fix: update terminology from "handler" to "resolver" in RouteHandlerRegistry and related tests

Author: arnabrahman

packages/event-handler/src/appsync-graphql/RouteHandlerRegistry.ts

@@ -30,7 +30,7 @@ class RouteHandlerRegistry {
   }
 
   /**
-   * Registers a new GraphQL route handler for a specific type and field.
+   * Registers a new GraphQL route resolver for a specific type and field.
    *
    * @param options - The options for registering the route handler, including the GraphQL type name, field name, and the handler function.
    * @param options.fieldName - The field name of the GraphQL type to be registered
@@ -46,7 +46,7 @@ class RouteHandlerRegistry {
     const cacheKey = this.#makeKey(typeName, fieldName);
     if (this.resolvers.has(cacheKey)) {
       this.#logger.warn(
-        `A route handler for field '${fieldName}' is already registered for '${typeName}'. The previous handler will be replaced.`
+        `A resolver for field '${fieldName}' is already registered for '${typeName}'. The previous resolver will be replaced.`
       );
     }
     this.resolvers.set(cacheKey, {

packages/event-handler/tests/unit/appsync-graphql/RouteHandlerRegistry.test.ts

@@ -34,7 +34,7 @@ describe('Class: RouteHandlerRegistry', () => {
     }
   );
 
-  it('logs a warning and replaces the previous handler if the field & type is already registered', () => {
+  it('logs a warning and replaces the previous resolver if the field & type is already registered', () => {
     // Prepare
     const registry = getRegistry();
     const originalHandler = vi.fn();
@@ -60,11 +60,11 @@ describe('Class: RouteHandlerRegistry', () => {
       handler: otherHandler,
     });
     expect(console.warn).toHaveBeenCalledWith(
-      "A route handler for field 'getPost' is already registered for 'Query'. The previous handler will be replaced."
+      "A resolver for field 'getPost' is already registered for 'Query'. The previous resolver will be replaced."
     );
   });
 
-  it('will not replace the handler if the event type is different', () => {
+  it('will not replace the resolver if the event type is different', () => {
     // Prepare
     const registry = getRegistry();
     const originalHandler = vi.fn();