export type FlushKind = 'append' | 'write';
export declare const NO_WRITE: number;
/**
 * Decide what a closing whole-file buffer owes the mount.
 *
 * Every encoder buffers a whole file and has to answer the same
 * question at close: did this handle only add to the end, or did it
 * rewrite what was already there? Only the first can travel as a
 * delta, and answering "write" always is what makes an append loop
 * quadratic.
 *
 * Args:
 *   baseLen: length the file had when the handle opened.
 *   lowWrite: lowest offset this handle wrote at, or the NO_WRITE
 *     sentinel when it never wrote.
 *   buf: the handle's whole buffer.
 *
 * Returns:
 *   ['append', tail] when the handle only extended the file, else
 *   ['write', whole buffer].
 */
export declare function planFlush(baseLen: number, lowWrite: number, buf: Uint8Array): [FlushKind, Uint8Array];
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