import { refinement } from "https://deno.land/x/fun@v2.0.0-alpha.6/mod.ts";
const { undefinable } = refinement;
Type Parameters
B extends A
Parameters
or: Refinement<A, B>
Returns
Refinement<A | undefined, B | undefined>
x/fun/mod.ts>refinement.undefinable
import { refinement } from "https://deno.land/x/fun@v2.0.0-alpha.6/mod.ts";
const { undefinable } = refinement;