Type Alias NonEmptyArray<A>

NonEmptyArray: readonly [A, ...readonly A[]]

Represents a readonly array that is guaranteed to have at least one element.

Type Parameters

A
The type of elements in the array.

Example

type NA = NonEmptyArray<number>; // readonly [number, ...number[]]
const valid: NA = [1];
const alsoValid: NA = [1, 2, 3];
// const invalid: NA = []; // Error
// valid.push(4); // Error: Property 'push' does not exist on type 'readonly [number, ...number[]]'.