Comparison table

Comparison table

	CPromise	BlueBird.js	p-cancelable
.cancel() is synchronous	❌* (.cancel emits a cancel signal synchronously, but the cancellation is asynchronous)	✓	✓
No setup code required to make cancellation work	✓	✓	✓
Cancellation type	asynchronous, rejection with CanceledError follows the special algorithm	synchronous (ignoring attached callbacks)	synchronous (ignoring attached callbacks) / asynchronous (rejecting)
onCancel handler to clean up internal tasks	✓	✓	✓
Atomic sub-chains (protected from cancellation by upper chains)	✓	❌	❌
Cancellation flows	✓	❌	❌
Custom cancellation reasons	✓	❌	✓
Cancellation composes with other own features, like .all, .race, .allSettled	✓	✓	❌
Chaining/nested promise cancellation support	✓	✓	❌
Generators support for “flat” coroutines (as a functional replacement for ECMA async functions)	✓	✓	❌
Coroutines cancellation	✓	❌	❌
Concurrency limitation	✓	✓	❌
Signals/data flows	✓	❌	❌
Chain progress capturing	✓	❌	❌
Pause/resume support	✓	❌	❌
timeouts	✓	✓	❌
AbortController support (outer/inner)	✓/✓	❌	❌
.catch errors filter	✓	✓	❌
.delay helper	✓	✓	❌
ECMA decorators for methods (legacy/current)	✓/✓	❌	❌
Inherited from the native Promise	✓	❌	❌