incomplete between parameter type annotation and default value, but no error is reported.

[frokaikan]

Acknowledgement

• I acknowledge that issues using this template may be closed without further explanation at the maintainer's discretion.

Comment

code:

interface I { }
class J { }
function X(arg1: number, arg2?: number, arg3: J = new J(), arg4?: I): number | null { return null; }
(arg1: number, arg2?: number, arg3: J = 11.33, arg4?: I): number | null => { return null; }

the arg3 in the lambda expression has type J, but its default value is a number. However, typescript engine gives no error.

The version of tsc is 5.8.3

[MartinJohns]

Please use the bug report issue template for bug reports, or the feature request issue template for feature requests.

---

This is working as intended and mentioned in the FAQ:

• Why are all types assignable to empty interfaces?
  
• Why do these empty classes behave strangely?

[typescript-bot]

This issue has been marked as "Working as Intended" and has seen no recent activity. It has been automatically closed for house-keeping purposes.