Before You File a Proposal Please Confirm You Have Done The Following...

• I havesearched for related issues and found none that match my proposal.
• I have searched thecurrent rule list and found no rules that match my proposal.
• I haveread the FAQ and my problem is not listed.

My proposal is suitable for this project

• I believe my proposal would be useful to the broader TypeScript community (meaning it is not a niche proposal).

Link to the rule's documentation

https://typescript-eslint.io/rules/no-unnecessary-type-assertion

Description

I propose that theno-unnecessary-type-assertion rule should also check for the return type of a function.

Fail

declarefunctionfoo():number;consta=foo()!;// no error reportconstb=foo()asnumber;// report error but bad fixed: `const b = foo() ; `constc=<number>foo();// good now

Pass

declarefunctionfoo():number;consta=foo();constb=foo();constc=foo();

Additional Info

Im ready to send a PR after the issue is marked with theaccepting prs label as indicated on the PR Checklist. Welcome to provide more test cases.