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27 lines
1.0 KiB
27 lines
1.0 KiB
/**
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Returns the type that is wrapped inside a `Promise` type.
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If the type is a nested Promise, it is unwrapped recursively until a non-Promise type is obtained.
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If the type is not a `Promise`, the type itself is returned.
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@example
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```
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import {PromiseValue} from 'type-fest';
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type AsyncData = Promise<string>;
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let asyncData: PromiseValue<AsyncData> = Promise.resolve('ABC');
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type Data = PromiseValue<AsyncData>;
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let data: Data = await asyncData;
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// Here's an example that shows how this type reacts to non-Promise types.
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type SyncData = PromiseValue<string>;
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let syncData: SyncData = getSyncData();
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// Here's an example that shows how this type reacts to recursive Promise types.
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type RecursiveAsyncData = Promise<Promise<string> >;
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let recursiveAsyncData: PromiseValue<RecursiveAsyncData> = Promise.resolve(Promise.resolve('ABC'));
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```
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*/
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export type PromiseValue<PromiseType, Otherwise = PromiseType> = PromiseType extends Promise<infer Value>
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? { 0: PromiseValue<Value>; 1: Value }[PromiseType extends Promise<unknown> ? 0 : 1]
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: Otherwise;
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