split.ts

split.ts

type Split<
  V extends string,
  S extends string,
> = V extends `${infer Head}${S}${infer Rest}`
  ? [Head, ...Split<Rest, S>]
  : Array<V>;

const split = <V extends string, S extends string>(
  value: V,
  separator: S,
): Split<V, S> => String.split(value, separator) as any;

type V1 = 'foo' | 'bar' | 'baz';
type V2 = 'foa' | 'bor' | 'boz';
type V = `${V1}-${V2}`;
const value: V = `foo-foa`;

const [a, b] = split(value, '-');
const r2 = split('foo', '-');