/** Safely cast unknown to a Record, or null if not a plain object. */
export declare function asRecord(value: unknown): Record<string, unknown> | null;
/** Safely cast unknown to a trimmed non-empty string, or null. */
export declare function asString(value: unknown): string | null;
/** Safely cast unknown to a finite number, or null. */
export declare function asNumber(value: unknown): number | null;
/** Safely cast unknown to an array. Attempts JSON parse for string values. */
export declare function asArray(value: unknown): unknown[];
/** Extract a deduplicated string array from unknown. */
export declare function asStringArray(value: unknown): string[];