fix prisma example not working

Author: SpaceK33z

packages/graphql-authentication-prisma/example/index.ts

@@ -39,7 +39,7 @@ const server = new GraphQLServer({
       endpoint: 'http://localhost:4466',
       debug: true
     }),
-    graphqlUser: graphqlAuthenticationConfig({
+    graphqlAuthentication: graphqlAuthenticationConfig({
       adapter: new GraphqlAuthenticationPrismaAdapter(),
       secret: 'wherearemyshoes',
       mailer,

packages/graphql-authentication-prisma/example/schema.graphql

@@ -1,4 +1,4 @@
-# import Query.*, Mutation.* from "../schema.graphql"
+# import Query.*, Mutation.* from "../../../node_modules/graphql-authentication/schema.graphql"
 
 type Query {
   timeline: [Post!]!

packages/graphql-authentication-prisma/src/Prisma.ts

@@ -5,8 +5,8 @@ export class GraphqlAuthenticationPrismaAdapter
   implements GraphqlAuthenticationAdapter {
   prismaContextName = 'db';
 
-  constructor(options: { prismaContextName?: string }) {
-    if (options.prismaContextName) {
+  constructor(options: { prismaContextName?: string } = {}) {
+    if (options && options.prismaContextName) {
       this.prismaContextName = options.prismaContextName;
     }
   }

packages/graphql-authentication-prisma/tsconfig.json

@@ -1,3 +1,6 @@
 {
-  "extends": "../../tsconfig.json"
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "strictFunctionTypes": false
+  }
 }