fix(resolvers): stop calling Object.assign with boolean arguments

Author: MichalLytek

CHANGELOG.md

@@ -6,6 +6,7 @@
 - update `@types/graphql` to latest version (`^0.13.3`)
 ### Fixes
 - fix throwing error when `of => objectType` wasn't provided in abstract resolver class
+- fix calling `Object.assign` with boolean arguments (#111)
 
 ## v0.12.2
 ### Features

src/resolvers/validate-arg.ts

@@ -12,7 +12,11 @@ export async function validateArg<T extends Object>(
     return arg;
   }
 
-  const validatorOptions: ValidatorOptions = Object.assign({}, globalValidate, argValidate);
+  const validatorOptions: ValidatorOptions = Object.assign(
+    {},
+    typeof globalValidate === "object" ? globalValidate : {},
+    typeof argValidate === "object" ? argValidate : {},
+  );
   if (validatorOptions.skipMissingProperties !== false) {
     validatorOptions.skipMissingProperties = true;
   }