No documentation was found for object "SomeClass" or any path ending with that.

I'm trying to setup sphinx_js but I keep receiving this error:

~/test_sphinx_js$ sphinx-build  -b html docs/source/ docs/build/html/
Running Sphinx v4.4.0
building [mo]: targets for 0 po files that are out of date
building [html]: targets for 1 source files that are out of date
updating environment: [new config] 1 added, 0 changed, 0 removed
reading sources... [100%] index                                                                                                                                                                                    
Sphinx error:
No documentation was found for object "SomeClass" or any path ending with that.

this is my test project structure:

.
├── docs
│   ├── build
│   │   └── html
│   ├── make.bat
│   ├── Makefile
│   └── source
│       ├── conf.py
│       ├── index.rst
│       ├── _static
│       └── _templates
└── src
    └── SomeClass.js

and these are the relevant settings and code:

conf.py

[...]
extensions = ['sphinx_js']
js_source_path = '../../src'
primary_domain = 'js'
[...]

index.rst:

Welcome to SomeDocs's documentation!
====================================

.. toctree::
   :maxdepth: 2
   :caption: Contents:



Indices and tables
==================

* :ref:`genindex`
* :ref:`modindex`
* :ref:`search`

.. js:autoclass:: SomeClass

SomeClass.js:

/** Class representing something. */
export default class SomeClass {

    /**
     * Create class.
     * @param {string} name - The name of the object.
     * @param {string} type - The type of object.
     */
    constructor(name, type) {
        this.name = name;
        this.type = type;

    }
}

I must be missing something obvious but I can't wrap my head around it

Reproduce the reported sphinx-build command using docs/source/conf.py, docs/source/index.rst, and src/SomeClass.js, then trace how sphinx_js uses js_source_path and resolves the js:autoclass target. Done means determining why SomeClass is not found and documenting or fixing the behavior so this example builds successfully.