import type { FormatContentModelContext, ReadonlyContentModelDocument, ReadonlyContentModelParagraph } from 'roosterjs-content-model-types';
/**
 * @internal
 The handleTabOnParagraph function will handle the tab key in following scenarios:
 * 1. When the selection is collapsed and the cursor is at the end of a paragraph, add 4 spaces.
 * 2. When the selection is collapsed and the cursor is at the start of a paragraph, add 4 spaces.
 * 3. When the selection is collapsed and the cursor is at the middle of a paragraph, add 4 spaces.
 * 4. When the selection is not collapsed, replace the selected range with a single space.
 * 5. When the selection is not collapsed, but all segments are selected, call setModelIndention function to indent the whole paragraph
 The handleTabOnParagraph function will handle the shift + tab key in a indented paragraph in following scenarios:
 * 1. When the selection is collapsed and the cursor is at the end of a paragraph, remove 4 spaces.
 * 2. When the selection is collapsed and the cursor is at the start of a paragraph, call setModelIndention function to outdent the whole paragraph
 * 3. When the selection is collapsed and the cursor is at the middle of a paragraph, remove 4 spaces.
 * 4. When the selection is not collapsed, replace the selected range with a 4 space.
 * 5. When the selection is not collapsed, but all segments are selected, call setModelIndention function to outdent the whole paragraph
 */
export declare function handleTabOnParagraph(model: ReadonlyContentModelDocument, paragraph: ReadonlyContentModelParagraph, rawEvent: KeyboardEvent, context?: FormatContentModelContext): boolean;