Tuple type
A fixed-length array with a known type at each position.
Syntax
[A, B, ...Rest[]]Examples
type Entry = [key: string, value: number];
const e: Entry = ['age', 36];
type Args = [first: string, ...rest: number[]];
const a: Args = ['x', 1, 2, 3];
Notes
Tuples constrain length and per-position types. They support optional
elements (`[number, string?]`), rest elements, and labeled positions for
readability. `as const` produces readonly tuples. Variadic tuple types enable
generic argument forwarding.