electron/lib/common/init.js

const path = require('path');
const timers = require('timers');
const Module = require('module');

process.atomBinding = function(name) {
  try {
    return process.binding("atom_" + process.type + "_" + name);
  } catch (error) {
    if (/No such module/.test(error.message)) {
      return process.binding("atom_common_" + name);
    }
  }
};

if (!process.env.ELECTRON_HIDE_INTERNAL_MODULES) {
  // Add common/api/lib to module search paths.
  Module.globalPaths.push(path.join(__dirname, 'api'));
}


// setImmediate and process.nextTick makes use of uv_check and uv_prepare to
// run the callbacks, however since we only run uv loop on requests, the
// callbacks wouldn't be called until something else activated the uv loop,
// which would delay the callbacks for arbitrary long time. So we should
// initiatively activate the uv loop once setImmediate and process.nextTick is
// called.
var wrapWithActivateUvLoop = function(func) {
  return function() {
    process.activateUvLoop();
    return func.apply(this, arguments);
  };
};

process.nextTick = wrapWithActivateUvLoop(process.nextTick);

global.setImmediate = wrapWithActivateUvLoop(timers.setImmediate);

global.clearImmediate = timers.clearImmediate;

if (process.type === 'browser') {
  // setTimeout needs to update the polling timeout of the event loop, when
  // called under Chromium's event loop the node's event loop won't get a chance
  // to update the timeout, so we have to force the node's event loop to
  // recalculate the timeout in browser process.
  global.setTimeout = wrapWithActivateUvLoop(timers.setTimeout);
  global.setInterval = wrapWithActivateUvLoop(timers.setInterval);
}