[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Types](https://evolu.dev/docs/api-reference/common/Types) › isPromiseLike

```ts
function isPromiseLike<T>(value: Awaitable<T>): value is PromiseLike<T>;
```

Defined in: [packages/common/src/Types.ts:412](https://github.com/evoluhq/evolu/blob/dd96d79f1dbe9a49fa12ce8e0aa7d3d0177795ca/packages/common/src/Types.ts#L412)

Type guard to check if a value is a [PromiseLike](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise#thenables).

Use with [Awaitable](https://evolu.dev/docs/api-reference/common/Types/type-aliases/Awaitable) to conditionally `await` only when necessary,
avoiding microtask overhead for synchronous values.

### Conditional awaiting

```ts

const cache = new Map([["cached", true]]);
const validate = (id: string): Awaitable<boolean> =>
  cache.get(id) ?? Promise.resolve(false);

const result = validate("cached");
const isValid = isPromiseLike(result) ? await result : result;

assertTrue(isValid);
```