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20 lines
637 B
20 lines
637 B
/**
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Returns the type that is wrapped inside a `Promise` type.
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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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```
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*/
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export type PromiseValue<PromiseType, Otherwise = PromiseType> = PromiseType extends Promise<infer Value> ? Value : Otherwise;
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