Ensure the temporary corruption of internal state goes unnoticed

Author: eps1lon

packages/react-server-dom-webpack/src/__tests__/ReactFlightDOMNode-test.js

@@ -809,6 +809,7 @@ describe('ReactFlightDOMNode', () => {
         resolvePendingPromise = value => {
           p2.status = 'fulfilled';
           p2.value = value;
+          resolve(value);
         };
       });
       const p3 = new Promise(() => {});
@@ -888,11 +889,11 @@ describe('ReactFlightDOMNode', () => {
       },
     );
 
+    resolvePendingPromise('custom-instrum-resolve');
     await serverAct(
       async () =>
         new Promise(resolve => {
           setImmediate(() => {
-            resolvePendingPromise();
             clientAbortController.abort();
             resolve();
           });
@@ -908,7 +909,7 @@ describe('ReactFlightDOMNode', () => {
       expect(normalizeCodeLocInfo(componentStack)).toBe(
         '\n' +
           '    in SharedComponent (at **)\n' +
-          '    in ServerComponent\n' +
+          '    in ServerComponent (at **)\n' +
           '    in Suspense\n' +
           '    in body\n' +
           '    in html\n' +
@@ -932,8 +933,8 @@ describe('ReactFlightDOMNode', () => {
           // The concrete location may change as this test is updated.
           // Just make sure they still point at React.use(p2)
           '\n    at SharedComponent (./ReactFlightDOMNode-test.js:794:7)' +
-          '\n    at ServerComponent (file://./ReactFlightDOMNode-test.js:815:26)' +
-          '\n    at App (file://./ReactFlightDOMNode-test.js:832:25)',
+          '\n    at ServerComponent (file://./ReactFlightDOMNode-test.js:816:26)' +
+          '\n    at App (file://./ReactFlightDOMNode-test.js:833:25)',
       );
     } else {
       expect(ownerStack).toBeNull();
@@ -1538,7 +1539,7 @@ describe('ReactFlightDOMNode', () => {
           '\n' +
             '    in body\n' +
             '    in html\n' +
-            '    in ClientRoot (ReactFlightDOMNode-test.js:1486:16)',
+            '    in ClientRoot (ReactFlightDOMNode-test.js:1487:16)',
         );
       }
 

packages/react-server/src/ReactFizzThenable.js

@@ -255,12 +255,19 @@ export function ensureSuspendableThenableStateDEV(
 ): () => void {
   if (__DEV__) {
     const lastThenable = thenableState[thenableState.length - 1];
+    // Reset the last thenable back to pending.
     switch (lastThenable.status) {
       case 'fulfilled':
         const previousThenableValue = lastThenable.value;
+        const previousThenableThen = lastThenable.then;
         delete lastThenable.value;
         delete (lastThenable: any).status;
+        // We'll call .then again if we resuspend. Since we potentially corrupted
+        // the internal state of unknown classes, we need to diffuse the potential
+        // crash by replacing the .then method with a noop.
+        lastThenable.then = noop;
         return () => {
+          lastThenable.then = previousThenableThen.bind(lastThenable);
           lastThenable.value = previousThenableValue;
           lastThenable.status = 'fulfilled';
         };