Can a JavaScript object be created in TypeScript?

Looking for a way to utilize an existing JavaScript "class" within an Angular2 component written in TypeScript? The class is currently defined as follows:

function Person(name, age) {
    this.name = name;
    this.age = age;
}

Despite the fact that JavaScript doesn't have traditional classes before ES6, the challenge arises when attempting to instantiate this class in TypeScript:

var john = new Person('John Doe', 22);

Upon compiling the TypeScript code to JavaScript, the error message Cannot find name 'Person' is encountered as Person is not a recognized TypeScript class.

Are there any alternatives available to effectively utilize the existing JavaScript class within TypeScript without having to rewrite it entirely in TypeScript?

Answer №1

Perhaps you could attempt

let Person: any; // Enchantment
const john = new Person('John Doe', 22);

Answer №2

After trying Grzesiek's solution, I discovered I needed to make a slight modification.

My JavaScript object was nested within a couple of functions (for namespacing purposes) and was created using the following syntax:

new MyCorp.Utils.UsefulThing();

However, since I had to nest the declaration within a TypeScript namespace, I had to include 'export' in order for it to be accessible to the TypeScript code (which resided in a separate namespace). This resulted in the following modification:

namespace MyCorp.Utils {
    export declare var UsefulThing: any;
}

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