Evangelize yarn! A userscript to swap the npm install snippet with yarn.

Yarnify

// ==UserScript==
// @name         Yarnify
// @namespace    http://gbasil.dev/
// @version      1.0
// @description  Evangelize yarn! Replace the npm install with yarn, and affix --dev to type definitions.
// @author       Basil
// @match        https://www.npmjs.com/package/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=npmjs.com
// @grant        none
// ==/UserScript==

// Install with yarn
document.querySelector('[tabindex="0"]').childNodes[0].textContent = 'yarn add ';

// Install types as dev dependencies
if (
    document.querySelector('[tabindex="0"]').childNodes[2].textContent.startsWith('@types/')
) document.querySelector('[tabindex="0"]').childNodes[2].textContent += ' --dev';