export declare const pattern: RegExp;
/**
 * @internal @hidden
 */
export declare function parse(flag: string | number): number;
/**
 * @internal @hidden
 */
export declare function toString(flag: number): string;
/**
 * @internal @hidden
 */
export declare function toNumber(flag: string): number;
/**
 * Parses a flag as a mode (W_OK, R_OK, and/or X_OK)
 * @param flag the flag to parse
 * @internal @hidden
 */
export declare function toMode(flag: number): number;