/**
 * Truncate without splitting UTF-8 sequences or UTF-16 surrogate pairs.
 * The input is streamed by code point so a very large string is never copied
 * in full before its security budget is applied.
 */
export declare function truncateUtf8(value: string, maxBytes: number, suffix?: string): string;
export declare function boundedRemoteText(value: unknown, maxBytes: number): string;
export declare function boundedRemoteTextPreservingWhitespace(value: unknown, maxBytes: number): string;
/**
 * Remove unsafe code points (C0/C1 controls, bidi controls, zero-width/BOM,
 * unpaired surrogates) without truncation or whitespace changes. Transcript
 * lines must be sanitized without the byte truncation boundedRemoteText
 * applies, so legitimate long subtitle data is preserved.
 */
export declare function sanitizeRemoteText(value: unknown): string;
export declare function boundedFiniteInteger(value: unknown, fallback?: number): number;
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