This repo is DEPRECATED in favor of promise-controller!

controlled-promise

A Promise wrapping library for advanced control of promise lifecycle. Allows to split business logic from promise manipulation:

• automatically store resolve / reject functions for future call
• return existing promise while async operation is still pending
• auto-reject after configured timeout

Installation

npm install controlled-promise --save

Usage

const ControlledPromise = require('controlled-promise');

// Create controlled promise
const controlledPromise = new ControlledPromise();

// Calls asynchronous function and returns promise. 
// The `resolve / reject` functions can be called later as `controlledPromise.resolve() / controlledPromise.reject()`.
const promise = controlledPromise.call(() => someAsyncFn());

// Resolve promise later via cp.resolve()
controlledPromise.resolve();

// OR reject promise later via cp.reject()
controlledPromise.reject(error);

API

ControlledPromise

Controlled Promise.

Kind: global class

• ControlledPromise
  • new ControlledPromise()
  • .promise ⇒ Promise
  • .value ⇒ *
  • .isPending ⇒ Boolean
  • .isFulfilled ⇒ Boolean
  • .isRejected ⇒ Boolean
  • .isSettled ⇒ Boolean
  • .isCalled ⇒ Boolean
  • .call(fn) ⇒ Promise
  • .resolve([value])
  • .reject([value])
  • .reset()
  • .timeout(ms, [reason])

new ControlledPromise()

Creates controlled promise. In contrast to original Promise, it does not immediately call any function. Instead it has .call() method for that and resolve / reject methods for resolving promise.

controlledPromise.promise ⇒ Promise

Returns promise itself.

Kind: instance property of ControlledPromise

controlledPromise.value ⇒ *

Returns value with that promise was fulfilled (resolved or rejected).

Kind: instance property of ControlledPromise

controlledPromise.isPending ⇒ Boolean

Returns true if promise is pending.

Kind: instance property of ControlledPromise

controlledPromise.isFulfilled ⇒ Boolean

Returns true if promise is fulfilled.

Kind: instance property of ControlledPromise

controlledPromise.isRejected ⇒ Boolean

Returns true if promise rejected.

Kind: instance property of ControlledPromise

controlledPromise.isSettled ⇒ Boolean

Returns true if promise fulfilled or rejected.

Kind: instance property of ControlledPromise

controlledPromise.isCalled ⇒ Boolean

Returns true if promise already called via .call() method.

Kind: instance property of ControlledPromise

controlledPromise.call(fn) ⇒ Promise

This method executes fn and returns promise. While promise is pending all subsequent calls of .call(fn) will return the same promise. To fulfill that promise you can use .resolve() / .reject() methods.

Kind: instance method of ControlledPromise

controlledPromise.resolve([value])

Resolves pending promise with specified value.

Kind: instance method of ControlledPromise

controlledPromise.reject([value])

Rejects pending promise with specified value.

Kind: instance method of ControlledPromise

controlledPromise.reset()

Resets to initial state.

Kind: instance method of ControlledPromise

controlledPromise.timeout(ms, [reason])

Sets timeout to reject promise automatically.

Kind: instance method of ControlledPromise

Related

• event-to-promise
• promise-events

License

MIT @ Vitaliy Potapov