export declare const fromRadix: (x: string, r: number) => number;
export declare const len: <T>(arr: T[]) => number;
export declare const isNum: (x: unknown) => x is number;
export declare const substr: (str: string, start: number, length?: number) => string;
export declare const subIdx: (x: string, s: string) => number;
export declare const has: <T>(x: T[], y: T) => boolean;
export declare const replace: (str: string, what: string, to: string) => string;
export declare const rreplace: (str: string, what: string, to: string) => string;
export declare const concat: <T>(a: T[], b: T[]) => T[];
export declare const push: <T>(arr: T[], add: T[]) => number;
export declare const reverse: <T>(arr: T[]) => T[];
export declare const lowerCase: (str: string) => string;
export declare const upperCase: (str: string) => string;
export declare const trim: (str: string) => string;
export declare const trimStart: (str: string) => string;
export declare const trimEnd: (str: string) => string;
export declare const padEnd: (str: string, by: number) => string;
export declare const charCode: (str: string) => number;
export declare const codeChar: (num: number) => string;
export declare const randNum: (a: number, b: number) => number;
export declare const randInt: (a: number, b: number) => number;
export declare const range: (len: number) => number[];
export declare const objKeys: (x: object) => string[];
export declare const objVals: (x: object) => any[];