This is to align with the folder structure of version 8, were tsconfigs are outside of the `src` folder
Also, this change remove the dud `tsconfig.json` in the `src` folder and instead we add the triple slash lib reference `/// <reference lib="webworker" />` for IDE support.
The generated snippet was:
worker.onmessage = ({ data }) => {
console.log('page got message: $\{data\}');
};
which doesn't use a template string and so does not log `data`.
Fixes the generated snippet to be `console.log(`page got message: ${data}`);`.
Also adds a newline at the end of the web worker template to not fail the default TSLint rules if the schematic is used.
