Namespace assert

The specific Error type thrown by assertions.

Asserts that a condition is true. Throws an exception if it's not.

As assert, but isn't skipped in production.

Assert that a type is never when type checking. Throws an unreachable exception if it's reached at runtime. This is meant as an exhaustiveness check.

Tests whether a value is an AsyncIterable.

Tests whether a value is null, undefined, false, an empty array or an empty string.

Tests whether a value is an Iterable.

Tests whether a value is null or undefined.

Returns the given value unchanged if it's neither null nor undefined. Throws an exception otherwise.

Throws an exception used to mark unreachable code.