/** Whether a string contains C0, DEL, or C1 control characters. */
export declare function hasControlCharacters(value: string): boolean;
/** Whether every UTF-16 surrogate is part of a valid pair. */
export declare function isWellFormedUtf16(value: string): boolean;
/** Whether a well-formed string fits within a UTF-8 byte budget. */
export declare function isUtf8WithinByteLimit(value: string, maxBytes: number): boolean;
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