electron/lib/common/asar_init.js

(function () {
  return function(process, require, asarSource) {
    // Make asar.coffee accessible via "require".
    process.binding('natives').ATOM_SHELL_ASAR = asarSource;

    // Monkey-patch the fs module.
    require('ATOM_SHELL_ASAR').wrapFsWithAsar(require('fs'));

    // Make graceful-fs work with asar.
    var source = process.binding('natives');
    source['original-fs'] = source.fs;
    return source['fs'] = `
var nativeModule = new process.NativeModule('original-fs');
nativeModule.cache();
nativeModule.compile();
var asar = require('ATOM_SHELL_ASAR');
asar.wrapFsWithAsar(nativeModule.exports);
module.exports = nativeModule.exports`;
  };
})();