karma-webpack.js 28.9 KB
'use strict';

var _ = require('lodash');
var path = require('path');
var async = require('async');
var webpackDevMiddleware = require('webpack-dev-middleware');
var webpack = require('webpack');
var SingleEntryDependency = require('webpack/lib/dependencies/SingleEntryDependency');

var blocked = [];
var isBlocked = false;

function Plugin(
/* config.webpack */webpackOptions,
/* config.webpackServer */webpackServerOptions,
/* config.webpackMiddleware */webpackMiddlewareOptions,
/* config.basePath */basePath,
/* config.files */files,
/* config.frameworks */frameworks, customFileHandlers, emitter) {
  webpackOptions = _.clone(webpackOptions) || {};
  webpackMiddlewareOptions = _.clone(webpackMiddlewareOptions || webpackServerOptions) || {};

  var applyOptions = Array.isArray(webpackOptions) ? webpackOptions : [webpackOptions];
  var includeIndex = applyOptions.length > 1;

  applyOptions.forEach(function (webpackOptions, index) {
    // The webpack tier owns the watch behavior so we want to force it in the config
    webpackOptions.watch = true;

    // Webpack 2.1.0-beta.7+ will throw in error if both entry and plugins are not specified in options
    // https://github.com/webpack/webpack/commit/b3bc5427969e15fd3663d9a1c57dbd1eb2c94805
    if (!webpackOptions.entry) {
      webpackOptions.entry = function () {
        return {};
      };
    };

    if (!webpackOptions.output) {
      webpackOptions.output = {};
    };

    // When using an array, even of length 1, we want to include the index value for the build.
    // This is due to the way that the dev server exposes commonPath for build output.
    var indexPath = includeIndex ? index + '/' : '';
    var publicPath = indexPath !== '' ? indexPath + '/' : '';

    // Must have the common _karma_webpack_ prefix on path here to avoid
    // https://github.com/webpack/webpack/issues/645
    webpackOptions.output.path = '/_karma_webpack_/' + indexPath;
    webpackOptions.output.publicPath = '/_karma_webpack_/' + publicPath;
    webpackOptions.output.filename = '[name]';
    if (includeIndex) {
      webpackOptions.output.jsonpFunction = 'webpackJsonp' + index;
    }
    webpackOptions.output.chunkFilename = '[id].bundle.js';
  });

  this.emitter = emitter;
  this.wrapMocha = frameworks.indexOf('mocha') >= 0 && includeIndex;
  this.optionsCount = applyOptions.length;
  this.files = [];
  this.basePath = basePath;
  this.waiting = [];

  var compiler = webpack(webpackOptions);
  var applyPlugins = compiler.compilers || [compiler];

  applyPlugins.forEach(function (compiler) {
    compiler.plugin('this-compilation', function (compilation, params) {
      compilation.dependencyFactories.set(SingleEntryDependency, params.normalModuleFactory);
    });
    compiler.plugin('make', this.make.bind(this));
  }, this);

  ['invalid', 'watch-run', 'run'].forEach(function (name) {
    compiler.plugin(name, function (_, callback) {
      isBlocked = true;

      if (typeof callback === 'function') {
        callback();
      }
    });
  });

  compiler.plugin('done', function (stats) {
    var applyStats = Array.isArray(stats.stats) ? stats.stats : [stats];
    var assets = [];
    var noAssets = false;

    applyStats.forEach(function (stats) {
      stats = stats.toJson();

      assets.push.apply(assets, stats.assets);
      if (stats.assets.length === 0) {
        noAssets = true;
      }
    });

    if (!this.waiting || this.waiting.length === 0) {
      this.notifyKarmaAboutChanges();
    }

    if (this.waiting && !noAssets) {
      var w = this.waiting;

      this.waiting = null;
      w.forEach(function (cb) {
        cb();
      });
    }

    isBlocked = false;
    for (var i = 0; i < blocked.length; i++) {
      blocked[i]();
    }
    blocked = [];
  }.bind(this));
  compiler.plugin('invalid', function () {
    if (!this.waiting) {
      this.waiting = [];
    }
  }.bind(this));

  webpackMiddlewareOptions.publicPath = '/_karma_webpack_/';
  var middleware = this.middleware = new webpackDevMiddleware(compiler, webpackMiddlewareOptions);

  customFileHandlers.push({
    urlRegex: /^\/_karma_webpack_\/.*/,
    handler: function handler(req, res) {
      middleware(req, res, function () {
        res.statusCode = 404;
        res.end('Not found');
      });
    }
  });

  emitter.on('exit', function (done) {
    middleware.close();
    done();
  });
}

Plugin.prototype.notifyKarmaAboutChanges = function () {
  // Force a rebuild
  this.emitter.refreshFiles();
};

Plugin.prototype.addFile = function (entry) {
  if (this.files.indexOf(entry) >= 0) {
    return;
  }
  this.files.push(entry);

  return true;
};

Plugin.prototype.make = function (compilation, callback) {
  async.forEach(this.files.slice(), function (file, callback) {
    var entry = file;

    if (this.wrapMocha) {
      entry = require.resolve('./mocha-env-loader') + '!' + entry;
    }

    var dep = new SingleEntryDependency(entry);

    compilation.addEntry('', dep, path.relative(this.basePath, file).replace(/\\/g, '/'), function () {
      // If the module fails because of an File not found error, remove the test file
      if (dep.module && dep.module.error && dep.module.error.error && dep.module.error.error.code === 'ENOENT') {
        this.files = this.files.filter(function (f) {
          return file !== f;
        });
        this.middleware.invalidate();
      }
      callback();
    }.bind(this));
  }.bind(this), callback);
};

Plugin.prototype.readFile = function (file, callback) {
  var middleware = this.middleware;
  var optionsCount = this.optionsCount;

  function doRead() {
    if (optionsCount > 1) {
      async.times(optionsCount, function (idx, callback) {
        middleware.fileSystem.readFile('/_karma_webpack_/' + idx + '/' + file.replace(/\\/g, '/'), callback);
      }, function (err, contents) {
        if (err) {
          return callback(err);
        };
        contents = contents.reduce(function (arr, x) {
          if (!arr) {
            return [x];
          };
          arr.push(new Buffer('\n'), x);

          return arr;
        }, null);
        callback(null, Buffer.concat(contents));
      });
    } else {
      middleware.fileSystem.readFile('/_karma_webpack_/' + file.replace(/\\/g, '/'), callback);
    }
  }
  if (!this.waiting) {
    try {
      doRead();
    } catch (e) {
      // If this is an error from `readFileSync` method, wait for the next tick. Credit #69 @mewdriller
      if (e.message.substring(0, 20) === "Path doesn't exist '") {
        // eslint-disable-line quotes
        this.waiting = [process.nextTick.bind(process, this.readFile.bind(this, file, callback))];
      } else {
        throw e;
      }
    }
  } else {
    // Retry to read once a build is finished
    // do it on process.nextTick to catch changes while building
    this.waiting.push(process.nextTick.bind(process, this.readFile.bind(this, file, callback)));
  }
};

function createPreprocesor( /* config.basePath */basePath, webpackPlugin) {
  return function (content, file, done) {
    if (webpackPlugin.addFile(file.path)) {
      // recompile as we have an asset that we have not seen before
      webpackPlugin.middleware.invalidate();
    }

    // read blocks until bundle is done
    webpackPlugin.readFile(path.relative(basePath, file.path), function (err, content) {
      if (err) {
        throw err;
      }

      done(err, content && content.toString());
    });
  };
}

function createWebpackBlocker() {
  return function (request, response, next) {
    if (isBlocked) {
      blocked.push(next);
    } else {
      next();
    }
  };
}

module.exports = {
  webpackPlugin: ['type', Plugin],
  'preprocessor:webpack': ['factory', createPreprocesor],
  'middleware:webpackBlocker': ['factory', createWebpackBlocker]
};
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_ = require('lodash')\nvar path = require('path')\nvar async = require('async')\nvar webpackDevMiddleware = require('webpack-dev-middleware')\nvar webpack = require('webpack')\nvar SingleEntryDependency = require('webpack/lib/dependencies/SingleEntryDependency')\n\nvar blocked = []\nvar isBlocked = false\n\nfunction Plugin(\n\t/* config.webpack */ webpackOptions,\n\t/* config.webpackServer */ webpackServerOptions,\n\t/* config.webpackMiddleware */ webpackMiddlewareOptions,\n\t/* config.basePath */ basePath,\n\t/* config.files */ files,\n\t/* config.frameworks */ frameworks,\n\tcustomFileHandlers,\n\temitter) {\n  webpackOptions = _.clone(webpackOptions) || {}\n  webpackMiddlewareOptions = _.clone(webpackMiddlewareOptions || webpackServerOptions) || {}\n\n  var applyOptions = Array.isArray(webpackOptions) ? webpackOptions : [webpackOptions]\n  var includeIndex = applyOptions.length > 1\n\n  applyOptions.forEach(function(webpackOptions, index) {\n    // The webpack tier owns the watch behavior so we want to force it in the config\n    webpackOptions.watch = true\n\n    // Webpack 2.1.0-beta.7+ will throw in error if both entry and plugins are not specified in options\n    // https://github.com/webpack/webpack/commit/b3bc5427969e15fd3663d9a1c57dbd1eb2c94805\n    if (!webpackOptions.entry) {\n      webpackOptions.entry = function() {\n        return {}\n      }\n    };\n\n    if (!webpackOptions.output) {\n      webpackOptions.output = {}\n    };\n\n    // When using an array, even of length 1, we want to include the index value for the build.\n    // This is due to the way that the dev server exposes commonPath for build output.\n    var indexPath = includeIndex ? index + '/' : ''\n    var publicPath = indexPath !== '' ? indexPath + '/' : ''\n\n    // Must have the common _karma_webpack_ prefix on path here to avoid\n    // https://github.com/webpack/webpack/issues/645\n    webpackOptions.output.path = '/_karma_webpack_/' + indexPath\n    webpackOptions.output.publicPath = '/_karma_webpack_/' + publicPath\n    webpackOptions.output.filename = '[name]'\n    if (includeIndex) {\n      webpackOptions.output.jsonpFunction = 'webpackJsonp' + index\n    }\n    webpackOptions.output.chunkFilename = '[id].bundle.js'\n  })\n\n  this.emitter = emitter\n  this.wrapMocha = frameworks.indexOf('mocha') >= 0 && includeIndex\n  this.optionsCount = applyOptions.length\n  this.files = []\n  this.basePath = basePath\n  this.waiting = []\n\n  var compiler = webpack(webpackOptions)\n  var applyPlugins = compiler.compilers || [compiler]\n\n  applyPlugins.forEach(function(compiler) {\n    compiler.plugin('this-compilation', function(compilation, params) {\n      compilation.dependencyFactories.set(SingleEntryDependency, params.normalModuleFactory)\n    })\n    compiler.plugin('make', this.make.bind(this))\n  }, this);\n\n  ['invalid', 'watch-run', 'run'].forEach(function(name) {\n    compiler.plugin(name, function(_, callback) {\n      isBlocked = true\n\n      if (typeof callback === 'function') {\n        callback()\n      }\n    })\n  })\n\n  compiler.plugin('done', function(stats) {\n    var applyStats = Array.isArray(stats.stats) ? stats.stats : [stats]\n    var assets = []\n    var noAssets = false\n\n    applyStats.forEach(function(stats) {\n      stats = stats.toJson()\n\n      assets.push.apply(assets, stats.assets)\n      if (stats.assets.length === 0) {\n        noAssets = true\n      }\n    })\n\n    if (!this.waiting || this.waiting.length === 0) {\n      this.notifyKarmaAboutChanges()\n    }\n\n    if (this.waiting && !noAssets) {\n      var w = this.waiting\n\n      this.waiting = null\n      w.forEach(function(cb) {\n        cb()\n      })\n    }\n\n    isBlocked = false\n    for (var i = 0; i < blocked.length; i++) {\n      blocked[i]()\n    }\n    blocked = []\n  }.bind(this))\n  compiler.plugin('invalid', function() {\n    if (!this.waiting) {\n      this.waiting = []\n    }\n  }.bind(this))\n\n  webpackMiddlewareOptions.publicPath = '/_karma_webpack_/'\n  var middleware = this.middleware = new webpackDevMiddleware(compiler, webpackMiddlewareOptions)\n\n  customFileHandlers.push({\n    urlRegex: /^\\/_karma_webpack_\\/.*/,\n    handler: function(req, res) {\n      middleware(req, res, function() {\n        res.statusCode = 404\n        res.end('Not found')\n      })\n    }\n  })\n\n  emitter.on('exit', function(done) {\n    middleware.close()\n    done()\n  })\n}\n\nPlugin.prototype.notifyKarmaAboutChanges = function() {\n  // Force a rebuild\n  this.emitter.refreshFiles()\n}\n\nPlugin.prototype.addFile = function(entry) {\n  if (this.files.indexOf(entry) >= 0) {\n    return\n  }\n  this.files.push(entry)\n\n  return true\n}\n\nPlugin.prototype.make = function(compilation, callback) {\n  async.forEach(this.files.slice(), function(file, callback) {\n    var entry = file\n\n    if (this.wrapMocha) {\n      entry = require.resolve('./mocha-env-loader') + '!' + entry\n    }\n\n    var dep = new SingleEntryDependency(entry)\n\n    compilation.addEntry('', dep, path.relative(this.basePath, file).replace(/\\\\/g, '/'), function() {\n      // If the module fails because of an File not found error, remove the test file\n      if (dep.module && dep.module.error &&\n        dep.module.error.error &&\n        dep.module.error.error.code === 'ENOENT') {\n        this.files = this.files.filter(function(f) {\n          return file !== f\n        })\n        this.middleware.invalidate()\n      }\n      callback()\n    }.bind(this))\n  }.bind(this), callback)\n}\n\nPlugin.prototype.readFile = function(file, callback) {\n  var middleware = this.middleware\n  var optionsCount = this.optionsCount\n\n  function doRead() {\n    if (optionsCount > 1) {\n      async.times(optionsCount, function(idx, callback) {\n        middleware.fileSystem.readFile('/_karma_webpack_/' + idx + '/' + file.replace(/\\\\/g, '/'), callback)\n      }, function(err, contents) {\n        if (err) {\n          return callback(err)\n        };\n        contents = contents.reduce(function(arr, x) {\n          if (!arr) {\n            return [x]\n          };\n          arr.push(new Buffer('\\n'), x)\n\n          return arr\n        }, null)\n        callback(null, Buffer.concat(contents))\n      })\n    } else {\n      middleware.fileSystem.readFile('/_karma_webpack_/' + file.replace(/\\\\/g, '/'), callback)\n    }\n  }\n  if (!this.waiting) {\n    try {\n      doRead()\n    } catch (e) {\n      // If this is an error from `readFileSync` method, wait for the next tick. Credit #69 @mewdriller\n      if (e.message.substring(0, 20) === \"Path doesn't exist '\") { // eslint-disable-line quotes\n        this.waiting = [process.nextTick.bind(process, this.readFile.bind(this, file, callback))]\n      } else {\n        throw e\n      }\n    }\n  } else {\n    // Retry to read once a build is finished\n    // do it on process.nextTick to catch changes while building\n    this.waiting.push(process.nextTick.bind(process, this.readFile.bind(this, file, callback)))\n  }\n}\n\nfunction createPreprocesor(/* config.basePath */ basePath, webpackPlugin) {\n  return function(content, file, done) {\n    if (webpackPlugin.addFile(file.path)) {\n      // recompile as we have an asset that we have not seen before\n      webpackPlugin.middleware.invalidate()\n    }\n\n    // read blocks until bundle is done\n    webpackPlugin.readFile(path.relative(basePath, file.path), function(err, content) {\n      if (err) {\n        throw err\n      }\n\n      done(err, content && content.toString())\n    })\n  }\n}\n\nfunction createWebpackBlocker() {\n  return function(request, response, next) {\n    if (isBlocked) {\n      blocked.push(next)\n    } else {\n      next()\n    }\n  }\n}\n\nmodule.exports = {\n  webpackPlugin: ['type', Plugin],\n  'preprocessor:webpack': ['factory', createPreprocesor],\n  'middleware:webpackBlocker': ['factory', createWebpackBlocker]\n}\n"]}