Using Typescript to replicate Object.defineProperties

Question

Using Typescript to replicate Object.defineProperties

Is there a way to emulate Object.defineProperties from JavaScript in Typescript? I am interested in achieving something similar using the syntax of Typescript:

Object.defineProperties(someObject.prototype,
   {
       property: {get: function() { return value; } },
       anotherProperty {get: function() { return somethingElse; } }
   });

Any advice or guidance on how to accomplish this? Thank you!

javascript typescript

Answer 1

Answer №1

To simplify your code, all you really need are getters (setters function in a similar way).

You can test this on the TS Playground page.

Here is a straightforward example:

class MyClass {
    private _myProp: string = "myPropValue";
    get myProp(): string {
        alert("get myProp: " + this._myProp);

        return this._myProp;
    }
    set myProp(value: string) {
        alert("set myProp: " + value);

        this._myProp = value;
    }
}

const myObj = new MyClass();
const myPropValue = myObj.myProp;
myObj.myProp = "newValue";
const myPropNewValue = myObj.myProp;

For more details, refer to the TS Handbook.

Answer 2

To simplify your code, all you really need are getters (setters function in a similar way).

You can test this on the TS Playground page.

Here is a straightforward example:

class MyClass {
    private _myProp: string = "myPropValue";
    get myProp(): string {
        alert("get myProp: " + this._myProp);

        return this._myProp;
    }
    set myProp(value: string) {
        alert("set myProp: " + value);

        this._myProp = value;
    }
}

const myObj = new MyClass();
const myPropValue = myObj.myProp;
myObj.myProp = "newValue";
const myPropNewValue = myObj.myProp;

For more details, refer to the TS Handbook.

Answer 3

Answer №2

To maintain your code logic, there is no need for alterations other than informing typescript about the object's structure through DefineProperties functions.

Begin by crafting an interface for the desired object. The getters can be treated as standard readonly properties within this interface.

Subsequently, establish a temporary variable of type [insert type here] and assign all properties/getters to it.

Lastly, create a new typed variable that points to the previously configured object containing all getters: const getterObject = tempGetterObj

Answer 4

To maintain your code logic, there is no need for alterations other than informing typescript about the object's structure through DefineProperties functions.

Begin by crafting an interface for the desired object. The getters can be treated as standard readonly properties within this interface.

Subsequently, establish a temporary variable of type [insert type here] and assign all properties/getters to it.

Lastly, create a new typed variable that points to the previously configured object containing all getters: const getterObject = tempGetterObj

Using Typescript to replicate Object.defineProperties

Answer №1

Answer №2

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