Fix jest config

Author: CatsMiaow

jest.config.js

@@ -60,7 +60,8 @@ module.exports = {
   // A set of global variables that need to be available in all test environments
   globals: {
     "ts-jest": {
-      "tsconfig": "tsconfig.json"
+      tsconfig: "tsconfig.json",
+      isolatedModules: true,
     }
   },
 

test/jest.e2e.transformer.js

@@ -5,5 +5,5 @@ const transformer = require('@nestjs/graphql/plugin');
 module.exports = {
   name: 'nestjs-graphql-transformer',
   version: 1,
-  factory: (cs) => transformer.before({}, cs.tsCompiler.program)
+  factory: (tsCompiler) => transformer.before({}, tsCompiler.program)
 };