Closed
Description
Before You File a Bug Report Please Confirm You Have Done The Following...
- I have tried restarting my IDE and the issue persists.
- I have updated to the latest version of the packages.
- I have searched for related issues and found none that matched my issue.
- I have read the FAQ and my problem is not listed.
Playground Link
Repro Code
function example<T>(
arg: T,
map: (item: T) => any = item => item ?? ''
) {}
example(null);ESLint Config
{
"rules": {
"@typescript-eslint/no-unnecessary-condition": "warn"
}
}tsconfig
Expected Result
No eslint errors.
Actual Result
Unnecessary conditional, expected left-hand side of ?? operator to be possibly null or undefined
Additional Info
Left-hand side of ?? operator can clearly be null as shown with the example(null) call.
Type hint for the example(null) call is the following:
function example<null>(arg: null, map?: (item: null) => any): void
{ "compilerOptions": { "strictNullChecks": true } }