So I have package 1 that I wrote in Typescript that contains mocha tests and I'm pretty sure that it works as it should. I push all the code to the git provider and pull it via npm on package 2. When I start React with Typescript on package 2, I get the following:

I tried adding webpack.config.js, various tsconfig.json configuration changes and multiple npm commands that are connected to cache cleaning and reinstalling but nothing works. This error is just plain weird because, from what I know, there shouldn't be any compilation errors regarding class variables.

CodePudding user response：

FIX

This was a very quick fix. So, in short, if the provider with which you started your Typescript application doesn't provide you with webpack or babel file you will have to transpile any module from node_modules into Javascript that you try to import. In this case I just transpiled package 1 and package 2 worked perfectly.