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Name	Size	Permission	Date
Async.js	368 B	-rw-r--r--	2023-08-21 05:40
Sync.js	491 B	-rw-r--r--	2023-08-21 05:40
Thenable.js	1.05 KB	-rw-r--r--	2023-08-21 05:40
constants.js	158 B	-rw-r--r--	2023-08-21 05:40
unwrapSync.js	1.18 KB	-rw-r--r--	2023-08-21 05:40

Rename

'use strict'

const ExtendableError = require('es6-error')

const constants = require('./constants')

class UnwrapError extends ExtendableError {
  constructor (thenable) {
    super('Could not unwrap asynchronous thenable')
    this.thenable = thenable
  }
}

// Logic is derived from the Promise Resolution Procedure, as described in the
// Promises/A+ specification: https://promisesaplus.com/#point-45
//
// Note that there is no cycle detection.
function unwrapSync (x) {
  if (!x || typeof x !== 'object' && typeof x !== 'function') {
    return x
  }

const then = x.then
  if (typeof then !== 'function') return x

let state = constants.PENDING
  let value
  const unwrapValue = y => {
    if (state === constants.PENDING) {
      state = constants.RESOLVED
      value = y
    }
  }
  const unwrapReason = r => {
    if (state === constants.PENDING) {
      state = constants.REJECTED
      value = r
    }
  }
  then.call(x, unwrapValue, unwrapReason)

if (state === constants.PENDING) {
    state = constants.ASYNC
    throw new UnwrapError(x)
  }

if (state === constants.RESOLVED) {
    return unwrapSync(value)
  }

// state === REJECTED
  throw value
}
module.exports = unwrapSync