typescript/no-non-null-asserted-optional-chain Correctness ​
What it does ​
Disallow non-null assertions after an optional chain expression.
Why is this bad? ​
?. optional chain expressions provide undefined if an object is null or undefined. Using a ! non-null assertion to assert the result of an ?. optional chain expression is non-nullable is likely wrong.
Most of the time, either the object was not nullable and did not need the ?. for its property lookup, or the ! is incorrect and introducing a type safety hole.
Example ​
ts
foo?.bar!;
foo?.bar()!;