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

```ts
const assertNonEmptyArray: <T>(
  arr: T[],
  message?: string,
) => asserts arr is NonEmptyArray<T>;
```

Defined in: [packages/common/src/Assert.ts:881](https://github.com/evoluhq/evolu/blob/ecbac001e0c18bbc45b44715f49ecc3a768c5ec9/packages/common/src/Assert.ts#L881)

Asserts that an array is non-empty.

### Example

```ts
import {
  assertEqual,
  assertErr,
  assertNonEmptyArray,
  assertType,
  trySync,
  type NonEmptyArray,
} from "@evolu/common";

const values = [1, 2, 3];
assertNonEmptyArray(values);
assertType<typeof values, NonEmptyArray<number>>();
assertEqual(values[0], 1);
const result = trySync(() => assertNonEmptyArray([]));
assertErr(result);
```