Ecommerce Shopify WordPress Discussion

Problems to develop a customized Shopify app

I am a beginner in Shopify app development and would like to develop an app using theme-app-extension. but i don't know how to communicate between store-front and backend. and also can't use node modules(like nodemailer and others) in my app. I build it with remix template. This is the errors(https://i.stack.imgur.com/aA4rG.png) Please help me. I seek to solve it but I can't get enough to run it. The app is installed in my dev store. But I can't get data from the theme app extension.
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