Improve typing of teardown methods #3003
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This helps with the @typescript-eslint/no-misused-promises ESLint rule.
The returned method always returns Promise<void>. The teardown function itself may or may not return a promise. Support both to help with the @typescript-eslint/no-misused-promises ESLint rule.
sindresorhus
reviewed
Apr 5, 2022
| publish: (data: Data) => PublishedMessage<Data>; | ||
| subscribe: () => AsyncIterableIterator<ReceivedMessage<Data>>; | ||
| teardown: <TeardownFn extends () => void> (fn: TeardownFn) => TeardownFn; | ||
| teardown: (fn: (() => Promise<void>) | (() => void)) => () => Promise<void>; |
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Suggested change
| teardown: (fn: (() => Promise<void>) | (() => void)) => () => Promise<void>; | |
| teardown: (fn: (() => Promise<void> | void) => () => Promise<void>; |
?
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Would that be fine or would void "nullify" Promise<void>? Or would it be clearer to have overloads?
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Hmm: microsoft/TypeScript#43921
I guess what you have is fine.
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I don't really know if overloads will make any difference.
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The teardown functions may or may not return a promise. Support both to help with the @typescript-eslint/no-misused-promises ESLint rule.