chore: fix formatting and add changeset

Author: smilkuri

.changeset/stale-phones-behave.md

@@ -0,0 +1,5 @@
+---
+"@smithy/middleware-endpoint": minor
+---
+
+handle clientContextParam collisions with builtin config keys

packages/middleware-endpoint/src/adaptors/createConfigValueProvider.ts

@@ -21,10 +21,8 @@ export const createConfigValueProvider = <Config extends Record<string, unknown>
     // Check clientContextParams first for client context parameters
     const clientContextParams = config.clientContextParams as Record<string, unknown> | undefined;
     const nestedValue: unknown = clientContextParams?.[configKey] ?? clientContextParams?.[canonicalEndpointParamKey];
-    
-    // Fall back to direct config properties 
+    // Fall back to direct config properties
     const configValue: unknown = nestedValue ?? config[configKey] ?? config[canonicalEndpointParamKey];
-    
     if (typeof configValue === "function") {
       return configValue();
     }

packages/middleware-endpoint/src/adaptors/getEndpointFromInstructions.ts

@@ -78,13 +78,11 @@ export const resolveParams = async <
   instructionsSupplier: EndpointParameterInstructionsSupplier,
   clientConfig: Partial<EndpointResolvedConfig<T>> & Config
 ) => {
-  // Initialize clientContextParams to empty object if undefined 
-  // when accessing nested properties during parameter resolution
+  // Initialize clientContextParams to empty object if undefined
   const config = clientConfig as typeof clientConfig & { clientContextParams?: Record<string, unknown> };
   if (config.clientContextParams === undefined) {
     config.clientContextParams = {};
   }
-  
   const endpointParams: EndpointParameters = {};
   const instructions: EndpointParameterInstructions = instructionsSupplier?.getEndpointParameterInstructions?.() || {};