how can use real time app node change item and send brodcast

I have a node backend and angular website and ionic app i want when anyone change for example price products send event to all users to load new data.

I am trying to use a socket io but I have a problem.

I have io variable in index.js and on connection all is oky but in a modules like product. I try to send io.emit not working but when i open new on connection in product it is worked

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