$extends bug

[drwpow]

Versions

@alpha

Node.js version

24

OS + version

26.3

Description

From Discord:

Are extends only valid if I also overwrite values? Or can they operate in isolation?

I've got my new T1 tokens with lightBlue 100-900:

{
  "color": {
    "lightBlue": {
      "100": {
        "$value": {
          "colorSpace": "hsl",
          "components": [193, 82, 89],
          "alpha": 1
        },
        "$description": "#ccf0fa"
      }
    }
  }
}

We're mapping legacy naming to this to avoid breaking changes while we go through deprecation, so I tried extending all the sub-values, just under the old name, but it just, doesn't render this out to CSS:

{
  "color": {
    "$type": "color",
    "light-blue": {
      "$extends": "{forge.color.lightBlue}",
      "$deprecated": "Use forge.color.lightBlue.*",
      "$description": "Deprecated"
    }
  }
}

Reproduction

(see previous)

Expected result

No bug

Extra

• I’m willing to open a PR (see CONTRIBUTING.md)