What this snippet does
Using abstract constructor signatures in mixins allows extending unimplemented base classes while adding concrete properties.
Expected output
1
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
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- Mixins losing type information of base classAdvanced Classes & OOP · advanced
- Typing a function that accepts an abstract classAdvanced Classes & OOP · advanced
- Directly instantiating an abstract constructor typeAdvanced Classes & OOP · advanced
- Returning the current class instance typeAdvanced Classes & OOP · advanced