/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */
import { Mark, Root, Skip } from "./delta";
export declare const emptyDelta: Root<never>;
/**
 * Returns the number of nodes in the input tree that the mark affects or skips.
 */
export declare function inputLength(mark: Mark<unknown>): number;
export declare function isSkipMark(mark: Mark<unknown>): mark is Skip;
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