installation of v4 not working with yarn

[Marcel]

Hi MathJax developers,

Thanks for your constant work and improvement on this awesome software.

I'm currently using version 3.2.2 and my first attempt to migrate to version 4 failed already during installation with yarn: yarn add mathjax-full@4.0.0-beta.3 (I don't have npm installed and using pnpm might also not work).

A quick look into package.json shows that you added a custom install script (npm run -s link:full) that relies on npm.
Looking a bit further into the script, it adds the symlink node_modules/mathjax-full to the source code folder if there is the node_modules folder. This seems to be necessary only during development with source code from git but not if I want to load mathjax-full from a package repository because in this case the package will be install anyways into the node_modules/mathjax-full folder.

Would it be possible to remove the custom install script and then call npm run -s link:full in your dev environment? I see that .travis.yml is also using npm install. In that case a call to npm run -s link:full after the default install should work too.

Kind regards,
Marcel

[Davide P. Cervone]

I've merged your PR to resolve this.