In order to define a widget in a tiddler, the tiddler must satisfy these requirements:

• type field is application/javascript
• module-type field is widget
• the text field contains the javascript code

The donothing.js tiddler fulfills the requirements and its code looks like this:

/*\

Do nothing widget

\*/
(function(){

/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";

var Widget = require("$:/core/modules/widgets/widget.js").widget;

exports.donothing = Widget;

})();

That code does 2 key things:

• Imports the core Widget class ($:/core/modules/widgets/widget.js)
• exports the class in an attribute with the name we want our widget to have (donothing)

Here's what it looks like:

And it worked. No error message this time.

Exercise: Modify donothing.js and Do nothing widget demo so the widget is named noop instead of donothing