\n    shouldWarn = localVersion != null && globalVersion.compare(localVersion) > 0;\n  } catch (e) {\n    // eslint-disable-next-line no-console\n    console.error(e);\n    shouldWarn = true;\n  }\n\n  if (shouldWarn && isWarningEnabled('versionMismatch')) {\n    const warning = terminal.yellow(tags.stripIndents`\n    Your global Angular CLI version (${globalVersion}) is greater than your local\n    version (${localVersion}). The local Angular CLI version is used.\n\n    To disable this warning use \"ng config -g cli.warnings.versionMismatch false\".\n    `);\n    // Don't show warning colorised on `ng completion`\n    if (process.argv[2] !== 'completion') {\n        // eslint-disable-next-line no-console\n      console.error(warning);\n    } else {\n        // eslint-disable-next-line no-console\n      console.error(warning);\n      process.exit(1);\n    }\n  }\n\n  // No error implies a projectLocalCli, which will load whatever\n  // version of ng-cli you have installed in a local package.json\n  cli = require(projectLocalCli);\n} catch {\n  // If there is an error, resolve could not find the ng-cli\n  // library from a package.json. Instead, include it from a relative\n  // path to this script file (which is likely a globally installed\n  // npm package). Most common cause for hitting this is `ng new`\n  cli = require('./cli');\n}\n\nif ('default' in cli) {\n  cli = cli['default'];\n}\n\n// This is required to support 1.x local versions with a 6+ global\nlet standardInput;\ntry {\n  standardInput = process.stdin;\n} catch (e) {\n  delete process.stdin;\n  process.stdin = new Duplex();\n  standardInput = process.stdin;\n}\n\ncli({\n  cliArgs: process.argv.slice(2),\n  inputStream: standardInput,\n  outputStream: process.stdout,\n})\n  .then((exitCode: number) => {\n    process.exit(exitCode);\n  })\n  .catch((err: Error) => {\n    console.error('Unknown error: ' + err.toString());\n    process.exit(127);\n  });\n"]}
    View Code
    气功波(18037675651)
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  • 原文地址:https://www.cnblogs.com/qgbo/p/11635697.html
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