fix: correct isPromise implementation
#13314
Conversation
packages/jest-util/src/isPromise.ts
Outdated
| const isPromise = (candidate: unknown): candidate is PromiseLike<unknown> => | ||
| candidate != null && | ||
| (typeof candidate === 'object' || typeof candidate === 'function') && | ||
| typeof (candidate as any).then === 'function'; |
There was a problem hiding this comment.
Perhaps? Just to avoid any? Or the point is to be explicit that this is still any?
| typeof (candidate as any).then === 'function'; | |
| typeof (candidate as PromiseLike<unknown>).then === 'function'; |
There was a problem hiding this comment.
the cast would lie - I just want to be able to access a prop. I guess as Record<string, unknown> | (...args: unknown[]) => unknown or something is more precise looking at the typeof checks. But not really, as typeof new Map === 'object'. Just saying any seems cleanest
| @@ -23,3 +23,12 @@ test('a resolved Promise', () => { | |||
| test('a rejected Promise', () => { | |||
| expect(isPromise(Promise.reject().catch(() => {}))).toBe(true); | |||
| }); | |||
|
|
|||
| test('a thenable', () => { | |||
There was a problem hiding this comment.
this test fails with the old implementation, fwiw
|
This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs. |
Summary
The linked SO post says not to use it 🙈
Test plan
Green CI