Generate ES6 prototypes using TypeScript

Is it possible to enhance specific class methods in TypeScript by making them prototypes, even when the target is ES6?

Additionally, can a specific class be configured to only produce prototypes?

Consider the following TypeScript class:

class Test {
    constructor() {    
    }

    methodName() {   
    }
}

When targeting ES6, the resulting JavaScript code remains the same. However, I aim for:

class Test {
    constructor() {
    }
}

Test.prototype.methodName = function () {
}

Whether it's for a single method or all methods within the class, the goal is to generate prototypes despite utilizing ES6 as the primary target.


The inquiry arises from the necessity of creating numerous class instances within a module, with the understanding that prototypes may offer better performance in this scenario, as discussed in these posts:

  • Javascript prototype operator performance
  • Defining methods via prototype vs using this in the constructor

P.S. This inquiry mainly pertains to server-side applications, particularly Node.js versions 4-8.

Answer №1

When the following code is run:

class Test {
    constructor() {    
    }

    methodName() {   
    }
}

In an environment supporting ES6, the methodName function is defined on the prototype:

console.log(typeof Test.prototype.methodName)
VM153:1 function

UPDATE:

I conducted a basic test to compare the performance of a method defined within a class versus one assigned to the prototype. According to the findings on jsperf, calling the class method is 5% slower in Chrome 58, while using the prototype is 14% slower in Firefox.

I recommend conducting additional performance tests with actual data from your specific use cases, and then submitting any relevant feedback or bug reports to the Chrome and/or Firefox development teams.

Answer №2

Unfortunately, there isn't a direct method to achieve this (confirmed by a member of the TypeScript team).

It may be worth considering the reasoning behind your desire to accomplish this task. As far as I know, the differences between these two approaches are practically negligible in terms of functionality.

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