ESLint is flagging an issue where the TypeScript type declaration is attempting to reference a type that

Currently, I am in the process of developing a builder that incorporates various types. The method I use to define the type is as follows:

export type BuilderInterface<T> = {
  [key in keyof T]: (arg: T[key]) => BuilderInterface<T>;
} & {
  build(): T;
}

However, when I run ESLint, it gives me a warning stating:

"BuilderInteface" was used before it was defined (no-use-before-define)
. This makes sense since each argument function must return a builder of the same kind.

I am now exploring different approaches to declaring this without violating the eslint rule. Should I consider directly ignoring the rule? What are the reasons for and against doing so?

Answer №1

ESLint might have a point, as technically the type hasn't been declared and is being used in a recursive manner. Dealing with recursive types can be quite tricky. Consider trying out TSLint to see if it provides a more favorable outcome since it has better insights into TypeScript.

The TypeScript team excels in handling recursive types, so it's definitely a valid type to use.

If needed, either disable the rule causing the issue or make an exception so you can move forward with your tasks smoothly!

Answer №2

One reason types, as opposed to interfaces, are not self-referentiable is because of their nature. To avoid self-referencing, it's recommended to decompose your type or consider using interfaces instead.

In practice, however, it seems that your type works fine for me without any issues (without tslint, just ts). It appears that newer versions of TypeScript handle this case well. You can refer to this link for more information: https://github.com/Microsoft/TypeScript/issues/3496#issuecomment-128553540

Also, I noticed that you mentioned JSLint, not TSLint. It's important to note that JSLint may not be the best tool for checking TypeScript code. You might want to give TSLint a try instead.

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