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no-corresponding-method-param

Id
@azure-tools/typespec-client-generator-core/no-corresponding-method-param

Severity: error

This diagnostic is issued when a required HTTP operation parameter cannot be mapped to any generated method parameter. The generated client would have no reliable way to supply that required service parameter.

Impact

Section titled “Impact”
  • Area: Method-to-protocol parameter mapping. Blocks generation of a service method when a required HTTP parameter cannot be supplied by the generated SDK method signature.
  • Not affected: The HTTP operation still declares the required parameter.

Diagnostic Message

Section titled “Diagnostic Message”

TCGC reports:

Missing HTTP operation parameter "apiVersion" in method "getWidget". Please check the method definition.

✅ How to Fix

Section titled “✅ How to Fix”

Check any client customization, such as @override, @paramAlias, parameter reordering, or parameter removal, that changes the method parameters, and fix it so every HTTP operation parameter still maps to a method parameter.