MapLibreParticleLab/metrics/integration/expression-tests/let/invalid-name/test.json

{
  "expression": ["let", "$a", 1, ["var", "$a"]],
  "inputs": [],
  "expected": {
    "compiled": {
      "result": "error",
      "errors": [
        {
          "key": "[1]",
          "error": "Variable names must contain only alphanumeric characters or '_'."
        }
      ]
    }
  }
}