/** Accepts non-null object records while excluding arrays; custom prototypes remain valid. */
export declare function isRecordObject(value: unknown): value is Record<string, unknown>;
/** Accepts only ordinary JSON-style records, including null-prototype dictionaries. */
export declare function isPlainRecord(value: unknown): value is Record<string, unknown>;
/** Fail closed when an untrusted record contains a field outside its typed contract. */
export declare function hasOnlyKeys(record: Record<string, unknown>, allowed: readonly string[]): boolean;
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