electron/lib/common/init.js
Samuel Attard 54ef906832
[RFC] perf: use an internal module resolver to improve require performance (#14633)
* perf: use an internal module resolver instead of relative requires

* perf: memoize the results of getting exported Electron properties

* perf: make internal module changes consistent across sandboxed / bundled files
2018-09-20 13:43:26 +10:00

61 lines
2.1 KiB
JavaScript

const timers = require('timers')
const util = require('util')
process.atomBinding = require('@electron/internal/common/atom-binding-setup')(process.binding, process.type)
// 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.
const wrapWithActivateUvLoop = function (func) {
return wrap(func, function (func) {
return function () {
process.activateUvLoop()
return func.apply(this, arguments)
}
})
}
function wrap (func, wrapper) {
const wrapped = wrapper(func)
if (func[util.promisify.custom]) {
wrapped[util.promisify.custom] = wrapper(func[util.promisify.custom])
}
return wrapped
}
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)
}
if (process.platform === 'win32') {
// Always returns EOF for stdin stream.
const { Readable } = require('stream')
const stdin = new Readable()
stdin.push(null)
process.__defineGetter__('stdin', function () {
return stdin
})
// If we're running as a Windows Store app, __dirname will be set
// to C:/Program Files/WindowsApps.
//
// Nobody else get's to install there, changing the path is forbidden
// We can therefore say that we're running as appx
if (__dirname.includes('\\WindowsApps\\')) {
process.windowsStore = true
}
}