import type { MessageOrError } from "./error-from-message.js";
/**
 * Assert the given value is not null or undefined.
 * Throws with the given message or error, otherwise.
 */
export declare function assertDefined<T>(value: T, messageOrError: MessageOrError): asserts value is NonNullable<T>;
/**
 * Guard to filter out null or undefined values.
 */
export declare const isDefined: <T>(obj: T) => obj is NonNullable<T>;
/**
 * Coerce a value's type to exclude null or undefined, or throw
 * if it actually is null or undefined.
 */
export declare const expectDefined: <T>(obj: T, messageOrError: MessageOrError) => NonNullable<T>;
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