throws error if publish is called withing calling init method

.changeset/giant-geese-rest.md

@@ -0,0 +1,5 @@
+---
+"graphql-eventbus": minor
+---
+
+The bus throws an error if publish is called without initializing.

packages/core/src/GraphQLEventbus.test.ts

@@ -100,6 +100,28 @@ test("Allow invalid topic publishing", async () => {
   });
 });
 
+test("Publishing fails if bus is not initialized", async () => {
+  const publishCb = jest.fn();
+  const bus = new GraphQLEventbus({
+    publisher: {
+      schema: pubSchema,
+      publish: async (d) => {
+        publishCb(d);
+      },
+      allowInvalidTopic: true,
+    },
+  });
+  await expect(() =>
+    bus.publish({
+      topic: "TestEvent",
+      payload: {
+        id: "123",
+        name: "name",
+      },
+    }),
+  ).rejects.toThrow();
+});
+
 test("valid events are consumed and hooks are called", async () => {
   const consumeCb = jest.fn();
   let cbRef!: DataCb;

packages/core/src/GraphQLEventbus.ts

@@ -247,6 +247,9 @@ export class GraphQLEventbus {
     payload: {};
     metadata?: Partial<GraphQLEventbusMetadata>;
   }) => {
+    if (!this.isInitialized) {
+      throw new Error("The eventbus must be initialized before publishing.");
+    }
     if (!this.publishValidator) {
       throw new Error("Publish config not added!");
     }