/**
 * Asserts that the given value is non-nullable.
 *
 * @param value The value to test for nullability.
 * @param message The error message to use if an error is thrown.
 *
 * @throws Error If the value is nullable.
 */
export declare function assertDefined<A>(value: A | null | undefined, message?: string): asserts value is NonNullable<A>;
/**
 * Asserts that the given value is null or undefined.
 *
 * @param value The value to test for nullability.
 * @param message The error message to use if an error is thrown.
 *
 * @throws Error If the value is not undefined or null
 */
export declare function assertUndefined<A>(value: A | null | undefined, message?: string): asserts value is undefined | null;
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