electron/lib/common/init.ts

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import * as timers from 'timers'
import * as util from 'util'
import { electronBindingSetup } from '@electron/internal/common/atom-binding-setup'
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process.electronBinding = electronBindingSetup(process._linkedBinding, process.type)
type AnyFn = (...args: any[]) => any
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// 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])
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}
return wrapped
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}
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process.nextTick = wrapWithActivateUvLoop(process.nextTick)
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global.setImmediate = wrapWithActivateUvLoop(timers.setImmediate)
global.clearImmediate = timers.clearImmediate
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if (process.type === 'browser') {
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// 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.
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global.setTimeout = wrapWithActivateUvLoop(timers.setTimeout)
global.setInterval = wrapWithActivateUvLoop(timers.setInterval)
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}
if (process.platform === 'win32') {
// Always returns EOF for stdin stream.
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const { Readable } = require('stream')
const stdin = new Readable()
stdin.push(null)
Object.defineProperty(process, 'stdin', {
configurable: false,
enumerable: true,
get () {
return stdin
}
})
}