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no-unknown

Full name
@azure-tools/typespec-azure-core/no-unknown

Azure services must not have properties of type unknown. All properties should have well-defined types to ensure proper serialization and client SDK generation.

❌ Incorrect

Section titled “❌ Incorrect”
model Widget {
  name: unknown;
}

✅ Correct

Section titled “✅ Correct”

Use a specific type:

model Widget {
  name: string;
}

Or use Record<string> for arbitrary key-value data:

model Widget {
  metadata: Record<string>;
}