Watch some scripts (e.g. build) but not others (e.g. serve)

[bennypowers]

I've got a use case which I'll bet is quite common:

• a build process that outputs files, in my case style-dictionary
• a dev server with it's own file watcher, watching the files output in the previous step, in my case @web/dev-server

It wouldn't make sense to restart the dev server on changes, so using it's built-in filewatcher is smart.
We'd also like to be able to watch the build's input files for changes and restart the build whenever sources change

"scripts": {
  "build": "wireit",
  "serve": "wireit",
  "start": "wireit"
},
"wireit": {
  "build": {
    "command": "style-dictionary build -c config.cjs",
    "files": [
      "tokens/**/*",
      "docs/**/*",
      "config.js"
    ],
    "output": [
      "build/**"
    ]
  },
  "serve": {
    "command": "wds --open --watch --root-dir build",
    "dependencies": [
      "build"
    ]
  },
  "start": {
    "???": "???"
  }
}

I want npm run build to run the build once, and I want npm run start to run the build command, then the dev server, then watch changes to the build command's inputs and rerun the build command when they change. I tried a few combinations of options but was unable to achieve that workflow with wireit.

I'd like to be able to define commands which are just combinations other commands, and I'd like to specify watchers in the config file, i.e. not with the watch command argument, but with some "watch": ["build"] in package.json

[rictic]

Related: #33

[aomarks]

Yeah this is #33 plus #237

[aomarks]

Closing as I believe service mode (#33) plus a "soft" dependency (#237 but exact naming/config still TBD) will solve this use-case.