How to add an additional dependency via yarn.config.js

[MikeMitterer]

yarn constraint with it's config 'yarn.config.js' is really cool, but I couldn't find a way to add a devDependency when a certain condition is met.

    for (const dep of Yarn.dependencies({ ident: 'ts-node' })) {
      dep.update(`10.9.1`)
      // ts-node needs @types/node - how can I add this dependency??
    }

Any ideas?