27 lines
1.0 KiB
TypeScript
27 lines
1.0 KiB
TypeScript
import { Effect } from 'redux-saga/effects';
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type ExtPromise<T> = T extends Promise<infer U> ? U : T;
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type ExtSaga<T> = T extends IterableIterator<infer U>
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? Exclude<U, Effect | Effect[]>
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: ExtPromise<T>;
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/**
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* Use this helper to unwrap return types from effects like Call / Apply
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* In the case of calling a function that returns a promise, this helper will unwrap the
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* promise and return the type inside it. In the case of calling another saga / generator,
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* this helper will return the actual return value of the saga / generator, otherwise,
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* it'll return the original type.
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*
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* NOTE 1: When using this to extract the type of a Saga, make sure to remove the `SagaIterator`
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* return type of the saga if it contains one, since that masks the actual return type of the saga.
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*
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* NOTE 2: You will most likely need to use the `typeof` operator to use this helper.
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* E.g type X = Yielded<typeof MyFunc/MySaga>
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*/
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declare global {
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export type Yielded<T> = T extends (...args: any[]) => any
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? ExtSaga<ReturnType<T>>
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: ExtPromise<T>;
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}
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