Takes a class like this:

export class HelloWorld extends HTMLElement {
  sayHi() {
    console.log('Hello, World');
  }
}

customElements.define('hello-world', HelloWorld)

And converts it to Python that looks like this:

"""HelloWorld Proxy."""

class HelloWorld(html.Element):
  def __init__(self):
    super(HelloWorld, self).__init__('hello-world')

  def say_hi(self):
    """sayHi method."""
    self._call('sayHi')

Notes:

1. The TypeScript compiler will resolve imports automatically, so any imported classes will also be exported as Python.
2. The HTMLElement name is derived from the class's name, such that capitalized letters are converted to hyphens, i.e. XFoo becomes x-foo. (Note that we ignore the first letter.) If a class has no capitalized letters beyond the first one, e.g. Foo, the derived name will be prepended with 'x-', i.e. 'x-foo'.

The tool requires Node.js 6+.

1. Clone the repo.
2. Install the TypeScript Compiler: npm install -g typescript.
3. Run npm install.
4. Compile: tsc --target es6 tswidgets.ts.
5. Run against the TypeScript code: node tswidgets.js /path/to/your/class.ts.
6. Python files will be written to the current working directory for any TypeScript classes found.