Can you identify the specific syntax for a 'set' function in TypeScript?

I have a TypeScript function that looks like this:

set parameter(value: string) {
  this._paremeter = value;
}

It works perfectly fine. For the sake of completeness, I tried to add a type that specifies this function does not return anything. I experimented with different types but none seem to work:

set parameter(vale: string): void {}
set parameter(vale: string): never {}

I also tested these just to be thorough, but unsurprisingly, they didn't work either:

set parameter(vale: string): undefined {}
set parameter(vale: string): null {}

Is there a correct type for this or should a set function simply have no type at all?

Answer №2

Extracted from the Typescript documentation

Typescript provides support for getters/setters which allow for controlling accesses to object members. This feature enables a more specific control over how each object member is accessed.

Here is an example showcasing a set method:

set fullName(newName: string) {
        if (newName && newName.length > fullNameMaxLength) {
            throw new Error("fullName has a max length of " + fullNameMaxLength);
        }

        this._fullName = newName;
    }

To sum up, a set method does not return a type, hence the first approach mentioned is the correct one.

set parameter(value: string) {
  this._paremeter = value;
}

Answer №3

In Typescript language, it is not allowed to specify a return type for a 'set' accessor.

Enabling tslint may trigger error ts(1095) in this scenario.

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