import { invariant } from 'foxact/invariant';
 
invariant(true);
// => undefined
invariant(false);
// => undefined
invariant(0);
// => undefined
invariant('');
// => undefined
invariant(null);
// Error: Value is null or undefined
invariant(undefined);
// Error: Value is null or undefined
invariant();
// Error: Value is null or undefined
 
 
let value: string | null;
invariant(value);
console.log(value);
          // ^?: string

import { nullthrow } from 'foxact/nullthrow';
 
nullthrow(true);
// => undefined
nullthrow(false);
// => undefined
nullthrow(0);
// => undefined
nullthrow('');
// => undefined
nullthrow(null);
// Error: Value is null or undefined
nullthrow(undefined);
// Error: Value is null or undefined
nullthrow();
// Error: Value is null or undefined
 
let nullable: string | null;
const value = nullthrow(nullable);
console.log(value);
          // ^: string