goog-class-to-es6

googclass-to-es6class

Transform a google closure class defined using goog.defineClass into an es6 class

For example:

const Parent = goog.require('some.ns.Parent');
 
const FooBar = goog.defineClass(Parent, {
  /**
   * Creates a new instance of...
   * @param {Object} name 
   */
  constructor: function(name) {
    this.name = name;
  }
});
 
exports = FooBar;

Will be transformed into:

const Parent = goog.require('some.ns.Parent');
 
class FooBar extends Parent {
  /**
   * Creates a new instance of...
   * @param {Object} name 
   */
  constructor(name) {
    super(name);
 
    this.name = name;
  }
}
 
exports = FooBar;

How to use it

Install from npm

npm i goog-class-to-es6 -g

Transform a file

Provide the name of the file. The transformed class will be written to stdout:

goog-class-to-es6 some_goog_define_class.js

Do inline replacement. The file will be overwritten.

goog-class-to-es6 -i some_goog_define_class.js

Write to another file

goog-class-to-es6 some_goog_define_class.js output_file_es6.js

Testing

# 1. Clone this repo 
# 2. Install 
npm i
# 3. Test 
npm test

Changelog

• 1.4.0 Add empty line at the end of file if original file has it.
• 1.5.0 Skip files without goog.defineClass.
• 1.6.0 Add support for functions declared like: foo() {
• 1.7.0 Escape closure type casts because Babel strips them.