export declare function toOptionsObject(input: unknown): Record<string, unknown>;
export declare function rejectUnknownKeys(input: Record<string, unknown>, allowedKeys: readonly string[]): void;
export declare function readOptionalString(input: Record<string, unknown>, key: string): string | undefined;
export declare function readOptionalStringArray(input: Record<string, unknown>, key: string): string[] | undefined;
export declare function readOptionalNonNegativeInteger(input: Record<string, unknown>, key: string): number | undefined;
export declare function readRequiredEnum<T extends string>(input: Record<string, unknown>, key: string, allowedValues: readonly T[]): T;