no-non-null-asserted-optional-chain
)Optional chain expressions are designed to return undefined
if the optional property is nullish. Using non-null assertions after an optional chain expression is wrong, and introduces a serious type safety hole into your code.
Examples of incorrect code for this rule:
/* eslint @typescript-eslint/no-non-null-asserted-optional-chain: "error" */ foo?.bar!; foo?.bar!.baz; foo?.bar()!; foo?.bar!(); foo?.bar!().baz;
Examples of correct code for this rule:
/* eslint @typescript-eslint/no-non-null-asserted-optional-chain: "error" */ foo?.bar; (foo?.bar).baz; foo?.bar(); foo?.bar(); foo?.bar().baz;
If you are not using TypeScript 3.7 (or greater), then you will not need to use this rule, as the operator is not supported.