is-truthy-ts
A type predicate for truthy values
Install
npm install is-truthy-tsThe problem
Often you want to filter out nullish values from an array, but typescript doesn't type the result correctly by default:
const arrayWithNulls = [1, 2, null, 4];
const filtered = arrayWithNulls.filter(Boolean);
// ❌ The type of filtered is (number | null)[]Solution
import { isTruthy } from 'is-truthy-ts';
const arrayWithNulls = [1, 2, null, 4];
const filtered = arrayWithNulls.filter(Boolean);
// ✅ The type of filtered is number[]