/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 */
import type { CodeHighlightNode } from './CodeHighlightNode';
import type { LexicalNode, LineBreakNode, RangeSelection, TabNode } from 'lexical';
export declare function $getFirstCodeNodeOfLine(anchor: CodeHighlightNode | TabNode | LineBreakNode): CodeHighlightNode | TabNode | LineBreakNode;
export declare function $getLastCodeNodeOfLine(anchor: CodeHighlightNode | TabNode | LineBreakNode): CodeHighlightNode | TabNode | LineBreakNode;
/**
 * Determines the visual writing direction of a code line.
 *
 * Scans the line segments (CodeHighlightNode/TabNode) from start to end
 * and returns the first strong direction found ("ltr" or "rtl").
 * If no strong character is found, falls back to the parent element's
 * direction. Returns null if indeterminate.
 */
export declare function $getCodeLineDirection(anchor: CodeHighlightNode | TabNode | LineBreakNode): 'ltr' | 'rtl' | null;
export declare function $getStartOfCodeInLine(anchor: CodeHighlightNode | TabNode, offset: number): null | {
    node: CodeHighlightNode | TabNode | LineBreakNode;
    offset: number;
};
export declare function $getEndOfCodeInLine(anchor: CodeHighlightNode | TabNode): CodeHighlightNode | TabNode;
/**
 * Plain split of code text into CodeHighlightNodes (with no highlight
 * type) + LineBreakNodes + TabNodes. Used when the tokenizer opts out
 * of a default language so a previously highlighted block still
 * renders its `\n` / `\t` as real line breaks / tabs, while staying
 * compatible with the indent / shift-lines handlers that only accept
 * CodeHighlightNode + TabNode + LineBreakNode inside a CodeNode.
 */
export declare function $plainifyCodeContent(text: string): LexicalNode[];
/**
 * Strip up to `tabSize` leading spaces from a {@link CodeHighlightNode} that
 * starts a code line, to support outdenting space-indented code lines (e.g.
 * code formatted with prettier). Returns true if any spaces were stripped.
 *
 * Best-effort: a line with fewer than `tabSize` leading spaces has all of
 * them stripped, matching VS Code / IntelliJ behavior.
 *
 * Selection is preserved relative to line content. Anchor/focus offsets
 * pointing into `node` shift left by the number of stripped characters
 * (clamped to 0). The underlying TextNode mutation does not adjust
 * selection offsets that already point into the old text, so we patch
 * them up explicitly.
 */
export declare function $outdentLeadingSpaces(node: CodeHighlightNode, tabSize: number, selection: RangeSelection): boolean;