expose-loader/dist/index.js

expose loader module for webpack

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = loader;
var _options = _interopRequireDefault(require("./options.json"));
var _utils = require("./utils");
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/*
  MIT License http://www.opensource.org/licenses/mit-license.php
  Author Tobias Koppers @sokra
*/

function loader() {
  const options = this.getOptions(_options.default);
  const callback = this.async();
  let exposes;
  try {
    exposes = (0, _utils.getExposes)(options.exposes);
  } catch (error) {
    callback(error);
    return;
  }

  /*
   * Workaround until module.libIdent() in webpack/webpack handles this correctly.
   *
   * Fixes:
   * - https://github.com/webpack-contrib/expose-loader/issues/55
   * - https://github.com/webpack-contrib/expose-loader/issues/49
   */
  this._module.userRequest = (0, _utils.getNewUserRequest)(this._module.userRequest);

  /*
   * Adding side effects
   *
   * Fixes:
   * - https://github.com/webpack-contrib/expose-loader/issues/120
   */
  if (this._module.factoryMeta) {
    this._module.factoryMeta.sideEffectFree = false;
  }

  // Change the request from an /absolute/path.js to a relative ./path.js.
  // This prevents `[chunkhash]` values from changing when running webpack builds in different directories.
  const newRequest = (0, _utils.contextify)(this, this.context, this.remainingRequest);
  const stringifiedNewRequest = (0, _utils.stringifyRequest)(this, `-!${newRequest}`);
  let code = `var ___EXPOSE_LOADER_IMPORT___ = require(${stringifiedNewRequest});\n`;
  const getGlobalThis = options.globalObject || `require(${(0, _utils.stringifyRequest)(this, require.resolve("./runtime/getGlobalThis.js"))})`;
  code += `var ___EXPOSE_LOADER_GET_GLOBAL_THIS___ = ${getGlobalThis};\n`;
  code += `var ___EXPOSE_LOADER_GLOBAL_THIS___ = ___EXPOSE_LOADER_GET_GLOBAL_THIS___;\n`;
  for (const expose of exposes) {
    const {
      globalName,
      moduleLocalName,
      override
    } = expose;
    const globalNameInterpolated = globalName.map(item => (0, _utils.interpolateName)(this, item, {}));
    if (typeof moduleLocalName !== "undefined") {
      code += `var ___EXPOSE_LOADER_IMPORT_MODULE_LOCAL_NAME___ = ___EXPOSE_LOADER_IMPORT___.${moduleLocalName}\n`;
    }
    let propertyString = "___EXPOSE_LOADER_GLOBAL_THIS___";
    for (let i = 0; i < globalName.length; i++) {
      if (i > 0) {
        code += `if (typeof ${propertyString} === 'undefined') ${propertyString} = {};\n`;
      }
      propertyString += `[${JSON.stringify(globalNameInterpolated[i])}]`;
    }
    if (!override) {
      code += `if (typeof ${propertyString} === 'undefined') `;
    }
    code += typeof moduleLocalName !== "undefined" ? `${propertyString} = ___EXPOSE_LOADER_IMPORT_MODULE_LOCAL_NAME___;\n` : `${propertyString} = ___EXPOSE_LOADER_IMPORT___;\n`;
    if (!override) {
      if (this.mode === "development") {
        code += `else throw new Error('[exposes-loader] The "${globalName.join(".")}" value exists in the global scope, it may not be safe to overwrite it, use the "override" option')\n`;
      }
    }
  }
  code += `module.exports = ___EXPOSE_LOADER_IMPORT___;\n`;
  callback(null, code);
}