diff --git a/package-lock.json b/package-lock.json
index a1741e5..3aa0ad5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,70 +1,367 @@
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+            "version": "16.8.0",
+            "resolved": "https://registry.npmjs.org/graphql/-/graphql-16.8.0.tgz",
+            "integrity": "sha512-0oKGaR+y3qcS5mCu1vb7KG+a89vjn06C7Ihq/dDl3jA+A8B3TKomvi3CiEcVLJQGalbu8F52LxkOym7U5sSfbg=="
+        },
+        "make-error": {
+            "version": "1.3.6",
+            "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
+            "integrity": "sha512-s8UhlNe7vPKomQhC1qFelMokr/Sc3AgNbso3n74mVPA5LTZwkB9NlXf4XPamLxJE8h0gh73rM94xvwRT2CVInw==",
+            "dev": true
+        },
         "ts-node": {
-            "version": "8.0.2",
-            "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-8.0.2.tgz",
-            "integrity": "sha512-MosTrinKmaAcWgO8tqMjMJB22h+sp3Rd1i4fdoWY4mhBDekOwIAKI/bzmRi7IcbCmjquccYg2gcF6NBkLgr0Tw==",
+            "version": "10.9.1",
+            "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.1.tgz",
+            "integrity": "sha512-NtVysVPkxxrwFGUUxGYhfux8k78pQB3JqYBXlLRZgdGUqTO5wU/UyHop5p70iEbGhB7q5KmiZiU0Y3KlJrScEw==",
             "dev": true,
             "requires": {
+                "@cspotcode/source-map-support": "^0.8.0",
+                "@tsconfig/node10": "^1.0.7",
+                "@tsconfig/node12": "^1.0.7",
+                "@tsconfig/node14": "^1.0.0",
+                "@tsconfig/node16": "^1.0.2",
+                "acorn": "^8.4.1",
+                "acorn-walk": "^8.1.1",
                 "arg": "^4.1.0",
-                "diff": "^3.1.0",
+                "create-require": "^1.1.0",
+                "diff": "^4.0.1",
                 "make-error": "^1.1.1",
-                "source-map-support": "^0.5.6",
-                "yn": "^3.0.0"
+                "v8-compile-cache-lib": "^3.0.1",
+                "yn": "3.1.1"
             }
         },
         "ts-type-ast": {
@@ -77,14 +374,20 @@
             }
         },
         "typescript": {
-            "version": "3.4.5",
-            "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.4.5.tgz",
-            "integrity": "sha512-YycBxUb49UUhdNMU5aJ7z5Ej2XGmaIBL0x34vZ82fn3hGvD+bgrMrVDpatgz2f7YxUMJxMkbWxJZeAvDxVe7Vw=="
+            "version": "5.2.2",
+            "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.2.2.tgz",
+            "integrity": "sha512-mI4WrpHsbCIcwT9cF4FZvr80QUeKvsUsUvKDoR+X/7XHQH98xYD8YHZg7ANtz2GtZt/CBq2QJ0thkGJMHfqc1w=="
+        },
+        "v8-compile-cache-lib": {
+            "version": "3.0.1",
+            "resolved": "https://registry.npmjs.org/v8-compile-cache-lib/-/v8-compile-cache-lib-3.0.1.tgz",
+            "integrity": "sha512-wa7YjyUGfNZngI/vtK0UHAN+lgDCxBPCylVXGp0zu59Fz5aiGtNXaq3DhIov063MorB+VfufLh3JlF2KdTK3xg==",
+            "dev": true
         },
         "yn": {
-            "version": "3.0.0",
-            "resolved": "https://registry.npmjs.org/yn/-/yn-3.0.0.tgz",
-            "integrity": "sha512-+Wo/p5VRfxUgBUGy2j/6KX2mj9AYJWOHuhMjMcbBFc3y54o9/4buK1ksBvuiK01C3kby8DH9lSmJdSxw+4G/2Q==",
+            "version": "3.1.1",
+            "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+            "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
             "dev": true
         }
     }
diff --git a/src/createSchema.ts b/src/createSchema.ts
index c0cb426..4849c44 100644
--- a/src/createSchema.ts
+++ b/src/createSchema.ts
@@ -18,6 +18,7 @@ import {
     GraphQLUnionType,
     GraphQLError,
     Kind,
+    ValueNode,
 } from 'graphql';
 import * as ts from 'typescript';
 import {DateType} from './date';
@@ -169,8 +170,8 @@ export function createSchema(
         if (!type.members.every(m => m.kind === 'primitive' && m.type === 'string'))
             throw new Error('Input union supports only string unions');
         const union = type.members.map(m => m.kind === 'primitive' && m.literal);
-        const validate = (val: string) => {
-            if (!union.includes(val))
+        const validate = (val: unknown) => {
+            if (typeof val !== "string" || !union.includes(val))
                 throw new GraphQLError(`Input union: "${union.join(' | ')}" doesn't have value: ${val}`);
             return val;
         };
@@ -179,11 +180,10 @@ export function createSchema(
             description: type.kind === 'union' ? type.doc : undefined,
             serialize: validate,
             parseValue: validate,
-            parseLiteral(ast) {
+            parseLiteral(ast: ValueNode) {
                 if (ast.kind === Kind.STRING) {
                     return validate(ast.value);
                 }
-                return null;
             },
         });
     }
diff --git a/src/date.ts b/src/date.ts
index bfe6fea..5bba30e 100644
--- a/src/date.ts
+++ b/src/date.ts
@@ -2,14 +2,20 @@ import {GraphQLScalarType, Kind, GraphQLError} from 'graphql';
 
 export const DateType = new GraphQLScalarType({
     name: 'Date',
-    serialize: date => {
-        if (Number.isNaN(date.getTime())) {
-            throw new Error('Invalid response date');
+    serialize: (date) => {
+        if (!(date instanceof Date)) {
+            throw new Error("Date object expected")
+        }
+        else {
+            if (Number.isNaN(date.getTime())) {
+                throw new Error('Invalid response date');
+            }
+            return date.toJSON();
         }
-        return date.toJSON();
     },
     parseValue: val => {
-        return parse(val);
+        if (typeof val === "string") return parse(val);
+        else throw new Error("String value expected.")
     },
     parseLiteral(ast) {
         if (ast.kind === Kind.STRING) {
diff --git a/tsconfig.json b/tsconfig.json
index 32f87af..b9857da 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,5 +6,8 @@
         "outDir": "dist",
         "declaration": true,
         "strict": true
-    }
+    },
+    "exclude": [
+      "node_modules",
+    ]
 }