/**
 * Pure, DOM-free WhatsApp markup helpers.
 *
 * WhatsApp messages are plain text with lightweight inline markers — *not* HTML.
 * The string the user types (and that you send to the WhatsApp API) IS the
 * source of truth. These helpers only:
 *
 * - `toPreviewHTML(text)` — render a faithful preview of how WhatsApp displays
 *   the markers (bold/italic/strikethrough/monospace, quotes, lists, breaks).
 * - `toggleMarker(value, start, end, marker)` — wrap/unwrap a textarea selection
 *   with an inline marker (powers the toolbar + keyboard shortcuts).
 *
 * Supported syntax (per WhatsApp's "How to format your messages"):
 * - `*bold*`            → <strong>
 * - `_italic_`          → <em>
 * - `~strikethrough~`   → <del>
 * - `` `inline mono` `` → <code>
 * - ```` ```block``` ```` → <pre><code>
 * - `> quote`           → <blockquote>
 * - `- ` / `* ` bullet  → <ul><li>
 * - `1. ` numbered      → <ol><li>
 */
/** Inline marker identifiers exposed to the toolbar. */
export type WhatsappMarker = 'bold' | 'italic' | 'strikethrough' | 'monospace';
/** Line-prefix block identifiers exposed to the toolbar. */
export type WhatsappBlock = 'blockquote' | 'bullet' | 'ordered';
/** The literal characters each inline marker wraps the selection with. */
export declare const WHATSAPP_MARKERS: Record<WhatsappMarker, string>;
/** Result of a {@link toggleMarker} operation. */
export interface WrapResult {
    /** The new full text value. */
    value: string;
    /** New selection start, so the caller can restore the textarea selection. */
    selectionStart: number;
    /** New selection end. */
    selectionEnd: number;
}
/**
 * Render WhatsApp markup to preview HTML. Output is safe: all user text is
 * HTML-escaped before markers are interpreted.
 */
export declare function toPreviewHTML(text: string): string;
/**
 * Toggle an inline marker around a textarea selection. If the selection (or the
 * characters immediately surrounding it) is already wrapped with `marker`, it is
 * unwrapped; otherwise the selection is wrapped. Returns the new value and the
 * selection range to restore.
 */
export declare function toggleMarker(value: string, start: number, end: number, marker: string): WrapResult;
/**
 * Whether the current selection is already wrapped with `marker` — true when the
 * selection itself includes the markers (`*bold*` selected) or when they sit
 * immediately outside it (`*|bold|*`). Mirrors {@link toggleMarker}'s unwrap
 * cases so a toolbar can reflect the active state of a button. Pure.
 */
export declare function isMarkerActive(value: string, start: number, end: number, marker: string): boolean;
/**
 * Toggle a line-prefix block (blockquote, bullet or numbered list) across every
 * line spanned by the selection. If all non-empty lines already carry the
 * prefix it is removed; otherwise it is added (numbered lists are renumbered
 * from 1). Returns the new value with the selection spanning the affected block.
 */
export declare function toggleLinePrefix(value: string, start: number, end: number, kind: WhatsappBlock): WrapResult;
/**
 * Strip every WhatsApp marker from `text`, returning the plain underlying
 * content: removes inline bold/italic/strikethrough/monospace (including nested
 * combinations), fenced code blocks, and line-prefix blocks (quote/bullet/
 * numbered). Pure and idempotent.
 */
export declare function stripFormatting(text: string): string;