import { Question, Section } from './exam_components';
export declare class SeededRandomizer {
    private rng;
    constructor(seed: string);
    /**
     * @returns A random floating point number between 0 (inclusive) and 1 (exclusive).
     */
    float(): number;
    /**
     * @returns A random integer between 0 (inclusive) and n (exclusive).
     */
    range(n: number): number;
    /**
     * An old method for randomly choosing one element from an array. Does not
     * produce behavior consistent with `chooseN(choices, 1)`.
     * @deprecated Do not use in new code. Use `chooseOne(choices)` instead.
     */
    legacyChooseOne<T>(choices: readonly T[]): T;
    /**
     * @requires `choices` is non-empty.
     * @returns One of the elements of `choices`, selected randomly.
     */
    chooseOne<T>(choices: readonly T[]): T;
    /**
     * Randomly selects `n` elements from `choices` (repetition is not allowed).
     * @requires `choices` is non-empty and `n` is less than or equal to the length of `choices`.
     * @returns An array of `n` elements from `choices`, selected randomly.
     */
    chooseN<T>(choices: readonly T[], n: number): readonly T[];
    shuffle<T>(original: readonly T[]): T[];
}
export type Randomizer = SeededRandomizer;
export declare function createSectionChoiceRandomizer(student_randomization_seed: string): SeededRandomizer;
export declare function createQuestionChoiceRandomizer(student_randomization_seed: string, section: Section): SeededRandomizer;
export declare function createSectionSkinRandomizer(student_randomization_seed: string, section: Section): SeededRandomizer;
export declare function createQuestionSkinRandomizer(student_randomization_seed: string, question: Question): SeededRandomizer;