Before re-deploy i want to clear global variable

General
1

Before re-deploy i want to clear global variable content how to do that ?

2

You can delete it manually in the Context side-bar or by using an Inject and Change node.

However, there are no runtime events available to trigger a flow automatically.

3

Make sure that you do a full deploy, that clears all in-memory variables I think.
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4

I believe you can also use JS in a function node:

global.set('variableName',undefined);