fix: reverts conditional change within getPayload() that broke comp…

…atibility with fastify/middie middleware library

src/middleware/node/get-payload.ts

@@ -12,7 +12,7 @@ import AggregateError from "aggregate-error";
 type IncomingMessage = any;
 
 export function getPayload(request: IncomingMessage): Promise<string> {
-  if ("body" in request) {
+  if (request.body) {
     if (
       typeof request.body === "object" &&
       "rawBody" in request &&

test/integration/get-payload.test.ts

@@ -74,4 +74,19 @@ describe("getPayload", () => {
 
     expect(await promise).toEqual("foo");
   });
+
+  it("resolves with a string if the body key of the request is defined but value is undefined", async () => {
+    const request = new EventEmitter();
+    // @ts-ignore body is not part of EventEmitter, which we are using
+    // to mock the request object
+    request.body = undefined;
+
+    const promise = getPayload(request);
+
+    // we emit data, to ensure that the body attribute is preferred
+    request.emit("data", "bar");
+    request.emit("end");
+
+    expect(await promise).toEqual("bar");
+  });
 });