imports-loader/dist/index.js

imports 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(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/*
  MIT License http://www.opensource.org/licenses/mit-license.php
  Author Tobias Koppers @sokra
*/

const HEADER = "/*** IMPORTS FROM imports-loader ***/\n";
function loader(content, sourceMap) {
  const options = this.getOptions(_options.default);
  const type = options.type || "module";
  const callback = this.async();
  let importsCode = HEADER;
  let imports;
  if (typeof options.imports !== "undefined") {
    try {
      imports = (0, _utils.getImports)(type, options.imports);
    } catch (error) {
      callback(error);
      return;
    }

    // We don't need to remove 'use strict' manually, because `terser` do it
    const directive = (0, _utils.sourceHasUseStrict)(content);
    importsCode += Object.entries(imports).reduce((accumulator, item) => `${accumulator}${(0, _utils.renderImports)(this, type, item[0], item[1])}\n`, directive ? "'use strict';\n" : "");
  }
  if (typeof options.additionalCode !== "undefined") {
    importsCode += `\n${options.additionalCode}\n`;
  }
  let codeAfterModule = "";
  if (typeof options.wrapper !== "undefined") {
    let thisArg;
    let args;
    let params;
    if (typeof options.wrapper === "boolean") {
      thisArg = "";
      params = "";
      args = "";
    } else if (typeof options.wrapper === "string") {
      thisArg = options.wrapper;
      params = "";
      args = "";
    } else {
      ({
        thisArg,
        args
      } = options.wrapper);
      if (Array.isArray(args)) {
        params = args.join(", ");
        args = params;
      } else {
        params = Object.keys(args).join(", ");
        args = Object.values(args).join(", ");
      }
    }
    importsCode += `\n(function(${params}) {`;
    codeAfterModule += `\n}.call(${thisArg}${args ? `, ${args}` : ""}));\n`;
  }
  if (this.sourceMap) {
    const {
      SourceNode,
      SourceMapConsumer,
      SourceMapGenerator
    } = require("source-map-js"); // eslint-disable-line global-require

    if (sourceMap) {
      const node = SourceNode.fromStringWithSourceMap(content, new SourceMapConsumer(sourceMap));
      node.prepend(`${importsCode}\n`);
      node.add(codeAfterModule);
      const result = node.toStringWithSourceMap({
        file: this.resourcePath
      });
      callback(null, result.code, result.map.toJSON());
      return;
    }
    const generator = new SourceMapGenerator();
    generator.setSourceContent(this.resourcePath, content);
    generator.addMapping({
      generated: {
        line: importsCode.split("\n").length + 1,
        column: 0
      },
      original: {
        line: 1,
        column: 0
      },
      source: this.resourcePath
    });
    callback(null, `${importsCode}\n${content}\n${codeAfterModule}`, generator.toJSON());
    return;
  }
  callback(null, `${importsCode}\n${content}${codeAfterModule}`, sourceMap);
}