How do I watch a file for changes using JS/Gnome Shell?

[Stefano Ciancio <s ciancio gmail com>]

Hi all,

i have a configuration file written by a little python interface. I want 
to watch for changes of config file in gnome shell extension.
Each time a change occurs I'd like to reload new data in my extension.

What's the best way to do this?

If anyone's done anything like this I'd be really grateful to hear how...

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   Stefano