--- /dev/null
+/**
+Create a type that represents either the value or the value wrapped in `PromiseLike`.
+
+Use-cases:
+- A function accepts a callback that may either return a value synchronously or may return a promised value.
+- This type could be the return type of `Promise#then()`, `Promise#catch()`, and `Promise#finally()` callbacks.
+
+Please upvote [this issue](https://github.com/microsoft/TypeScript/issues/31394) if you want to have this type as a built-in in TypeScript.
+
+@example
+```
+import {Promisable} from 'type-fest';
+
+async function logger(getLogEntry: () => Promisable<string>): Promise<void> {
+ const entry = await getLogEntry();
+ console.log(entry);
+}
+
+logger(() => 'foo');
+logger(() => Promise.resolve('bar'));
+```
+*/
+export type Promisable<T> = T | PromiseLike<T>;