Extend a common configuration

[filimon-danopoulos]

In monorepo scenarios it is common to have repeating task. For example running TSC in a design system mono repo. It would be beneficial to be able to extend a common configuration in such scenario.

I would like to suggest an extension API to either extend an entire configuration or single script.

To extend an entire config one could do:

{
  scripts: {
    build: 'wireit'
  },
  wireit: {
    extends: '../config/wireit.json'
  }
}

To extend individual scripts one would do:

{
  scripts: {
    build: 'wireit'
  },
  wireit: {
    build: {
      extends: '../config/wireit.json:build'
    }
  }
}

Note the use of :build similar to the syntax in dependencies.

Wireit would add the file as dependency and merge the configuration in such a way that the local config has precedence.

It was noted in Discord that the collision of extends at the top level of the wireit config have to be handled. I suggest a very simplistic approach where if extends is a string it is handled as an extension otherwise as a script.