fix: enhance type parameters for resolver handlers and route options

Author: arnabrahman

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

@@ -140,11 +140,11 @@ class Router {
   ): MethodDecorator | undefined {
     if (typeof handler === 'function') {
       const resolverOptions = options as GraphQlRouteOptions;
-      const typeName = resolverOptions.typeName ?? 'Query';
+      const { typeName = 'Query', fieldName } = resolverOptions;
 
       this.resolverRegistry.register({
-        fieldName: resolverOptions.fieldName,
-        handler: handler as ResolverHandler<Record<string, unknown>>,
+        fieldName,
+        handler: handler as ResolverHandler,
         typeName,
       });
 
@@ -153,10 +153,10 @@ class Router {
 
     const resolverOptions = handler;
     return (_target, _propertyKey, descriptor: PropertyDescriptor) => {
-      const typeName = resolverOptions.typeName ?? 'Query';
+      const { typeName = 'Query', fieldName } = resolverOptions;
 
       this.resolverRegistry.register({
-        fieldName: resolverOptions.fieldName,
+        fieldName,
         handler: descriptor.value,
         typeName,
       });

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

@@ -3,15 +3,15 @@ import type { GenericLogger } from './common.js';
 
 // #region Resolver fn
 
-type ResolverSyncHandlerFn<TParams extends Record<string, unknown>> = (
+type ResolverSyncHandlerFn<TParams = Record<string, unknown>> = (
   args: TParams
 ) => unknown;
 
-type ResolverHandlerFn<TParams extends Record<string, unknown>> = (
+type ResolverHandlerFn<TParams = Record<string, unknown>> = (
   args: TParams
 ) => Promise<unknown>;
 
-type ResolverHandler<TParams extends Record<string, unknown>> =
+type ResolverHandler<TParams = Record<string, unknown>> =
   | ResolverSyncHandlerFn<TParams>
   | ResolverHandlerFn<TParams>;
 
@@ -36,11 +36,11 @@ type RouteHandlerRegistryOptions = {
  * @property fieldName - The name of the field to be registered
  * @property typeName - The name of the type to be registered
  */
-type RouteHandlerOptions = {
+type RouteHandlerOptions<TParams = Record<string, unknown>> = {
   /**
    * The handler function to be called when the event is received
    */
-  handler: ResolverHandler<Record<string, unknown>>;
+  handler: ResolverHandler<TParams>;
   /**
    * The field name of the event to be registered
    */