vercel/ai · error · Error

Unsupported role: ${_exhaustiveCheck}

Error message

Unsupported role: ${_exhaustiveCheck}

What it means

Error "Unsupported role: ${_exhaustiveCheck}" thrown in vercel/ai.

Source

Thrown at packages/groq/src/convert-to-groq-chat-messages.ts:157

            case 'content':
            case 'json':
            case 'error-json':
              contentValue = JSON.stringify(output.value);
              break;
          }

          messages.push({
            role: 'tool',
            tool_call_id: toolResponse.toolCallId,
            content: contentValue,
          });
        }
        break;
      }

      default: {
        const _exhaustiveCheck: never = role;
        throw new Error(`Unsupported role: ${_exhaustiveCheck}`);
      }
    }
  }

  return messages;
}

View on GitHub (pinned to 69428b1f8b)

When it happens

Trigger: Thrown at packages/groq/src/convert-to-groq-chat-messages.ts:157 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of vercel/ai@69428b1f8b (2026-08-30). Data as JSON: /api/errors/15a9b2070c4fe73c. Report an issue: GitHub.