@cantoo/pdf-lib/es/utils/rng.js

Create and modify PDF files with JavaScript

/**
 * Generates a pseudo random number. Although it is not cryptographically secure
 * and uniformly distributed, it is not a concern for the intended use-case,
 * which is to generate distinct numbers.
 *
 * Credit: https://stackoverflow.com/a/19303725/10254049
 */
export class SimpleRNG {
    constructor(seed) {
        this.seed = seed;
    }
    nextInt() {
        const x = Math.sin(this.seed++) * 10000;
        return x - Math.floor(x);
    }
}
SimpleRNG.withSeed = (seed) => new SimpleRNG(seed);
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