Tips for enforcing strict typing in TypeScript when implementing abstract functions

Consider the following scenario with two classes:

abstract class Configuration {
    abstract setName(name: string);
}

class MyConfiguration extends Configuration {
    setName(name) {
         // set name.
    }
}

In this setup, the name parameter in MyConfiguration is of type any. This raises a question about the purpose of typing abstract functions if their types do not propagate down to inheriting classes. Is there a way to enforce typing without directly modifying the MyConfiguration class? The goal is to create a configuration for a third-party tool without requiring end-users to manually type abstract function parameters, although it is recommended.

Any ideas or suggestions on how to achieve this?

Answer №1

Why bother typing abstract functions if the types are not passed down?

The purpose of typing abstract functions is to assist users who choose to use static type checking. In such cases, static type checking can help prevent bugs by alerting you to issues like this:

// compiler: Class 'MyConfig' incorrectly extends base class 'Config'.
class MyConfig extends Config {
    setName(name: number) {

    }
}

For users who do not utilize static type checking, it's true that the `name` parameter in `MyConfig` will default to type `any`, leading the compiler to overlook type discrepancies and making the typed abstraction function seem redundant.

It's impossible to mandate that all TypeScript users must adopt static type checking, as there's no way to restrict the utilization of `any`. This is intentional.

Recommendation: acknowledge that some users will opt for static type checking while others will not. Provide typings for those who prefer them.

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