When you create projects and workspaces using the strict mode, you'll notice an additional package.json file, located in:
This file informs tools and bundlers that the code under this directory is free of non-local side effects.
Non-local side effects in the application code are not common and using them is not considered a good coding pattern. More importantly, code with these types of side effects cannot be optimized, resulting in increased bundle sizes and applications that load more slowly.
Hope this is helpfull information !!