Function is

import { is } from "typerun";
import { number } from "typerun/schema";

const data: unknown = 3;

if (is(number)(data)) {
  console.log(data * 3);
}
Copy

Returns ((data) => data is S)

A function returning a boolean that indicates whether the input matches the schema. The function is a type predicate, meaning that after testing the return value, TypeScript will now that the unknown input is of the tested type.

• • (data): data is S

  • Parameters

    • data: unknown

    Returns data is S