Question

我正在使用Karma-Webpack来运行我的Angular 2规范。

https://github.com/webpack/karma-webpack

当我在Chrome中使用karma执行测试时，我的规范的源文件在调试器中看起来是可读的。但是，受测试的系统文件（我的应用程序源）是不可读的。

我正在使用karma-sourcemap-loader并按照指示将devtool设置为'inline-source-map'。可能导致这个问题的原因是什么？

此构建是在AngularClass angular2-webpack-starter之后建模的。 https://github.com/AngularClass/angular2-webpack-starter

调试器中的Spec文件：

调试器中的SUT文件：

webpack.test.js

const helpers = require('./helpers');

/**
 * Webpack Plugins
 */
const ProvidePlugin = require('webpack/lib/ProvidePlugin');
const DefinePlugin = require('webpack/lib/DefinePlugin');

/**
 * Webpack Constants
 */
const ENV = process.env.ENV = process.env.NODE_ENV = 'test';

/**
 * Webpack configuration
 *
 * See: http://webpack.github.io/docs/configuration.html#cli
 */
module.exports = {

  /**
   * Source map for Karma from the help of karma-sourcemap-loader &  karma-webpack
   *
   * Do not change, leave as is or it wont work.
   * See: https://github.com/webpack/karma-webpack#source-maps
   */
  devtool: 'inline-source-map',

  /**
   * Options affecting the resolving of modules.
   *
   * See: http://webpack.github.io/docs/configuration.html#resolve
   */
  resolve: {

    /**
     * An array of extensions that should be used to resolve modules.
     *
     * See: http://webpack.github.io/docs/configuration.html#resolve-extensions
     */
    extensions: ['', '.ts', '.js'],

    /**
     * Make sure root is src
     */
    root: helpers.root('src'),

  },


  /**
   * Options affecting the normal modules.
   *
   * See: http://webpack.github.io/docs/configuration.html#module
   */
  module: {

    /**
     * An array of applied pre and post loaders.
     *
     * See: http://webpack.github.io/docs/configuration.html#module-preloaders-module-postloaders
     */
    preLoaders: [

      /**
       * Tslint loader support for *.ts files
       *
       * See: https://github.com/wbuchwalter/tslint-loader
       */
      {
        test: /\.ts$/,
        loader: 'tslint-loader',
        exclude: [helpers.root('node_modules')]
      },

      /**
       * Source map loader support for *.js files
       * Extracts SourceMaps for source files that as added as sourceMappingURL comment.
       *
       * See: https://github.com/webpack/source-map-loader
       */
      {
        test: /\.js$/,
        loader: 'source-map-loader',
        exclude: [
        // these packages have problems with their sourcemaps
        helpers.root('node_modules/rxjs'),
        helpers.root('node_modules/@angular')
        ]
      }

    ],

    /**
     * An array of automatically applied loaders.
     *
     * IMPORTANT: The loaders here are resolved relative to the resource which they are applied to.
     * This means they are not resolved relative to the configuration file.
     *
     * See: http://webpack.github.io/docs/configuration.html#module-loaders
     */
    loaders: [

      /**
       * Typescript loader support for .ts and Angular 2 async routes via .async.ts
       *
       * See: https://github.com/s-panferov/awesome-typescript-loader
       */
      {
        test: /\.ts$/,
        loader: 'awesome-typescript-loader',
        query: {
          compilerOptions: {

            // Remove TypeScript helpers to be injected
            // below by DefinePlugin
            removeComments: true

          }
        },
        exclude: [/\.e2e\.ts$/]
      },

      /**
       * Json loader support for *.json files.
       *
       * See: https://github.com/webpack/json-loader
       */
      { test: /\.json$/, loader: 'json-loader', exclude: [helpers.root('src/index.html')] },

      /**
       * Raw loader support for *.css files
       * Returns file content as string
       *
       * See: https://github.com/webpack/raw-loader
       */
      { test: /\.css$/, loaders: ['to-string-loader', 'css-loader'], exclude: [helpers.root('src/index.html')] },

      /**
       * Raw loader support for *.html
       * Returns file content as string
       *
       * See: https://github.com/webpack/raw-loader
       */
      { test: /\.html$/, loader: 'raw-loader', exclude: [helpers.root('src/index.html')] }

    ],

    /**
     * An array of applied pre and post loaders.
     *
     * See: http://webpack.github.io/docs/configuration.html#module-preloaders-module-postloaders
     */
    postLoaders: [

      /**
       * Instruments JS files with Istanbul for subsequent code coverage reporting.
       * Instrument only testing sources.
       *
       * See: https://github.com/deepsweet/istanbul-instrumenter-loader
       */
      {
        test: /\.(js|ts)$/, loader: 'istanbul-instrumenter-loader',
        include: helpers.root('src'),
        exclude: [
          /\.(e2e|spec)\.ts$/,
          /node_modules/
        ]
      }

    ]
  },

  /**
   * Add additional plugins to the compiler.
   *
   * See: http://webpack.github.io/docs/configuration.html#plugins
   */
  plugins: [

    /**
     * Plugin: DefinePlugin
     * Description: Define free variables.
     * Useful for having development builds with debug logging or adding global constants.
     *
     * Environment helpers
     *
     * See: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
     */
    // NOTE: when adding more properties make sure you include them in custom-typings.d.ts
    new DefinePlugin({
      'ENV': JSON.stringify(ENV),
      'HMR': false,
      'process.env': {
        'ENV': JSON.stringify(ENV),
        'NODE_ENV': JSON.stringify(ENV),
        'HMR': false,
      }
    }),


  ],

  /**
   * Static analysis linter for TypeScript advanced options configuration
   * Description: An extensible linter for the TypeScript language.
   *
   * See: https://github.com/wbuchwalter/tslint-loader
   */
  tslint: {
    emitErrors: false,
    failOnHint: false,
    resourcePath: 'src'
  },

  /**
   * Include polyfills or mocks for various node stuff
   * Description: Node configuration
   *
   * See: https://webpack.github.io/docs/configuration.html#node
   */
  node: {
    global: 'window',
    process: false,
    crypto: 'empty',
    module: false,
    clearImmediate: false,
    setImmediate: false
  }

};

karma.conf.js

/**
 * @author: @AngularClass
 */

module.exports = function (config) {
  var testWebpackConfig = require('./webpack.test.js');

  var configuration = {

    // base path that will be used to resolve all patterns (e.g. files, exclude)
    basePath: '',

    /*
     * Frameworks to use
     *
     * available frameworks: https://npmjs.org/browse/keyword/karma-adapter
     */
    frameworks: ['jasmine'],

    // list of files to exclude
    exclude: [],

    /*
     * list of files / patterns to load in the browser
     *
     * we are building the test environment in ./spec-bundle.js
     */

    files: [{ pattern: './spec-bundle.js', watched: false }],

    /*
     * preprocess matching files before serving them to the browser
     * available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
     */
    preprocessors: {
      './spec-bundle.js': ['coverage', 'webpack', 'sourcemap']
    },

    // Webpack Config at ./webpack.test.js
    webpack: testWebpackConfig,

    coverageReporter: {
      dir: './../karma_html/coverage/',
      reporters: [
        { type: 'text-summary' },
        { type: 'json' },
        { type: 'html' }
      ]
    },

    // Webpack please don't spam the console when running in karma!
    webpackServer: { noInfo: true },

    /*
     * test results reporter to use
     *
     * possible values: 'dots', 'progress'
     * available reporters: https://npmjs.org/browse/keyword/karma-reporter
     */
    reporters: ['mocha', 'coverage'],

    // web server port
    port: 9876,

    // enable / disable colors in the output (reporters and logs)
    colors: true,

    /*
     * level of logging
     * possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
     */
    logLevel: config.LOG_INFO,

    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: false,

    /*
     * start these browsers
     * available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
     */
    browsers: [
      'PhantomJS'
    ],

    customLaunchers: {
      Chrome_travis_ci: {
        base: 'Chrome',
        flags: ['--no-sandbox']
      }
    },

    /*
     * Continuous Integration mode
     * if true, Karma captures browsers, runs the tests and exits
     */
    singleRun: true
  };

  if (process.env.TRAVIS) {
    configuration.browsers = ['Chrome_travis_ci'];
  }

  config.set(configuration);
};

SPEC-bundle.js

/**
 * @author: @AngularClass
 */

/*
 * When testing with webpack and ES6, we have to do some extra
 * things to get testing to work right. Because we are gonna write tests
 * in ES6 too, we have to compile those as well. That's handled in
 * karma.conf.js with the karma-webpack plugin. This is the entry
 * file for webpack test. Just like webpack will create a bundle.js
 * file for our client, when we run test, it will compile and bundle them
 * all here! Crazy huh. So we need to do some setup
 */
Error.stackTraceLimit = Infinity;

require('core-js/es6');
require('core-js/es7/reflect');

// Typescript emit helpers polyfill
require('ts-helpers');

require('zone.js/dist/zone');
require('zone.js/dist/long-stack-trace-zone');
require('zone.js/dist/jasmine-patch');
require('zone.js/dist/async-test');
require('zone.js/dist/fake-async-test');
require('zone.js/dist/sync-test');

// RxJS
require('rxjs/Rx');

var testing = require('@angular/core/testing');
var browser = require('@angular/platform-browser-dynamic/testing');

testing.setBaseTestProviders(
  browser.TEST_BROWSER_DYNAMIC_PLATFORM_PROVIDERS,
  browser.TEST_BROWSER_DYNAMIC_APPLICATION_PROVIDERS
);

/*
 * Ok, this is kinda crazy. We can use the the context method on
 * require that webpack created in order to tell webpack
 * what files we actually want to require or import.
 * Below, context will be an function/object with file names as keys.
 * using that regex we are saying look in ./src/app and ./test then find
 * any file that ends with spec.js and get its path. By passing in true
 * we say do this recursively
 */
var testContext = require.context('../src', true, /\.spec\.ts/);

/*
 * get all the files, for each file, call the context function
 * that will require the file and load it up here. Context will
 * loop and require those spec files here
 */
function requireAll(requireContext) {
  return requireContext.keys().map(requireContext);
}

// requires and returns all modules that match
var modules = requireAll(testContext);

Answer 1

问题来自istanbul-instrumenter-loader。

一种解决方案是在监视模式下运行测试时配置karma和webpack以跳过代码覆盖率检测。

根据angular2-webpack-starter repo中的最新版本，您可以修改以下2个文件：

karma.conf.js

/**
 * @author: @AngularClass
 */

const autowatch = process.env.npm_lifecycle_script.indexOf('--auto-watch') !== -1;

module.exports = function(config) {
  var testWebpackConfig = require('./webpack.test.js')({env: 'test'});

  var configuration = {

    // base path that will be used to resolve all patterns (e.g. files, exclude)
    basePath: '',

    /*
     * Frameworks to use
     *
     * available frameworks: https://npmjs.org/browse/keyword/karma-adapter
     */
    frameworks: ['jasmine'],

    // list of files to exclude
    exclude: [ ],

    /*
     * list of files / patterns to load in the browser
     *
     * we are building the test environment in ./spec-bundle.js
     */
    files: [ { pattern: './config/spec-bundle.js', watched: false } ],

    /*
     * preprocess matching files before serving them to the browser
     * available preprocessors: https://npmjs.org/browse/keyword/karma-preprocessor
     */
    // skip coverage in watch mode
    preprocessors: { './config/spec-bundle.js': autowatch ? ['webpack', 'sourcemap'] : ['coverage', 'webpack', 'sourcemap'] },

    // Webpack Config at ./webpack.test.js
    webpack: testWebpackConfig,

    // Webpack please don't spam the console when running in karma!
    webpackServer: { noInfo: true },

    /*
     * test results reporter to use
     *
     * possible values: 'dots', 'progress'
     * available reporters: https://npmjs.org/browse/keyword/karma-reporter
     */
    reporters: [ 'mocha'],

    // web server port
    port: 9876,

    // enable / disable colors in the output (reporters and logs)
    colors: true,

    /*
     * level of logging
     * possible values: config.LOG_DISABLE || config.LOG_ERROR || config.LOG_WARN || config.LOG_INFO || config.LOG_DEBUG
     */
    logLevel: config.LOG_INFO,

    // enable / disable watching file and executing tests whenever any file changes
    autoWatch: false,

    /*
     * start these browsers
     * available browser launchers: https://npmjs.org/browse/keyword/karma-launcher
     */
    browsers: [
      'Chrome'
    ],

    customLaunchers: {
      ChromeTravisCi: {
        base: 'Chrome',
        flags: ['--no-sandbox']
      }
    },

    /*
     * Continuous Integration mode
     * if true, Karma captures browsers, runs the tests and exits
     */
    singleRun: true
  };

  if (process.env.TRAVIS){
    configuration.browsers = ['ChromeTravisCi'];
  }

  // skip coverage in watch mode
  if (!autowatch) {
      configuration.reporters.push('coverage');
      configuration.coverageReporter = {
      dir : 'coverage/',
      reporters: [
        { type: 'text-summary' },
        { type: 'json' },
        { type: 'html' }
      ]
    };

  }

  config.set(configuration);
};

webpack.test.js

/**
 * @author: @AngularClass
 */

const helpers = require('./helpers');

/**
 * Webpack Plugins
 */
const ProvidePlugin = require('webpack/lib/ProvidePlugin');
const DefinePlugin = require('webpack/lib/DefinePlugin');

/**
 * Webpack Constants
 */
const ENV = process.env.ENV = process.env.NODE_ENV = 'test';

const autowatch = process.env.npm_lifecycle_script.indexOf('--auto-watch') !== -1;

/**
 * Webpack configuration
 *
 * See: http://webpack.github.io/docs/configuration.html#cli
 */
module.exports = function(options) {
  let config =  {

    /**
     * Source map for Karma from the help of karma-sourcemap-loader &  karma-webpack
     *
     * Do not change, leave as is or it wont work.
     * See: https://github.com/webpack/karma-webpack#source-maps
     */
    devtool: 'inline-source-map',

    /**
     * Options affecting the resolving of modules.
     *
     * See: http://webpack.github.io/docs/configuration.html#resolve
     */
    resolve: {

      /**
       * An array of extensions that should be used to resolve modules.
       *
       * See: http://webpack.github.io/docs/configuration.html#resolve-extensions
       */
      extensions: ['', '.ts', '.js'],

      /**
       * Make sure root is src
       */
      root: helpers.root('src'),

    },

    /**
     * Options affecting the normal modules.
     *
     * See: http://webpack.github.io/docs/configuration.html#module
     */
    module: {

      /**
       * An array of applied pre and post loaders.
       *
       * See: http://webpack.github.io/docs/configuration.html#module-preloaders-module-postloaders
       */
      preLoaders: [

        /**
         * Tslint loader support for *.ts files
         *
         * See: https://github.com/wbuchwalter/tslint-loader
         */
        {
          test: /\.ts$/,
          loader: 'tslint-loader',
          exclude: [helpers.root('node_modules')]
        },

        /**
         * Source map loader support for *.js files
         * Extracts SourceMaps for source files that as added as sourceMappingURL comment.
         *
         * See: https://github.com/webpack/source-map-loader
         */
        {
          test: /\.js$/,
          loader: 'source-map-loader',
          exclude: [
          // these packages have problems with their sourcemaps
          helpers.root('node_modules/rxjs'),
          helpers.root('node_modules/@angular')
        ]}

      ],

      /**
       * An array of automatically applied loaders.
       *
       * IMPORTANT: The loaders here are resolved relative to the resource which they are applied to.
       * This means they are not resolved relative to the configuration file.
       *
       * See: http://webpack.github.io/docs/configuration.html#module-loaders
       */
      loaders: [

        /**
         * Typescript loader support for .ts and Angular 2 async routes via .async.ts
         *
         * See: https://github.com/s-panferov/awesome-typescript-loader
         */
        {
          test: /\.ts$/,
          loader: 'awesome-typescript-loader',
          query: {
            compilerOptions: {

              // Remove TypeScript helpers to be injected
              // below by DefinePlugin
              removeComments: true

            }
          },
          exclude: [/\.e2e\.ts$/]
        },

        /**
         * Json loader support for *.json files.
         *
         * See: https://github.com/webpack/json-loader
         */
        { test: /\.json$/, loader: 'json-loader', exclude: [helpers.root('src/index.html')] },

        /**
         * Raw loader support for *.css files
         * Returns file content as string
         *
         * See: https://github.com/webpack/raw-loader
         */
        { test: /\.css$/, loaders: ['to-string-loader', 'css-loader'], exclude: [helpers.root('src/index.html')] },

        /**
         * Raw loader support for *.html
         * Returns file content as string
         *
         * See: https://github.com/webpack/raw-loader
         */
        { test: /\.html$/, loader: 'raw-loader', exclude: [helpers.root('src/index.html')] }

      ],

      /**
       * An array of applied pre and post loaders.
       *
       * See: http://webpack.github.io/docs/configuration.html#module-preloaders-module-postloaders
       */
      postLoaders: []
    },

    /**
     * Add additional plugins to the compiler.
     *
     * See: http://webpack.github.io/docs/configuration.html#plugins
     */
    plugins: [

      /**
       * Plugin: DefinePlugin
       * Description: Define free variables.
       * Useful for having development builds with debug logging or adding global constants.
       *
       * Environment helpers
       *
       * See: https://webpack.github.io/docs/list-of-plugins.html#defineplugin
       */
      // NOTE: when adding more properties make sure you include them in custom-typings.d.ts
      new DefinePlugin({
        'ENV': JSON.stringify(ENV),
        'HMR': false,
        'process.env': {
          'ENV': JSON.stringify(ENV),
          'NODE_ENV': JSON.stringify(ENV),
          'HMR': false,
        }
      }),


    ],

    /**
     * Static analysis linter for TypeScript advanced options configuration
     * Description: An extensible linter for the TypeScript language.
     *
     * See: https://github.com/wbuchwalter/tslint-loader
     */
    tslint: {
      emitErrors: false,
      failOnHint: false,
      resourcePath: 'src'
    },

    /**
     * Include polyfills or mocks for various node stuff
     * Description: Node configuration
     *
     * See: https://webpack.github.io/docs/configuration.html#node
     */
    node: {
      global: 'window',
      process: false,
      crypto: 'empty',
      module: false,
      clearImmediate: false,
      setImmediate: false
    }

  };

  // skip coverage in watch mode
  if (!autowatch) {
    config.module.postLoaders.push(/**
         * Instruments JS files with Istanbul for subsequent code coverage reporting.
         * Instrument only testing sources.
         *
         * See: https://github.com/deepsweet/istanbul-instrumenter-loader
         */
        {
          test: /\.(js|ts)$/, loader: 'istanbul-instrumenter-loader',
          include: helpers.root('src'),
          exclude: [
            /\.(e2e|spec)\.ts$/,
            /node_modules/
          ]
        });
  }

  return config;
}

现在，您应该能够在运行npm run watch:test时看到源文件脚本文件。

Answer 2

这看起来很像this Stack Overflow question，所以它可能确实有相同的解决方案。

默认情况下，WebPack不会将源映射传递到Karma，除非文件扩展名为.js（如果您使用的是React，则为.jsx）。在像这样的设置中，Karma + WebPack只是将.ts文件（或.tsx）直接从TypeScript转换为JavaScript，并以相同的文件名提供它们。

我找到了一个适合我的解决方案on the GitHub Issues page for karma-webpack。诀窍是将带有加宽文件过滤器的webpack.SourceMapDevToolPlugin注入到webpack配置中。对你来说，这应该是这样的：

var webpack = require('webpack');
// in your config.set:
plugins: [
  // existing plugins go here
  new webpack.SourceMapDevToolPlugin({
    filename: null, // if no value is provided the sourcemap is inlined
    test: /\.(ts|js)($|\?)/i // process .js and .ts files only
  })
]

尝试一下，看看它是否无法解决问题。

Answer 3

源代码为我映射了另一个位置（_karma_webpack_）的位置，直到偶然发现this时，调试配置才起作用。解决方案是将以下内容添加到我的调试配置中。

  "pathMapping": {
    "/_karma_webpack_": "${workspaceFolder}"
  },

这是我的调试配置：

{
        "name": "ng test",
        "type": "chrome",
        "request": "launch",
        "url": "http://localhost:9876/debug.html",
        "webRoot": "${workspaceFolder}",
        "sourceMaps": true,
        "pathMapping": {
            "/_karma_webpack_": "${workspaceFolder}"
        },
        "port": 9000
},

Karma Webpack源图无效

3 个答案: