export type IndentStyle = "space" | "tab";
export declare const LEADING_BLANKS: RegExp;
/**
 * Convert the leading indentation of every line in `source` between spaces and tabs.
 *
 * Only whole `indentWidth`-space groups are converted to tabs; any remainder
 * (e.g. alignment padding that isn't a full indent level) is left as spaces.
 * Existing tabs are expanded to `indentWidth` spaces before conversion, so
 * mixed indentation is normalized regardless of the target `indentStyle`.
 */
export declare function convertIndentation(source: string, indentWidth: number, indentStyle: IndentStyle): string;