What is the process for converting this example into a TypeScript class?

Currently in the process of developing an application using the H5P plug-in, I came across the need to create something for the H5P editor. This led me to discover this documentation on implementing a widget.

/**
 * Module for Color selector widget
 *
 * @param {H5P.jQuery} $
 */
H5PEditor.widgets.colorSelector = H5PEditor.ColorSelector = (function ($) {
 
  /**
   * Initializes color selector.
   *
   * @class H5PEditor.ColorSelector
   *
   * @param {Object} parent
   * @param {Object} field
   * @param {string} params
   * @param {H5PEditor.SetParameters} setValue
   */
  function C(parent, field, params, setValue) {
    this.parent = parent;
    this.field = field;
    this.params = params;
    this.setValue = setValue;
  }
   
  /**
   * Adds the field to the wrapper.
   *
   * @param {H5P.jQuery} $wrapper
   */
  C.prototype.appendTo = function ($wrapper) {};
 
  /**
   * Validate the current values.
   *
   * @returns {boolean}
   */
  C.prototype.validate = function () {};
 
  /**
   * Remove the current field
   */
  C.prototype.remove = function () {};
 
  return C;
})(H5P.jQuery);

Since I intend to utilize other classes already coded in TypeScript, maintaining consistency is crucial regarding my programming language choices. The structure involving two identical classes with the same content at the beginning and end of the code is puzzling; it's an unfamiliar concept to me.

I would greatly appreciate any guidance on correctly translating this example into TypeScript. Suggestions on naming conventions for this construction are also welcome.

Thank you in advance!

Answer №1

The code you're looking at is an example of a self-invoking function, also known as an immediately invoked function. It runs right away without polluting the global namespace, which helps keep things tidy. At the end of the function, it grabs jQuery from the global namespace so it can be used inside the function.

In this case, the function is being used to populate the global H5PEditor object with the editor widget (similar to a class, but not exactly) for later use. The function returns the reference to C, which is then assigned to those two properties you noticed. Essentially, this is similar to how you would define a constructor function using the more modern class syntax.

It's possible that having two references to the function (or class) isn't strictly necessary for H5P, but I could be mistaken about that detail.

If you're working with TypeScript, it's likely you've set up a build process using tools like Babel. In that case, checking out https://github.com/otacke/h5p-editor-boilerplate could be helpful. It's essentially a similar setup to what you see in the code snippet above, but utilizing the class syntax and including webpack/npm build tools that make it easy to integrate TypeScript.

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