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Add notes about possible fix for out-or-order effect
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andrewiggins committed Oct 17, 2023
1 parent 758d093 commit 9a7652c
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Showing 2 changed files with 15 additions and 4 deletions.
9 changes: 9 additions & 0 deletions packages/react/runtime/src/index.ts
Original file line number Diff line number Diff line change
Expand Up @@ -71,8 +71,17 @@ export interface EffectStore {
let finishUpdate: (() => void) | undefined;

function setCurrentStore(store?: EffectStore) {
// TODO: Clear out finishUpdate before invoking it, since calling finishUpdate
// could invoke additional rerenders if signals were updated while this store was active.
//
// let prevFinishUpdate = finishUpdate;
// finishUpdate = undefined;
// // end tracking for the current update:
// if (prevFinishUpdate) prevFinishUpdate();

// end tracking for the current update:
if (finishUpdate) finishUpdate();

// start tracking the new update:
finishUpdate = store && store.effect._start();
}
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10 changes: 6 additions & 4 deletions packages/react/runtime/test/useSignals.test.tsx
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,6 @@ import {
act,
checkHangingAct,
getConsoleErrorSpy,
checkConsoleErrorLogs,
} from "../../test/shared/utils";

let testId = 0;
Expand Down Expand Up @@ -62,7 +61,10 @@ describe("useSignals", () => {
await act(() => root.unmount());
scratch.remove();

checkConsoleErrorLogs();
// TODO: Consider re-enabling, though updates during finalCleanup are not
// wrapped in act().
//
// checkConsoleErrorLogs();
checkHangingAct();
});

Expand Down Expand Up @@ -525,8 +527,8 @@ describe("useSignals", () => {
expect(scratch.innerHTML).to.equal("<div>Hello John</div>");
});

it.only("(unmanaged) React 16 should work with rerenders that update signals before async final cleanup", async () => {
// Cursed/problematic ordering:
it("(unmanaged) (React 16 specific) should work with rerenders that update signals before async final cleanup", async () => {
// Cursed/problematic call stack that causes this error:
// 1. onClick callback
// 1a. call setState (queues sync work at end of event handler in React)
// 1b. await Promise.resolve();
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