Support automated app.asar detection and require

[thiscantbeserious]

It seems like you added support for automatic search for module inside node_modules.asar via addAsarToLookupPaths as in hooking Module._resolveLookupPaths - however not in app.asar which is the default bundle for electron(-builder) given that might also include node_modules.

In my case I'm calling child_process.fork inside an Electron-App for a background-server that I want to require node_modules and dependencies inside app.asar.

Furthermore I'm unsure if your code even properly works - I had to refactor it quite a bit to make it work.

See below example code - if you want I can refine this into a PR to add a configuration option to search in an array-list of files so that your current addAsarToLookupPaths can be replaced by a more generic utility for all cases.

Do you want a PR? :)

// top of your entryPoint.js or whatever module that you want to fork
const asar = require('asar-node');
const path = require('path');
const Module = require('module');

asar.register();

const baseDir = path.join(__dirname, "../");

const _orgResolveLookupPaths = Module._resolveLookupPaths; 

(function hookModule () {
  if(Module.isHooked) return;

  function appendPaths (request, paths) {
    let _possibleAppendedPaths = [path.join(baseDir, "/app.asar/", "/node_modules/", request)];
    for (let i = 0; i < paths.length; i++) {
      const _path = paths[i];
      const isBaseDir = _path.indexOf(baseDir);
      if(isBaseDir > -1 && _path.indexOf("app.asar") < 0) {
        _possibleAppendedPaths.push(path.join(baseDir, "/app.asar/", _path.substr(isBaseDir+baseDir.length)))
      }
    }
    return paths = paths.concat(_possibleAppendedPaths);
  }
  Module._resolveLookupPaths = function (request, parent) {
    if(parent && parent.paths) {
      parent.paths = appendPaths(request, parent.paths);
    }
    return _orgResolveLookupPaths.call(this, request, parent)
  }
  Module.isHooked = true

})();

//----- your regular dependencies afterwards

const express = require('express'); //will be loaded from ./app.asar/node_modules/express successfully

[toyobayashi]

@thiscantbeserious Sorry to reply late. That sounds great! Feel free to open a PR