extract-plugin/dist/loader.js

Extract any files from webpack build.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.pitch = pitch;
exports.default = _default;

var _fs = _interopRequireDefault(require("fs"));

var _path = _interopRequireDefault(require("path"));

var _module = _interopRequireDefault(require("module"));

var _loaderUtils = _interopRequireDefault(require("loader-utils"));

var _NodeTemplatePlugin = _interopRequireDefault(require("webpack/lib/node/NodeTemplatePlugin"));

var _NodeTargetPlugin = _interopRequireDefault(require("webpack/lib/node/NodeTargetPlugin"));

var _LibraryTemplatePlugin = _interopRequireDefault(require("webpack/lib/LibraryTemplatePlugin"));

var _SingleEntryPlugin = _interopRequireDefault(require("webpack/lib/SingleEntryPlugin"));

var _LimitChunkCountPlugin = _interopRequireDefault(require("webpack/lib/optimize/LimitChunkCountPlugin"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const NS = _path.default.dirname(_fs.default.realpathSync(__filename));

const pluginName = 'extract-plugin';

const exec = (loaderContext, code, filename) => {
  const module = new _module.default(filename, loaderContext);
  module.paths = _module.default._nodeModulePaths(loaderContext.context); // eslint-disable-line no-underscore-dangle

  module.filename = filename;

  module._compile(code, filename); // eslint-disable-line no-underscore-dangle


  return module.exports;
};

const findModuleById = (modules, id) => {
  for (const module of modules) {
    if (module.id === id) {
      return module;
    }
  }

  return null;
};

function pitch(request) {
  const query = _loaderUtils.default.getOptions(this) || {};
  const loaders = this.loaders.slice(this.loaderIndex + 1);
  this.addDependency(this.resourcePath);
  const childFilename = '*'; // eslint-disable-line no-path-concat

  const publicPath = typeof query.publicPath === 'string' ? query.publicPath : this._compilation.outputOptions.publicPath;
  const outputOptions = {
    filename: childFilename,
    publicPath
  };

  const childCompiler = this._compilation.createChildCompiler(`${pluginName} ${request}`, outputOptions);

  new _NodeTemplatePlugin.default(outputOptions).apply(childCompiler);
  new _LibraryTemplatePlugin.default(null, 'commonjs2').apply(childCompiler);
  new _NodeTargetPlugin.default().apply(childCompiler);
  new _SingleEntryPlugin.default(this.context, `!!${request}`, pluginName).apply(childCompiler);
  new _LimitChunkCountPlugin.default({
    maxChunks: 1
  }).apply(childCompiler); // We set loaderContext[NS] = false to indicate we already in
  // a child compiler so we don't spawn another child compilers from there.

  childCompiler.hooks.thisCompilation.tap(`${pluginName} loader`, compilation => {
    compilation.hooks.normalModuleLoader.tap(`${pluginName} loader`, (loaderContext, module) => {
      // eslint-disable-next-line no-param-reassign
      loaderContext[NS] = false;

      if (module.request === request) {
        // eslint-disable-next-line no-param-reassign
        module.loaders = loaders.map(loader => {
          return {
            loader: loader.path,
            options: loader.options,
            ident: loader.ident
          };
        });
      }
    });
  });
  let source;
  childCompiler.hooks.afterCompile.tap(pluginName, compilation => {
    source = compilation.assets[childFilename] && compilation.assets[childFilename].source(); // Remove all chunk assets

    compilation.chunks.forEach(chunk => {
      chunk.files.forEach(file => {
        delete compilation.assets[file]; // eslint-disable-line no-param-reassign
      });
    });
  });
  const callback = this.async();
  childCompiler.runAsChild((err, entries, compilation) => {
    if (err) return callback(err);

    if (compilation.errors.length > 0) {
      return callback(compilation.errors[0]);
    }

    compilation.fileDependencies.forEach(dep => {
      this.addDependency(dep);
    }, this);
    compilation.contextDependencies.forEach(dep => {
      this.addContextDependency(dep);
    }, this);

    if (!source) {
      return callback(new Error("Didn't get a result from child compiler"));
    }

    let text;
    let locals;

    try {
      text = exec(this, source, request);
      locals = text && text.locals;

      if (!Array.isArray(text)) {
        text = [{
          identifier: request,
          content: text,
          media: '',
          sourceMap: undefined
        }];
      } else {
        text = text.map(line => {
          const module = findModuleById(compilation.modules, line[0]);
          return {
            identifier: module.identifier(),
            content: line[1],
            media: line[2],
            sourceMap: line[3]
          };
        });
      }

      this[NS](text);
    } catch (e) {
      return callback(e);
    }

    let resultSource = `// extracted by ${pluginName}`;

    if (locals && typeof resultSource !== 'undefined') {
      resultSource += `\nmodule.exports = ${JSON.stringify(locals)};`;
    }

    return callback(null, resultSource);
  });
}

function _default() {}