/**
 * @param n - target length
 * @param ch - pad character(s)
 */
export declare const padLeft: (n: number, ch?: string | number) => (x: any, length?: number) => string;
/**
 * Zero-padded 2 digit formatter.
 */
export declare const Z2: (x: any, length?: number) => string;
/**
 * Zero-padded 3 digit formatter.
 */
export declare const Z3: (x: any, length?: number) => string;
/**
 * Zero-padded 4 digit formatter.
 */
export declare const Z4: (x: any, length?: number) => string;
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