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Remove useSyncExternalStore in favor of useState #10377

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merged 4 commits into from
Apr 21, 2023
Merged

Remove useSyncExternalStore in favor of useState #10377

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7a5fb11
Remove useSyncExternalStore in favor of useState
brophdawg11 Apr 19, 2023
d234044
Drop bundle
brophdawg11 Apr 20, 2023
8c3431b
Merge branch 'dev' into brophdawg11/remove-uses
brophdawg11 Apr 21, 2023
f3fd217
Merge branch 'dev' into brophdawg11/remove-uses
brophdawg11 Apr 21, 2023
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6 changes: 6 additions & 0 deletions .changeset/remove-use-sync-external-store.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,6 @@
---
"react-router": patch
"react-router-dom": patch
---

Switched from `useSyncExternalStore` to `useState` for internal `@remix-run/router` router state syncing in `<RouterProvider>`. We found some [subtle bugs](https://codesandbox.io/s/use-sync-external-store-loop-9g7b81) where router state updates got propagated _before_ other normal `useState` updates, which could lead to footguns in `useEffect` calls.
4 changes: 2 additions & 2 deletions package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -108,10 +108,10 @@
"none": "45 kB"
},
"packages/react-router/dist/react-router.production.min.js": {
"none": "13.3 kB"
"none": "12.7 kB"
},
"packages/react-router/dist/umd/react-router.production.min.js": {
"none": "15.6 kB"
"none": "15.0 kB"
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As a bonus we drop the use-sync-external-store/shim and shave a few bytes

},
"packages/react-router-dom/dist/react-router-dom.production.min.js": {
"none": "11.8 kB"
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48 changes: 18 additions & 30 deletions packages/react-router-dom/__tests__/special-characters-test.tsx
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Expand Up @@ -828,19 +828,8 @@ describe("special character tests", () => {
});

describe("browser routers", () => {
let testWindow: Window;

beforeEach(() => {
// Need to use our own custom DOM in order to get a working history
const dom = new JSDOM(`<!DOCTYPE html><html><body></body></html>`, {
url: "https://remix.run/",
});
testWindow = dom.window as unknown as Window;
testWindow.history.pushState({}, "", "/");
});
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Reusing the same window instance across these tests was. ... not smart on my part :)


it("encodes characters in BrowserRouter", () => {
testWindow.history.replaceState(null, "", "/with space");
let testWindow = getWindow("/with space");

let ctx = render(
<BrowserRouter window={testWindow}>
Expand All @@ -857,7 +846,7 @@ describe("special character tests", () => {
});

it("encodes characters in BrowserRouter (navigate)", () => {
testWindow.history.replaceState(null, "", "/");
let testWindow = getWindow("/");

function Start() {
let navigate = useNavigate();
Expand All @@ -882,7 +871,7 @@ describe("special character tests", () => {
});

it("encodes characters in createBrowserRouter", () => {
testWindow.history.replaceState(null, "", "/with space");
let testWindow = getWindow("/with space");

let router = createBrowserRouter(
[{ path: "/with space", element: <ShowPath /> }],
Expand All @@ -897,7 +886,7 @@ describe("special character tests", () => {
});

it("encodes characters in createBrowserRouter (navigate)", () => {
testWindow.history.replaceState(null, "", "/with space");
let testWindow = getWindow("/");

function Start() {
let navigate = useNavigate();
Expand All @@ -923,19 +912,8 @@ describe("special character tests", () => {
});

describe("hash routers", () => {
let testWindow: Window;

beforeEach(() => {
// Need to use our own custom DOM in order to get a working history
const dom = new JSDOM(`<!DOCTYPE html><html><body></body></html>`, {
url: "https://remix.run/",
});
testWindow = dom.window as unknown as Window;
testWindow.history.pushState({}, "", "/");
});

it("encodes characters in HashRouter", () => {
testWindow.history.replaceState(null, "", "/#/with space");
let testWindow = getWindow("/#/with space");

let ctx = render(
<HashRouter window={testWindow}>
Expand All @@ -953,7 +931,7 @@ describe("special character tests", () => {
});

it("encodes characters in HashRouter (navigate)", () => {
testWindow.history.replaceState(null, "", "/");
let testWindow = getWindow("/");

function Start() {
let navigate = useNavigate();
Expand All @@ -979,7 +957,7 @@ describe("special character tests", () => {
});

it("encodes characters in createHashRouter", () => {
testWindow.history.replaceState(null, "", "/#/with space");
let testWindow = getWindow("/#/with space");

let router = createHashRouter(
[{ path: "/with space", element: <ShowPath /> }],
Expand All @@ -995,7 +973,7 @@ describe("special character tests", () => {
});

it("encodes characters in createHashRouter (navigate)", () => {
testWindow.history.replaceState(null, "", "/");
let testWindow = getWindow("/");

function Start() {
let navigate = useNavigate();
Expand All @@ -1022,3 +1000,13 @@ describe("special character tests", () => {
});
});
});

function getWindow(initialPath) {
// Need to use our own custom DOM in order to get a working history
const dom = new JSDOM(`<!DOCTYPE html><html><body></body></html>`, {
url: "https://remix.run/",
});
let testWindow = dom.window as unknown as Window;
testWindow.history.pushState({}, "", initialPath);
return testWindow;
}
2 changes: 1 addition & 1 deletion packages/react-router/__tests__/data-memory-router-test.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -887,7 +887,7 @@ describe("createMemoryRouter", () => {

spy.mockClear();
fireEvent.click(screen.getByText("Link to Child"));
await new Promise((r) => setTimeout(r, 0));
await waitFor(() => screen.getByText("Child"));

expect(getHtml(container)).toMatchInlineSnapshot(`
"<div>
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24 changes: 11 additions & 13 deletions packages/react-router/lib/components.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,6 @@ import type {
Location,
MemoryHistory,
Router as RemixRouter,
RouterState,
To,
LazyRouteFunction,
RelativeRoutingType,
Expand All @@ -19,7 +18,6 @@ import {
stripBasename,
UNSAFE_warning as warning,
} from "@remix-run/router";
import { useSyncExternalStore as useSyncExternalStoreShim } from "./use-sync-external-store-shim";

import type {
DataRouteObject,
Expand Down Expand Up @@ -57,17 +55,17 @@ export function RouterProvider({
fallbackElement,
router,
}: RouterProviderProps): React.ReactElement {
let getState = React.useCallback(() => router.state, [router]);

// Sync router state to our component state to force re-renders
let state: RouterState = useSyncExternalStoreShim(
router.subscribe,
getState,
// We have to provide this so React@18 doesn't complain during hydration,
// but we pass our serialized hydration data into the router so state here
// is already synced with what the server saw
getState
);
let [state, setState] = React.useState(router.state);

// Need to use a layout effect here so we are subscribed early enough to
// pick up on any render-driven redirects/navigations (useEffect/<Navigate>)
React.useLayoutEffect(() => {
return router.subscribe((newState) => {
if (newState !== state) {
setState(newState);
}
});
}, [router, state]);

let navigator = React.useMemo((): Navigator => {
return {
Expand Down
32 changes: 0 additions & 32 deletions packages/react-router/lib/use-sync-external-store-shim/index.ts
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152 changes: 0 additions & 152 deletions packages/react-router/lib/use-sync-external-store-shim/useSyncExternalStoreShimClient.ts
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20 changes: 0 additions & 20 deletions packages/react-router/lib/use-sync-external-store-shim/useSyncExternalStoreShimServer.ts
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