RocketChat/Rocket.Chat

import { AleaRandomGenerator } from './AleaRandomGenerator';
import { RandomGenerator } from './RandomGenerator';
import { createAleaGeneratorWithGeneratedSeed } from './createAleaGenerator';

// cryptographically strong PRNGs available in modern browsers
export class BrowserRandomGenerator extends RandomGenerator {
    /**
     * @name Random.fraction
     * @summary Return a number between 0 and 1, like `Math.random`.
     * @locus Anywhere
     */
    fraction() {
        const array = new Uint32Array(1);
        window.crypto.getRandomValues(array);
        return array[0] * 2.3283064365386963e-10; // 2^-32
    }

    protected safelyCreateWithSeeds(...seeds: readonly unknown[]) {
        return new AleaRandomGenerator({ seeds });
    }

    insecure: RandomGenerator = createAleaGeneratorWithGeneratedSeed();
}