TypeScript Version:
4.1.2 and newer

Search Terms:
rest elements, variadic tuple types

Code

type Numbers = number[];
type test = [...Numbers, string];

Expected behavior:
It should compile as it does in 4.0.5

Actual behavior:
tsc fails with the following (3.x like) error message

A rest element must be last in a tuple type.

Playground Link:
https://www.typescriptlang.org/play?ts=4.1.2#code/C4TwDgpgBAcgrgWwEYQE4GcoF4oDtEqoDaAugNwBQokUwE6w2URAdG-MmugDRQOoBLXAHNyQA

Related Issues: