export type RandomSource = () => number;
/**
 * 0 ~ 2^32-1の範囲の整数乱数を返す関数を返す
 * @param seed
 */
export declare const createRandomSource: (seed: number) => RandomSource;
export declare const createRandomHelper: (next: RandomSource) => {
    next: RandomSource;
    nextString: (length: number) => string;
    nextInt: (min: number, max: number) => number;
    nextSnowflake: () => string;
    nextDate: (min: Date, max: Date) => Date;
    nextColor: () => number;
};
/**
 * 指定した長さのランダムな文字列を返す
 * 文字には英大文字、英小文字、数字が使われる
 * 文字列の数だけ乱数を消費する
 */
export declare const nextString: (next: RandomSource) => (length: number) => string;
/**
 * min以上max未満の範囲のランダムな整数を返す
 */
export declare const nextInt: (next: RandomSource) => (min: number, max: number) => number;
/**
 * ダミーのsnowflakeIdを生成する
 * 19桁の10進整数文字列を返す
 */
export declare const nextSnowflake: (next: RandomSource) => () => string;
export declare const nextDate: (next: RandomSource) => (min: Date, max: Date) => Date;
export declare const nextColor: (next: RandomSource) => () => number;
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