# yt-dlp-ejs > [!CAUTION] > This is currently in development External JavaScript for yt-dlp supporting many runtimes ## Manual Installation In the yt-dlp repository, install the python package, either directly or from url: ```console pip install git+https://github.com/yt-dlp/ejs@main ``` ## Development While this project does pin its dependencies, it does not use lockfiles or enforce a particular package manager. You may install dependencies using any compatible package manager. If you notice differences between different runtimes builds please open an issue [here](). ### Build To build the Python package you need a PEP518 compatible builder. The build hook will automatically invoke `deno`, `bun` or `node` as required. Alternatively, to only build the JavaScript files you can run the `bundle` script manually. ### Tests First, to download the player files, run `src/yt/solver/test/download.ts`. After running that once, use any of `deno test`, `bun test` or `node --test`. ## Licensing This code is licensed under [Unlicense](). An exception to this are the prebuilt wheels, which contain both [`meriyah`]() and [`astring`](), licensed under [`ISC`]() and [`MIT`](), respectively.