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• [DIR] ..
• [FILE] browser.js
• [FILE] errors.js
• [FILE] index.js
• [FILE] primordials.js
• [DIR] util
• [FILE] util.js

Просмотр файла: util.js

'use strict'

const bufferModule = require('buffer')
const { format, inspect } = require('./util/inspect')
const {
  codes: { ERR_INVALID_ARG_TYPE }
} = require('./errors')
const { kResistStopPropagation, AggregateError, SymbolDispose } = require('./primordials')
const AbortSignal = globalThis.AbortSignal || require('abort-controller').AbortSignal
const AbortController = globalThis.AbortController || require('abort-controller').AbortController
const AsyncFunction = Object.getPrototypeOf(async function () {}).constructor
const Blob = globalThis.Blob || bufferModule.Blob
/* eslint-disable indent */
const isBlob =
  typeof Blob !== 'undefined'
    ? function isBlob(b) {
        // eslint-disable-next-line indent
        return b instanceof Blob
      }
    : function isBlob(b) {
        return false
      }
/* eslint-enable indent */

const validateAbortSignal = (signal, name) => {
  if (signal !== undefined && (signal === null || typeof signal !== 'object' || !('aborted' in signal))) {
    throw new ERR_INVALID_ARG_TYPE(name, 'AbortSignal', signal)
  }
}
const validateFunction = (value, name) => {
  if (typeof value !== 'function') {
    throw new ERR_INVALID_ARG_TYPE(name, 'Function', value)
  }
}
module.exports = {
  AggregateError,
  kEmptyObject: Object.freeze({}),
  once(callback) {
    let called = false
    return function (...args) {
      if (called) {
        return
      }
      called = true
      callback.apply(this, args)
    }
  },
  createDeferredPromise: function () {
    let resolve
    let reject

    // eslint-disable-next-line promise/param-names
    const promise = new Promise((res, rej) => {
      resolve = res
      reject = rej
    })
    return {
      promise,
      resolve,
      reject
    }
  },
  promisify(fn) {
    return new Promise((resolve, reject) => {
      fn((err, ...args) => {
        if (err) {
          return reject(err)
        }
        return resolve(...args)
      })
    })
  },
  debuglog() {
    return function () {}
  },
  format,
  inspect,
  types: {
    isAsyncFunction(fn) {
      return fn instanceof AsyncFunction
    },
    isArrayBufferView(arr) {
      return ArrayBuffer.isView(arr)
    }
  },
  isBlob,
  deprecate(fn, message) {
    return fn
  },
  addAbortListener:
    require('events').addAbortListener ||
    function addAbortListener(signal, listener) {
      if (signal === undefined) {
        throw new ERR_INVALID_ARG_TYPE('signal', 'AbortSignal', signal)
      }
      validateAbortSignal(signal, 'signal')
      validateFunction(listener, 'listener')
      let removeEventListener
      if (signal.aborted) {
        queueMicrotask(() => listener())
      } else {
        signal.addEventListener('abort', listener, {
          __proto__: null,
          once: true,
          [kResistStopPropagation]: true
        })
        removeEventListener = () => {
          signal.removeEventListener('abort', listener)
        }
      }
      return {
        __proto__: null,
        [SymbolDispose]() {
          var _removeEventListener
          ;(_removeEventListener = removeEventListener) === null || _removeEventListener === undefined
            ? undefined
            : _removeEventListener()
        }
      }
    },
  AbortSignalAny:
    AbortSignal.any ||
    function AbortSignalAny(signals) {
      // Fast path if there is only one signal.
      if (signals.length === 1) {
        return signals[0]
      }
      const ac = new AbortController()
      const abort = () => ac.abort()
      signals.forEach((signal) => {
        validateAbortSignal(signal, 'signals')
        signal.addEventListener('abort', abort, {
          once: true
        })
      })
      ac.signal.addEventListener(
        'abort',
        () => {
          signals.forEach((signal) => signal.removeEventListener('abort', abort))
        },
        {
          once: true
        }
      )
      return ac.signal
    }
}
module.exports.promisify.custom = Symbol.for('nodejs.util.promisify.custom')

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