/**
 * Normalise CRLF sequences in `chunk` to LF. Lone `\r` (old Mac OS 9 line
 * endings, pre-2001) is not supported and passes through unchanged.
 *
 * A `\r` at the very end of a chunk is held in `state.pendingCR` so that a
 * `\r\n` pair split across a chunk boundary is still collapsed to a single
 * `\n`.
 * @param chunk - The incoming text chunk to normalise.
 * @param state - Mutable state shared between chunk invocations.
 * @param state.pendingCR - Whether a `\r` was held over from the previous chunk.
 * @returns The chunk with CRLF sequences replaced by LF.
 */
export declare function normaliseChunk(chunk: string, state: {
    pendingCR: boolean;
}): string;
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