electron-compile/lib/require-hook.js

Electron supporting package to compile JS and CSS in Electron applications

'use strict';

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

var _mimeTypes = require('@paulcbetts/mime-types');

var _mimeTypes2 = _interopRequireDefault(_mimeTypes);

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

let HMR = false;

const d = require('debug')('electron-compile:require-hook');
let electron = null;

if (process.type === 'renderer') {
  window.__hot = [];
  electron = require('electron');
  HMR = electron.remote.getGlobal('__electron_compile_hmr_enabled__');

  if (HMR) {
    electron.ipcRenderer.on('__electron-compile__HMR', () => {
      d("Got HMR signal!");

      // Reset the module cache
      let cache = require('module')._cache;
      let toEject = Object.keys(cache).filter(x => x && !x.match(/[\\\/](node_modules|.*\.asar)[\\\/]/i));
      toEject.forEach(x => {
        d(`Removing node module entry for ${x}`);
        delete cache[x];
      });

      window.__hot.forEach(fn => fn());
    });
  }
}

/**
 * Initializes the node.js hook that allows us to intercept files loaded by
 * node.js and rewrite them. This method along with {@link initializeProtocolHook}
 * are the top-level methods that electron-compile actually uses to intercept
 * code that Electron loads.
 *
 * @param  {CompilerHost} compilerHost  The compiler host to use for compilation.
 */
function registerRequireExtension(compilerHost, isProduction) {
  if (HMR) {
    try {
      require('module').prototype.hot = {
        accept: cb => window.__hot.push(cb)
      };

      require.main.require('react-hot-loader/patch');
    } catch (e) {
      console.error(`Couldn't require react-hot-loader/patch, you need to add react-hot-loader@3 as a dependency! ${e.message}`);
    }
  }

  let mimeTypeList = isProduction ? Object.keys(compilerHost.mimeTypesToRegister) : Object.keys(compilerHost.compilersByMimeType);

  mimeTypeList.forEach(mimeType => {
    let ext = _mimeTypes2.default.extension(mimeType);

    require.extensions[`.${ext}`] = (module, filename) => {
      var _compilerHost$compile = compilerHost.compileSync(filename);

      let code = _compilerHost$compile.code;


      if (code === null) {
        console.error(`null code returned for "${filename}".  Please raise an issue on 'electron-compile' with the contents of this file.`);
      }

      module._compile(code, filename);
    };
  });
}
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