Question on displaying custom widget on the cart page.

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I'm quite new to Shopify app development.

I have researched that the most common way, currently, is injecting through type_script I believe to display to app widget on the cart page. 

Question 1. 

Is there better way than injecting the js through type_script? including custom CSS.

Question 2.

If there is another App that displays their app widget, does the Shopify displays it in the order of installation date? or is there another algorithm/API that decides which one to display first(above) the other app widget?


Thank you for your time.