If you want to contribute to TiddlyWiki's development, rather than installing TiddlyWiki in the usual way, you can work directly with the GitHub repository.
Mario Pietsch has created a short video introduction.
- Create an account on GitHub if you don't already have one
- Fork the TiddlyWiki5 GitHub repository from https://github.com/Jermolene/TiddlyWiki5
- Clone a local copy of your fork
- Open a command line terminal and change the current working directory to the root of the repo
npm link (Windows) or
sudo npm link (Mac/Linux) to tell npm to use this copy of the repo as the globally installed one
After this procedure you can work with TiddlyWiki5 via npm as though it were installed in the usual way with
npm install -g tiddlywiki.
See also Scripts for TiddlyWiki on Node.js.