/** Inline formatting range — tracks formatting on plain text. */
export interface FormatRange {
    start: number;
    end: number;
    type: "bold" | "italic" | "code" | "strikethrough" | "link";
    url?: string;
}
/** Plain text + formatting ranges — no markdown syntax visible. */
export interface InlineModel {
    text: string;
    formats: FormatRange[];
}
/** Parse inline markdown into plain text + formatting ranges. */
export declare function parseInlineModel(markdown: string): InlineModel;
/** Serialize InlineModel back to markdown. */
export declare function modelToMarkdown(model: InlineModel): string;
/**
 * Adjust format ranges after text input.
 * Call this when textarea content changes.
 */
export declare function adjustFormats(formats: FormatRange[], changePos: number, delta: number): FormatRange[];
/**
 * Reconcile format ranges with a textarea edit.
 *
 * `adjustFormats` describes one signed delta, which cannot express an edit that
 * deletes and inserts at once — paste over a selection, select-all-then-type,
 * drag-and-drop, IME/autocorrect replacement. Recovering a single delta from
 * such an edit leaves the ranges on unrelated characters.
 *
 * The `input` event carries no description of what changed, so derive it: the
 * inserted text ends at the cursor, which anchors the tail; the head is the
 * common prefix of what precedes it. That yields a delete and an insert, both
 * of which `adjustFormats` already handles.
 */
export declare function applyTextEdit(formats: FormatRange[], prevText: string, nextText: string, cursor: number): FormatRange[];
/** Check which format types are active at a cursor position. */
export declare function activeFormatsAt(formats: FormatRange[], start: number, end: number): Set<string>;
/** Toggle a format on a selection range. Returns updated formats array. */
export declare function toggleFormat(formats: FormatRange[], selStart: number, selEnd: number, type: "bold" | "italic" | "code" | "strikethrough"): FormatRange[];
/** Walk text nodes in a container, returning nodes with cumulative offsets. */
export declare function walkTextNodes(container: Node): {
    node: Text;
    start: number;
    end: number;
}[];
/** Map a DOM range (or StaticRange) to plain text offsets using a text node map. */
export declare function rangeToOffsets(range: {
    startContainer: Node;
    startOffset: number;
    endContainer: Node;
    endOffset: number;
}, textNodes: {
    node: Text;
    start: number;
    end: number;
}[]): {
    start: number;
    end: number;
} | null;
/** Apply CSS Custom Highlights from FormatRange[] onto DOM text nodes. */
export declare function applyHighlights(formats: FormatRange[], textNodes: {
    node: Text;
    start: number;
    end: number;
}[]): void;
/** Clear all markdown format highlights. */
export declare function clearHighlights(): void;
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