`outof`, the valibot utility method, that is a type guard for the `Output` type of the schema as like as the `is` does for `Input` type. In addition, you can use the parsed value if you specify `then` arg.

outof.ts

const outof = <T extends BaseSchema, R,
  O = T extends BaseSchema<any, infer O> ? O : never,
>(schema:T, value:unknown, then?:(value:O) => R): value is O => {
  const {issues, output} = safeParse(schema, value);
  if (issues && issues.length > 0) return false;
  if (then) then(output as O);
  return true;
};

// USAGE example
const processThing = (thing:unknown) => {
  outof(FooSchema, thing, foo => {
    // using as foo
  })) ||
  outof(BarSchema, thing, bar => {
    // using as bar
  }));
};