This information is for people who are working on the development of TiddlyWiki5 itself, and isn't relevant for end users
Setting up npm
Installing TiddlyWiki5 with NPM downloads a snapshot release of TiddlyWiki5. To use a development copy of the TiddlyWiki5 repository instead of the copy installed by NPM, use this command within the root of the TiddlyWiki5 repo:
npm link
Bumping version numbers
As releases are made during development it is necessary to adjust the version number of the TiddlyWiki5 core. This is done with the npm version command. For example:
npm version 5.0.0-alpha.10
As described in #10 in this article by npm's author, when run from within a git repo this command will also commit the change and tag it