Attempting to extract the constructor parameter type from a class, but the class in question accepts a generic type value.
Does anyone know how to achieve this?
Encountered error:
ConstructorParameters<typeof(DictionaryClass<contentType>)[0];
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Operator '>' cannot be applied to types 'pathfinder_T' and 'number[]'.
To achieve this functionality, you can utilize conditional types in combination with the infer keyword:
class CustomClass<T> {
customProperty?: T;
}
class AnotherClass {
constructor(arg: CustomClass<string>) {
// Do something
}
}
type ExtractCustomType<P> = P extends CustomClass<infer T> ? T : never;
type customType = ExtractCustomType<ConstructorParameters<typeof AnotherClass>[0]>
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