Add copy button next to base ref name in PR header information

What the title says
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// ==UserScript==
// @name     Add copy button next to base ref name in PR header information
// @description What the title says
// @namespace ahappyviking
// @version  1
// @grant    none
// @match 	 https://github.com/*
// @require  https://unpkg.com/[email protected]/index.js
// @license MIT
// ==/UserScript==


const gh = githubUrlDetection

const addButton = () => {
  if (!gh.isPR()) return
  const baseRefNameParent = document.querySelector(".commit-ref.css-truncate.user-select-contain.base-ref")
  if (!baseRefNameParent) return
  const textContent = baseRefNameParent.querySelector("span")
  if (!textContent) return
  const button = generateButton(textContent.textContent)
  baseRefNameParent.appendChild(button)
}

const generateButton = (url) => {
    //Taken from Github source...
    const htmlStr = `<clipboard-copy data-copy-feedback="Copied!" aria-label="Copy" value="${url}" data-view-component="true" class="Link--onHover color-fg-muted ml-2 mr-2" tabindex="0" role="button">
    <svg aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-copy">
    <path d="M0 6.75C0 5.784.784 5 1.75 5h1.5a.75.75 0 0 1 0 1.5h-1.5a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-1.5a.75.75 0 0 1 1.5 0v1.5A1.75 1.75 0 0 1 9.25 16h-7.5A1.75 1.75 0 0 1 0 14.25Z"></path><path d="M5 1.75C5 .784 5.784 0 6.75 0h7.5C15.216 0 16 .784 16 1.75v7.5A1.75 1.75 0 0 1 14.25 11h-7.5A1.75 1.75 0 0 1 5 9.25Zm1.75-.25a.25.25 0 0 0-.25.25v7.5c0 .138.112.25.25.25h7.5a.25.25 0 0 0 .25-.25v-7.5a.25.25 0 0 0-.25-.25Z"></path>
    </svg>
    <svg style="display: none;" aria-hidden="true" height="16" viewBox="0 0 16 16" version="1.1" width="16" data-view-component="true" class="octicon octicon-check color-fg-success">
    <path d="M13.78 4.22a.75.75 0 0 1 0 1.06l-7.25 7.25a.75.75 0 0 1-1.06 0L2.22 9.28a.751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018L6 10.94l6.72-6.72a.75.75 0 0 1 1.06 0Z"></path>
    </svg>
    </clipboard-copy>`

    const template = document.createElement('template');
    template.innerHTML = htmlStr;
    const button = template.content.firstElementChild
    return button
}

addButton()
document.addEventListener("soft-nav:end", addButton); 
document.addEventListener("navigation:end", addButton);