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const rotate2D = Fn(({pos,angle})=>{
  const s = sin(angle);
  const c = cos(angle);
  const m = mat2(c, s, s.mul(-1), c);
  return m.mul(pos);
})

const rotate3D = Fn(({pos,axis,angle})=>{
  const axisNorm = normalize(axis);
  const s = sin(angle);

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Please consider using http://lygia.xyz instead of copy/pasting this functions. It expand suport for voronoi, voronoise, fbm, noise, worley, noise, derivatives and much more, through simple file dependencies. Take a look to https://github.com/patriciogonzalezvivo/lygia/tree/main/generative

Generic 1,2,3 Noise

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);

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float fixedpow(float a, float x)
{
    return pow(abs(a), x) * sign(a);
}

float cbrt(float a)
{
    return fixedpow(a, 0.3333333333);
}

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#define PI 3.1415926538

const float EPS = 0.001;
vec4 mod289(vec4 x) {
    return x - floor(x * (1.0 / 289.0)) * 289.0;
}
float mod289(float x) {
    return x - floor(x * (1.0 / 289.0)) * 289.0;
}
vec4 permute(vec4 x) {

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//
// GLSL textureless classic 3D noise "cnoise",
// with an RSL-style periodic variant "pnoise".
// Author:  Stefan Gustavson (stefan.gustavson@liu.se)
// Version: 2011-10-11
//
// Many thanks to Ian McEwan of Ashima Arts for the
// ideas for permutation and gradient selection.
//
// Copyright (c) 2011 Stefan Gustavson. All rights reserved.

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var     express = require('express'),
        app = express(),
        https = require('https'),
        fs = require('fs'),
        keys = require( "keygrip" )(['secret1', 'secret2']),
        cookies = require( "cookies" );

// This line is from the Node.js HTTPS documentation
var options = {
  key: fs.readFileSync('private_key_cert.pem'),

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The Ultimate Unit Testing Cheat-sheet

For Mocha, Chai and Sinon

using mocha/chai/sinon for node.js unit-tests? check out my utility: mocha-stirrer to easily reuse test components and mock require dependencies

---

• Sinon Chai
• Chai
• Sinon
• Mocha

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// https://gist.github.com/Hammster/5ea6ec71fef5cc16f7834f79130ea3a0
const crypto = require('crypto'); // node js core module
// larger numbers mean better security, less
const config = {
    // size of the generated hash at least 8 bytes and dont over 20 bytes
    hashBytes: 12,
    // larger salt means hashed passwords are more resistant to rainbow table, but
    // you get diminishing returns pretty fast recommend 16 bytes
    saltBytes: 16,
    // more iterations means an attacker has to take longer to brute force an

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var express = require('express')
var parseurl = require('parseurl')
var session = require('express-session')

var app = express()

app.use(session({
  secret: 'keyboard cat',
  resave: false,
  saveUninitialized: true

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// the main app file
import express from "express";
import loadDb from "./loadDb"; // dummy middleware to load db (sets request.db)
import authenticate from "./authentication"; // middleware for doing authentication
import permit from "./permission"; // middleware for checking if user's role is permitted to make request

const app = express(),
      api = express.Router();

// first middleware will setup db connection