import type { AnyNonPromise } from '@xylabs/promise';
import type { AsTypeFunction } from './AsTypeFunction.ts';
import type { TypeCheck } from './types.ts';
/**
 * Factory for creating type-narrowing 'as' functions that cast a value to T or return undefined.
 * Supports optional assertion messages and configuration for required/optional behavior.
 */
export declare const AsTypeFactory: {
    create: <T extends AnyNonPromise>(typeCheck: TypeCheck<T>) => AsTypeFunction<T>;
    createOptional: <T extends AnyNonPromise>(typeCheck: TypeCheck<T>) => (value: AnyNonPromise) => T | undefined;
};
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