How do you manage class variables in ES6 classes when they are not natively supported?

Class Variable Alternatives in ES6

In ES5, developers often used a comfortable pattern to create classes and class variables, as demonstrated in the following code:

// ES 5
FrameWork.Class({

    variable: 'string',
    variable2: true,

    init: function(){

    },

    addItem: function(){

    }

});

However, in ES6, creating classes natively doesn't include the option to have class variables, as shown below:

// ES6
class MyClass {
    const MY_CONST = 'string'; // <p>This is because ES6 classes are restricted to containing methods. While it's possible to set this.myVar in the constructor, it's undesirable to clutter the constructor, especially with large classes.</p><p>Several approaches have been considered to address this issue, including:</p>

• Creating a ClassConfig handler: Pass a parameter object to the handler, which is declared separately from the class. The handler would then attach to the class. WeakMaps could potentially be integrated for this purpose.
• A stage 3 proposal: This proposal allows declaring variables within a class declaration/expression body using the syntax varName = value. It's expected to become obsolete in the future.
• Setting constructor variables: While not a perfect solution, constructor(){ this.foo = bar } can be used to set instance variables.
• ES7 property initializers: A new proposal for ES7 allows declaring more concise instance variables using class declarations and expressions.

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