How to add a button to a custom node similar to the Inject node?

Developing Nodes
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I thought that my node would automatically have a button to its left end by giving it no input port. But it turns out that it just becomes non-interactable.

How to make it interactable like Inject?

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As soon as you have a template, you already got the solution ... by checking the source code:

You may add a button by defining a button property in the nodes registerType function (html file) ... like it's done for the inject node.

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Also covered in the docs here Node appearance : Node-RED

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