/**
 * Large-paste placeholders (INPUT-003, V2-042).
 *
 * A large paste is replaced in the visible buffer by a single short token so
 * it stays scannable and cheap to edit around; the real text is kept in a
 * registry and swapped back in at submit time. Because the placeholder is
 * inserted with one `insertText` call, it is one undo step — undoing it
 * removes the whole paste, not one character at a time.
 *
 * The composer also renders a blue chip above the input for each active
 * paste (hover preview + double-click expand).
 */
export interface PasteThresholds {
    readonly lines?: number;
    readonly chars?: number;
}
export declare function countLines(text: string): number;
export declare function isLargePaste(text: string, thresholds?: PasteThresholds): boolean;
/** First N non-empty-friendly lines for hover preview. */
export declare function pastePreviewLines(text: string, maxLines?: number): string[];
/** Blue chip label: "10 lines pasted" / "1 line pasted". */
export declare function pasteChipLabel(lines: number, chars: number): string;
export interface PastePlaceholderEntry {
    readonly id: number;
    /** Token inserted into the textarea (kept short for editing). */
    readonly token: string;
    readonly text: string;
    readonly lines: number;
    readonly chars: number;
    /** Human chip label (blue). */
    readonly label: string;
}
export declare function samePastePlaceholderEntries(a: readonly PastePlaceholderEntry[], b: readonly PastePlaceholderEntry[]): boolean;
/**
 * Holds full pasted text keyed by an incrementing id and renders the token
 * shown in the composer buffer in its place.
 */
export declare class PasteRegistry {
    private readonly entries;
    private nextId;
    register(text: string): PastePlaceholderEntry;
    resolve(id: number): PastePlaceholderEntry | undefined;
    /** Entries whose token still appears in the composer buffer. */
    activeIn(value: string): PastePlaceholderEntry[];
    clear(): void;
    /** Replace every known placeholder token in `value` with its full text. */
    expand(value: string): string;
    /** Expand a single paste id (double-click chip). */
    expandOne(value: string, id: number): string;
}