--- /dev/null
+/**
+Returns the type that is wrapped inside a `Promise` type.
+If the type is not a `Promise`, the type itself is returned.
+
+@example
+```
+import {PromiseValue} from 'type-fest';
+
+type AsyncData = Promise<string>;
+let asyncData: PromiseValue<AsyncData> = Promise.resolve('ABC');
+
+type Data = PromiseValue<AsyncData>;
+let data: Data = await asyncData;
+
+// Here's an example that shows how this type reacts to non-Promise types.
+type SyncData = PromiseValue<string>;
+let syncData: SyncData = getSyncData();
+```
+*/
+export type PromiseValue<PromiseType, Otherwise = PromiseType> = PromiseType extends Promise<infer Value> ? Value : Otherwise;