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Copy pathinit.ts
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66 lines (57 loc) · 2.24 KB
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import * as util from 'util';
const timers = require('timers');
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 = timers.setImmediate = wrapWithActivateUvLoop(timers.setImmediate);
global.clearImmediate = timers.clearImmediate;
// 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.
timers.setTimeout = wrapWithActivateUvLoop(timers.setTimeout);
timers.setInterval = wrapWithActivateUvLoop(timers.setInterval);
// Only override the global setTimeout/setInterval impls in the browser process
if (process.type === 'browser') {
global.setTimeout = timers.setTimeout;
global.setInterval = 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;
}
});
}