Repro_getcontext_from_comp_inside_each

This is a minimal reproduction of a "Function called outside component initialization" error that I ran into in a real app, and my various attempts to figure out the cause and resolution of the error.

More information can be found in this question: https://stackoverflow.com/questions/64152594/should-svelte-libraries-include-external-svelte-in-rollup-config-js-func

To build this app:

1. npm i

2. Build its dependency:

   cd packages/my-new-component/
   npx rollup -c -w
   

3. Build the app:

   npx rollup -c -w