Type Alias Flat<T>

Flat: T extends readonly (infer E)[]
? (E extends readonly any[] ? E[number] : E)[]
: never

Flatten an array by one level.

Type Parameters

T extends readonly any[]
Array containing values or nested arrays

Remarks

If an element itself is an array, its element type is extracted. Non-array elements are preserved as-is.

Example

type Nested = ( number[] | string[] )[];
type Flat = Flat< Nested >; // ( number | string )[]