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Dev environment​

Get the right Node version​

The .nvmrc contains the Node version we use in VN. Usually, higher up versions will also work, but may introduce unexpected breaking changes.

We recommend to install Node using NVM for Linux/Mac or NVM for Windows, especially if you need to maintain multiple projects.


We follow the Git Flow model.

  • devel: Devel is the next version. This is where you want to start for contribution.
  • main: is the current live version.
  • bugfix/*: Bugfixes branches should start from main.
  • feature/*: features branches should start from devel.
  • support/*x.x.x*: is for bugfixes for a specific version.
  • Tags allow to easily find the commit corresponding to a deployed versions.

Vulcan NPM local installation​

If you want to use the bleeding edge version of Vulcan, you'll need to install the Vulcan NPM packages locally. Vulcan NPM is relying on Lerna.

We rely on Yalc to set a local registry that simulates NPM behaviour. This palliates limitations of yarn link, which is simpler, but creates unexpected issues with duplicate node_modules (the symlinked package keeps using node_modules from the monorepo instead of your app, leading to duplicate React instance, wrong Webpack version...).

  • In Vulcan NPM, run yarn run publish:local. This will use yalc to simulate a local NPM registry (quite similarly to METEOR_PACKAGE_DIRS)
  • In Vulcan Next, run yarn run link:vulcan. This will symlink Vulcan packages to the local registry.

If you modify Vulcan NPM:

  • In Vulcan NPM, run yarn run build
  • Run yalc run publish:local again. Note: no need to "link" again, publish:local will use Yalc "push" option to automatically update your Vulcan Next install.


Issues with hooks due to multiple version of React​

This is an open issue with Yarn workspaces, it is difficult not to duplicate packages used both by your NPM packages and your local app. Easiest solution is to force Vulcan Next to use the packages from Vulcan NPM. See relevant scripts in both Vulcan NPM (to activate the link) and Vulcan Next (to use linked versions).

Deployment of Vulcan Next demo on Vercel​

Vercel only provide a free-tier for personnal accounts. Therefore, is based on eric-burel/vulcan-next fork instead of the main repo VulcanJS/vulcan-next.

wei/pull bot is used to automatically synchronize this fork with the main Vulcan Next repository. The application will be deployed automatically when Vulcan Next master branch is updated, but expect some latency because of this fork setup.