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T1009: Unsupported DTCG feature ​

Cause ​

The file uses a DTCG feature Tessera does not support yet, such as group $extends or a JSON Pointer $ref. Unsupported features are reported instead of being ignored silently.

Example ​

text
// base.tokens.json
{
  "g": {
    "$extends": "{other}"
  }
}

What you see ​

text
ERROR  T1009  base.tokens.json  g
  Group "$extends" is not supported yet. Write the tokens out in the group instead.
  Run `tessera explain T1009` for details.

Fix ​

Write the tokens out in the group, or use a {group.token} alias.

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