Importing a Brython module that is implemented in pure JavaScript

I hope you had a wonderful Christmas 🎄 🎅 🤶 🎁

I have the special case that I have a Brython module in pure JavaScript and want to import it using the import statement without making it accessible via a script tag beforehand.

Thanks in advance.

[PierreQuentel]

I don’t think it’s a good idea to change the standard Brython import mechanism in py_import.js, because it would add the search for JS modules (hence an Ajax call) for all imports. At the moment, only the JS modules in the Brython stdlib, in folder libs, can be imported.

My idea was more to develop a specific loader, that would only be added to sys.meta_path for the (rare) case when a user-specific JS module, at a specific location, needs to be imported.

In issue #1182 I had provided an example of a loader written in Python, maybe you can start from this example for a Javascript module loader.

[PierreQuentel]

In commit 8e8d0a59edd925acabda4a09fccda6deff2334fb I have added a function import_js(url, name) in module javascript that makes it possible to import a module written in Javascript. This module must define a name $module, used to build the module namespace, with the usual Javascript -> Python conversions.

If Javascript script at js_test.js is

var $module = { x: 1 }

then a Python script can use it this way:

import javascript

javascript.import_js("js_test.js", "js_module") 
import js_module 
assert js_module.x == 1