electron/lib/common/init.ts
Robo 5afb7dc715 refactor: load electron builtin modules with process._linkedBinding (#17247)
* refactor: load electron builtin modules with process._linkedBinding

NODE_BUILTING_MODULE_CONTEXT_AWARE and process.binding are
removed in https://github.com/nodejs/node/pull/25829. This changes
uses the alternative available without any functionality change.

* chore: roll node
2019-03-08 10:29:52 -08:00

65 lines
2.2 KiB
TypeScript

import * as timers from 'timers'
import * as util from 'util'
import { atomBindingSetup } from '@electron/internal/common/atom-binding-setup'
process.atomBinding = atomBindingSetup(process._linkedBinding, process.type)
type AnyFn = (...args: any[]) => any
// 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 <T extends AnyFn> (func: T): T {
return wrap(func, function (func) {
return function (this: any, ...args: any[]) {
process.activateUvLoop()
return func.apply(this, args)
}
}) as T
}
/**
* Casts to any below for func are due to Typescript not supporting symbols
* in index signatures
*
* Refs: https://github.com/Microsoft/TypeScript/issues/1863
*/
function wrap <T extends AnyFn> (func: T, wrapper: (fn: AnyFn) => T) {
const wrapped = wrapper(func)
if ((func as any)[util.promisify.custom]) {
(wrapped as any)[util.promisify.custom] = wrapper((func as any)[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)
Object.defineProperty(process, 'stdin', {
configurable: false,
enumerable: true,
get () {
return stdin
}
})
}