/**
 * Telegram outbound-text mechanics: the message size limit, deterministic
 * fitting under it, and the "message is not modified" edit no-op classifier.
 * Dependency-free and Worker-safe.
 */
/** Telegram's post-entity character limit for one message. */
export declare const TELEGRAM_MAX_CHARS = 4096;
export interface FitTelegramTextOptions {
    maxChars?: number;
    /** Retain a short final paragraph, useful for a summary's source/footer block. */
    preserveFinalBlock?: boolean;
}
/** Deterministically fit plain text to Telegram's post-entity character limit. */
export declare function fitTelegramText(text: string, opts?: FitTelegramTextOptions): string;
/**
 * Telegram rejects an edit whose result equals the current message with
 * "message is not modified". That is a no-op, not an error — the desired state
 * is already live. Callers treat it as delivered instead of falling back to a
 * degraded (e.g. plain-text) retry that WOULD differ and silently strip
 * formatting, or wrongly sending a duplicate.
 */
export declare function isNotModified(err: unknown): boolean;
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