check

function check(value: boolean): asserts value is true

Throws an IllegalStateException if the value is false.

function check(
  value: boolean,
  lazyMessage: () => string
): asserts value is true

Throws an IllegalStateException with the result of calling lazyMessage if the value is false.

Samples

import { check } from 'kotlinic'

check(true)
check(false) // will fail with IllegalStateException
check(false, () => 'Lazy message') // will fail with IllegalStateException