make class only available to be used in other class in pure js in javascript

In JavaScript, you can create a module that encapsulates a class, thus making it only available to be used in other classes. This is achieved using the module pattern, which involves defining a self-invoking function that returns an object containing the class's properties and methods.

Here's an example implementation of this pattern:

index.tsx
let MyModule = (function() {
  // Private variables and functions
  let privateVar = 'This variable is private';

  function privateFunc() {
    console.log('This function is private');
  }

  // Class definition
  class MyClass {
    constructor(name) {
      this.name = name;
    }

    publicMethod() {
      console.log(`Hello, ${this.name}!`);
    }
  }

  // Return public properties
  return {
    myClass: MyClass
  };
})();

// Usage outside the module
let instance = new MyModule.myClass('John');
instance.publicMethod(); // Output: Hello, John!

// Usage inside the module
console.log(MyModule.privateVar); // Output: undefined
MyModule.privateFunc(); // Output: Uncaught TypeError: MyModule.privateFunc is not a function
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In this example, the module defines a private variable and function that can only be accessed within the module itself. It also defines a public class that can be accessed outside the module by returning it as a property of the module object.

By using this pattern, you can ensure that your class is only available to be used within other classes, thus promoting encapsulation and reducing coupling between different parts of your code.