chore: publish 5.2.1 release

.gitignore

@@ -14,6 +14,7 @@ npm-debug.log
 /test
 /coverage
 /.nyc_output
+test-schema.graphql
 
 # dist
 /dist

lib/services/scalars-explorer.service.ts

@@ -26,19 +26,26 @@ export class ScalarsExplorerService extends BaseExplorerService {
     return this.flatMap<any>(modules, instance => this.filterScalar(instance));
   }
 
-  filterScalar(instance: Object) {
+  filterScalar<T extends any = any>(instance: T) {
     if (!instance) {
       return undefined;
     }
-    const customScalarName = Reflect.getMetadata(
+    const name = Reflect.getMetadata(
       SCALAR_NAME_METADATA,
       instance.constructor,
     );
-    return customScalarName
+    const bindContext = (fn: Function | undefined) =>
+      fn ? fn.bind(instance) : undefined;
+
+    return name
       ? {
-          [customScalarName]: new GraphQLScalarType(
-            Object.assign<any, any>(instance, { name: customScalarName }),
-          ),
+          [name]: new GraphQLScalarType({
+            name,
+            description: instance['description'],
+            parseValue: bindContext(instance.parseValue),
+            serialize: bindContext(instance.serialize),
+            parseLiteral: bindContext(instance.parseLiteral),
+          }),
         }
       : undefined;
   }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@nestjs/graphql",
-  "version": "5.2.0",
+  "version": "5.2.1",
   "description":
     "Nest - modern, fast, powerful node.js web framework (@graphql)",
   "author": "Kamil Mysliwiec",