Why is this an issue?

The TypeScript programming language supports generics, a programming construct for creating reusable components, that is, components that can work over various types rather than a single one. Sometimes, we need to limit this genericity to a specific set of types, typically when we know these types share common capabilities, e.g., a length property. To this end, the language provides the extends clause to describe type constraints on type parameters, whether for classes, interfaces, type aliases, or functions.

By default, a type parameter extends the any type. It is therefore redundant to explicitly extend from any and should be removed accordingly.

How to fix it

Fixing such an issue involves removing the redundant type constraint to any.

Code examples

Noncompliant code example

class C<T extends any> {
    // ...
}

Compliant solution

class C<T> {
    // ...
}

Resources

Documentation

• TypeScript Documentation - Generics
• TypeScript Documentation - Generic Constraints