When I create a function that returns a class, the structure looks like this:
function createClass() {
return class implements ISomeInterface {/* ... */}
}
export { createClass }
However, I am now encountering a warning from ESLint:
Missing return type on function.
ESLint is referring to this ESLint rule.
What should I do to define the return type of createClass in order to satisfy ESLint?
Provided is the interface that corresponds to the instance type of an anonymous class:
interface ISomeInterface {
prop: string;
method(): void;
}
In addition, it can be beneficial to define an interface corresponding to the constructor of the class. This interface would encompass any static properties of the constructor, along with the construct signature of the class, as demonstrated below:
interface SomeInterfaceConstructor {
new(prop: string): ISomeInterface;
}
The construct signature
new(prop: string): ISomeInterfacec of type SomeInterfaceConstructor, you can invoke new c("foobar"); to obtain an ISomeInterface instance. It's important to note that this syntax does not imply that SomeInterfaceConstructor has a method named "new", despite the appearance.
By assigning a name to the constructor's interface, you can simply have createClass() return that specified type:
function createClass(): SomeInterfaceConstructor {
return class implements ISomeInterface {
constructor(public prop: string) { }
method() {
console.log("My prop is " + this.prop);
}
}
}
Testing the functionality, you can observe that it functions as expected:
const c = createClass();
// const c: SomeInterfaceConstructor;
const i = new c("foobar");
// const i: ISomeInterface
i.method(); // My prop is foobar
export { createClass }
When exporting createClass(), it might be worthwhile to also export the SomeInterfaceConstructor type, as well as ISomeInterface if it's not already exported or defined elsewhere.
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