What this snippet does
If generic constraints are too loose, the mixin might not preserve the base class methods; proper constraints are required for full typing.
Expected output
Compile Error: Property 'baseMethod' does not exist on type 'Mixed'.
Why practise typing this
Typing advanced classes & oop code builds muscle memory for the symbols and indentation TypeScript uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More TypeScript practice
- Basic mixin application via intersectionAdvanced Classes & OOP · advanced
- Adding a log method via mixinAdvanced Classes & OOP · advanced
- Typing a function that accepts an abstract classAdvanced Classes & OOP · advanced
- Mixin factory accepting abstract base classesAdvanced Classes & OOP · advanced
- Directly instantiating an abstract constructor typeAdvanced Classes & OOP · advanced
- Returning the current class instance typeAdvanced Classes & OOP · advanced