no-extra-non-null-assertion
Recommended
Disallows unnecessary non-null assertions
Disallows unnecessary non-null assertions
Non-null assertions are specified with an !
saying to the compiler that you
know this value is not null. Specifying this operator more than once in a row,
or in combination with the optional chaining operator (?
) is confusing and
unnecessary.
Invalid:
const foo: { str: string } | null = null;
const bar = foo!!.str;
function myFunc(bar: undefined | string) {
return bar!!;
}
function anotherFunc(bar?: { str: string }) {
return bar!?.str;
}
Valid:
const foo: { str: string } | null = null;
const bar = foo!.str;
function myFunc(bar: undefined | string) {
return bar!;
}
function anotherFunc(bar?: { str: string }) {
return bar?.str;
}