관리-도구

편집 파일: util.js

'use strict'

const bufferModule = require('buffer')
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 */

// This is a simplified version of AggregateError
class AggregateError extends Error {
  constructor(errors) {
    if (!Array.isArray(errors)) {
      throw new TypeError(`Expected input to be an Array, got ${typeof errors}`)
    }
    let message = ''
    for (let i = 0; i < errors.length; i++) {
      message += `    ${errors[i].stack}\n`
    }
    super(message)
    this.name = 'AggregateError'
    this.errors = errors
  }
}
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(format, ...args) {
    // Simplified version of https://nodejs.org/api/util.html#utilformatformat-args
    return format.replace(/%([sdifj])/g, function (...[_unused, type]) {
      const replacement = args.shift()
      if (type === 'f') {
        return replacement.toFixed(6)
      } else if (type === 'j') {
        return JSON.stringify(replacement)
      } else if (type === 's' && typeof replacement === 'object') {
        const ctor = replacement.constructor !== Object ? replacement.constructor.name : ''
        return `${ctor} {}`.trim()
      } else {
        return replacement.toString()
      }
    })
  },
  inspect(value) {
    // Vastly simplified version of https://nodejs.org/api/util.html#utilinspectobject-options
    switch (typeof value) {
      case 'string':
        if (value.includes("'")) {
          if (!value.includes('"')) {
            return `"${value}"`
          } else if (!value.includes('`') && !value.includes('${')) {
            return `\`${value}\``
          }
        }
        return `'${value}'`
      case 'number':
        if (isNaN(value)) {
          return 'NaN'
        } else if (Object.is(value, -0)) {
          return String(value)
        }
        return value
      case 'bigint':
        return `${String(value)}n`
      case 'boolean':
      case 'undefined':
        return String(value)
      case 'object':
        return '{}'
    }
  },
  types: {
    isAsyncFunction(fn) {
      return fn instanceof AsyncFunction
    },
    isArrayBufferView(arr) {
      return ArrayBuffer.isView(arr)
    }
  },
  isBlob
}
module.exports.promisify.custom = Symbol.for('nodejs.util.promisify.custom')