Excel with JavaScript

You can use the Yeoman Generator to create an Excel Add-in project using VS Code with JavaScript
The link above displays the contents of these three files:

package.json 
manifest.xml
webpack.config.js

This page displays all the other files in this project:

src\taskpane\taskpane.html 
src\taskpane\taskpane.js
src\taskpane\taskpane.css
src\commands\commands.html
src\commands\commands.js

taskpane.html

<!DOCTYPE html> 
<html>

<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Task Pane Add-in</title>
<script type="text/javascript" src="https://appsforoffice.microsoft.com/lib/1.1/hosted/office.js"></script>
<link rel="stylesheet" href="https://static2.sharepointonline.com/files/fabric/office-ui-fabric-core/9.6.1/css/fabric.min.css"/>
<link href="taskpane.css" rel="stylesheet" type="text/css" />
</head>

<body class="ms-font-m ms-welcome ms-Fabric">
<header class="ms-welcome__header ms-bgColor-neutralLighter">
<img width="90" height="90" src="../../assets/logo-filled.png" alt="Contoso" title="Contoso" />
<h1 class="ms-font-su">Welcome</h1>
</header>
<section id="sideload-msg" class="ms-welcome__main">
<h2 class="ms-font-xl">Please sideload your add-in to see app body.</h2>
</section>
<main id="app-body" class="ms-welcome__main" style="display: none;">
<h2 class="ms-font-xl"> Discover what Office Add-ins can do for you today! </h2>
<ul class="ms-List ms-welcome__features">
<li class="ms-ListItem">
<i class="ms-Icon ms-Icon--Ribbon ms-font-xl"></i>
<span class="ms-font-m">Achieve more with Office integration</span>
</li>
<li class="ms-ListItem">
<i class="ms-Icon ms-Icon--Unlock ms-font-xl"></i>
<span class="ms-font-m">Unlock features and functionality</span>
</li>
<li class="ms-ListItem">
<i class="ms-Icon ms-Icon--Design ms-font-xl"></i>
<span class="ms-font-m">Create and visualize like a pro</span>
</li>
</ul>
<p class="ms-font-l">Modify the source files, then click <b>Run</b>.</p>
<div role="button" id="run" class="ms-welcome__action ms-Button ms-Button--hero ms-font-xl">
<span class="ms-Button-label">Run</span>
</div>
</main>
</body>
</html>

taskpane.ts

Office.onReady(info => { 
if (info.host === Office.HostType.Excel) {
document.getElementById("sideload-msg").style.display = "none";
document.getElementById("app-body").style.display = "flex";
document.getElementById("run").onclick = run;
}
});

export async function run() {
  try {
    await Excel.run(async context => {
      /**
       * Insert your Excel code here
       */
      const range = context.workbook.getSelectedRange();

      // Read the range address
      range.load("address");

      // Update the fill color
      range.format.fill.color = "yellow";

      await context.sync();
      console.log(`The range address was ${range.address}.`);
    });
  } catch (error) {
    console.error(error);
  }

taskpane.css

html, 
 body {
     width: 100%;
     height: 100%;
     margin: 0;
     padding: 0;
 }
 
 ul {
     margin: 0;
     padding: 0;
 }
 
 .ms-welcome__header {
    padding: 20px;
    padding-bottom: 30px;
    padding-top: 100px;
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    align-items: center;
 }

 .ms-welcome__main {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-direction: column;
    flex-direction: column;
    -webkit-flex-wrap: nowrap;
    flex-wrap: nowrap;
    -webkit-align-items: center;
    align-items: center;
    -webkit-flex: 1 0 0;
    flex: 1 0 0;
    padding: 10px 20px;
 }
 
 .ms-welcome__main > h2 {
     width: 100%;
     text-align: center;
 }
 
 .ms-welcome__features {
     list-style-type: none;
     margin-top: 20px;
 }
 
 .ms-welcome__features.ms-List .ms-ListItem {
     padding-bottom: 20px;
     display: -webkit-flex;
     display: flex;
 }
 
 .ms-welcome__features.ms-List .ms-ListItem > .ms-Icon {
     margin-right: 10px;
 }
 
 .ms-welcome__action.ms-Button--hero {
     margin-top: 30px;
 }
 
.ms-Button.ms-Button--hero .ms-Button-label {
  color: #0078d7;
}

.ms-Button.ms-Button--hero:hover .ms-Button-label,
.ms-Button.ms-Button--hero:focus .ms-Button-label{
  color: #005a9e;
  cursor: pointer;
}

b {
    font-weight: bold;
}

commands.html

<!DOCTYPE html> 
<html>
<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <script type="text/javascript" src="https://appsforoffice.microsoft.com/lib/1.1/hosted/office.js"></script>
</head>
<body>
</body>
</html>

commands.js

Office.onReady(info => { 
});

function action(event) {
  const message = {
    type: Office.MailboxEnums.ItemNotificationMessageType.InformationalMessage,
    message: "Performed action.",
    icon: "Icon.80x80",
    persistent: true
  }
  
  Office.context.mailbox.item.notificationMessages.replaceAsync("action", message);
  event.completed();
}

function getGlobal() {
  return (typeof self !== "undefined") ? self :
    (typeof window !== "undefined") ? window :
    (typeof global !== "undefined") ? global :
    undefined;
}

const g = getGlobal();
g.action = action;

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