Utilizing TypeScript to export a class constructor as a named function

Imagine you have this custom class:

export class PerformActionClass<TEntity> {
    constructor(entity: TEntity) {
    }
}

You can use it in your code like this:

new PerformActionClass<Person>(myPersonObject);

However, you may want a more concise way of calling it:

PerformAction<Person>(myPersonObject);

This shorthand syntax is achievable with the following approach:

export function PerformAction<TEntity>(entity: TEntity): PerformActionClass<TEntity>{
    return new PerformActionClass<TEntity>(entity);
}

The desired goal is to export the constructor of the class as a separate, named function without duplication. One attempt was:

export PerformAction = PerformActionClass.prototype.constructor;

Unfortunately, this method did not work as expected. Is there a more efficient way to accomplish this task?

Answer №1

If you are wondering whether it is possible to achieve this, the answer is yes! You can accomplish it by utilizing a method similar to the one below:

export const DoSomething = DoSomethingClass.prototype.constructor;

By doing this, you will be able to circumvent any compilation errors that may arise.

On the other hand, consider this...

In my personal view, I would recommend steering clear of such a structure.

The crucial question here is what your specific intention is for implementing this approach. If your sole aim is to run the code within the constructor, then the aforementioned technique might suffice. Alternatively, exporting a function could present a more logical choice in such scenarios.

Typically, constructors are utilized when creating instances of a particular class. The common practice involves using the new operator.

Take a look at the following example, which highlights the difference between var1 and var2 in relation to the usage of the new keyword. While the sample code is written in JavaScript, TypeScript will also produce a comparable outcome post-compilation.

var myFunction = function(prop1) {
    this.prop1 = prop1;
    console.log("myFunction called. prop1:" + this.prop1);

    this.method1 = function() {
        console.log("Method1")
    }
}

var var1 = myFunction("called as normal func");
var var2 = new myFunction("called with new");

console.log(var1); //undefined
console.log(var2);

// var1.method1(); //error
var2.method1();

console.log(var2.__proto__ === myFunction.prototype); //true

This may not be the exact solution you were searching for, but I trust that it provides some clarity on the matter.

For further insights, you can explore these informative resources:

  1. https://basarat.gitbooks.io/typescript/content/docs/classes-emit.html
  2. https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/proto

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