export type ByteOffsetTable = {
    byteOffsetAt(utf16Index: number): number;
};
/**
 * Maps a UTF-16 code-unit index to a UTF-8 byte offset in one pass.
 * tree-sitter reports `startIndex` in code units while a source anchor is
 * defined over bytes; on non-ASCII source the two diverge and a code-unit
 * index cuts a character in half.
 */
export declare function byteOffsetTable(source: string): ByteOffsetTable;