avoid side-effect with MSW server in vulcan utils

jest/setupFilesAfterEnv.ts

@@ -4,14 +4,14 @@
 // @see https://github.com/testing-library/jest-dom
 import "@testing-library/jest-dom";
 
-import { mswServer } from "@vulcanjs/utils";
+import { getMswServer } from "@vulcanjs/utils";
 // MSW setup
 // TODO: storybook test might already initialize a worker (in preview.js),
 // not sure yet of the interaction between this worker and the server we create here
 // However, we still need a setup specific to Jest for non-storybook tests
 // Enable API mocking before tests.
-beforeAll(() => mswServer.listen());
+beforeAll(() => getMswServer().listen());
 // Reset any runtime request handlers we may add during the tests.
-afterEach(() => mswServer.resetHandlers());
+afterEach(() => getMswServer().resetHandlers());
 // Disable API mocking after the tests are done.
-afterAll(() => mswServer.close());
+afterAll(() => getMswServer().close());

packages/react-ui/components/form/tests/FormContainer.client.test.tsx

@@ -25,11 +25,11 @@ import {
 } from "@vulcanjs/graphql";
 import { OneFieldGraphql, OneFieldType } from "./fixtures/graphqlModels";
 
-import { mswServer } from "@vulcanjs/utils";
+import { getMswServer } from "@vulcanjs/utils";
 
 beforeEach(() => {
   // add relevant mocks
-  mswServer.use(...graphqlMutationStubsToMsw([createMock]));
+  getMswServer().use(...graphqlMutationStubsToMsw([createMock]));
 });
 const createMock: GraphqlMutationStub<any> = {
   operationName: createOperationName(OneFieldGraphql),

packages/utils/mswServer.ts

@@ -4,4 +4,18 @@
  * @see https://mswjs.io/docs/api/setup-server/use
  */
 import { setupServer } from "msw/node";
-export const mswServer = setupServer();
+
+let mswServer;
+/**
+ * Return a global instance of MSW server
+ * (initialize the server during first call)
+ *
+ * NOTE: keep this code within a function to avoid side effectr when loading the package
+ * @returns
+ */
+export const getMswServer = () => {
+  if (!mswServer) {
+    mswServer = setupServer();
+  }
+  return mswServer;
+};