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fog-of-war-test.ts
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import { test, expect } from "@playwright/test";
import {
createAppFixture,
createFixture,
js,
} from "./helpers/create-fixture.js";
import { PlaywrightFixture } from "./helpers/playwright-fixture.js";
function getFiles() {
return {
"app/root.tsx": js`
import * as React from "react";
import { Link, Links, Meta, Outlet, Scripts } from "react-router";
export default function Root() {
let [showLink, setShowLink] = React.useState(false);
return (
<html lang="en">
<head>
<Meta />
<Links />
</head>
<body>
<Link to="/">Home</Link><br/>
<Link to="/a">/a</Link><br/>
<button onClick={() => setShowLink(true)}>Show Link</button>
{showLink ? <Link to="/a/b">/a/b</Link> : null}
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>
}
`,
"app/routes/a.tsx": js`
import { Link, Outlet, useLoaderData } from "react-router";
export function loader({ request }) {
return { message: "A LOADER" };
}
export default function Index() {
let data = useLoaderData();
return (
<>
<h1 id="a">A: {data.message}</h1>
<Link to="/a/b">/a/b</Link>
<Outlet/>
</>
)
}
`,
"app/routes/a.b.tsx": js`
import { Outlet, useLoaderData } from "react-router";
export function loader({ request }) {
return { message: "B LOADER" };
}
export default function Index() {
let data = useLoaderData();
return (
<>
<h2 id="b">B: {data.message}</h2>
<Outlet/>
</>
)
}
`,
"app/routes/a.b.c.tsx": js`
import { Outlet, useLoaderData } from "react-router";
export function loader({ request }) {
return { message: "C LOADER" };
}
export default function Index() {
let data = useLoaderData();
return <h3 id="c">C: {data.message}</h3>
}
`,
};
}
test.describe("Fog of War", () => {
let oldConsoleError: typeof console.error;
test.beforeEach(() => {
oldConsoleError = console.error;
});
test.afterEach(() => {
console.error = oldConsoleError;
});
test("loads minimal manifest on initial load", async ({ page }) => {
let fixture = await createFixture({
files: {
...getFiles(),
"app/entry.client.tsx": js`
import { HydratedRouter } from "react-router/dom";
import { startTransition, StrictMode } from "react";
import { hydrateRoot } from "react-dom/client";
startTransition(() => {
hydrateRoot(
document,
<StrictMode>
<HydratedRouter discover={"none"} />
</StrictMode>
);
});
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let res = await fixture.requestDocument("/");
let html = await res.text();
expect(html).toContain('"root": {');
expect(html).toContain('"routes/_index": {');
expect(html).not.toContain('"routes/a"');
// Linking to A loads A and succeeds
await app.goto("/", true);
await app.clickLink("/a");
await page.waitForSelector("#a");
expect(await app.getHtml("#a")).toBe(`<h1 id="a">A: A LOADER</h1>`);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toContain("routes/a");
});
test("prefetches initially rendered links", async ({ page }) => {
let fixture = await createFixture({
files: getFiles(),
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
await app.clickLink("/a");
await page.waitForSelector("#a");
expect(await app.getHtml("#a")).toBe(`<h1 id="a">A: A LOADER</h1>`);
});
test("prefetches links rendered via navigations", async ({ page }) => {
let fixture = await createFixture({
files: getFiles(),
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
await app.clickLink("/a");
await page.waitForSelector("#a");
await page.waitForFunction(
() => (window as any).__reactRouterManifest.routes["routes/a.b"]
);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a", "routes/a.b"]);
});
test("prefetches links rendered via in-page stateful updates", async ({
page,
}) => {
let fixture = await createFixture({
files: getFiles(),
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
await app.clickElement("button");
await page.waitForFunction(
() => (window as any).__reactRouterManifest.routes["routes/a.b"]
);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a", "routes/a.b"]);
});
test("prefetches links who opt-into [data-discover] via an in-page stateful update", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head> </head>
<body>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
import * as React from 'react';
import { Link, Outlet, useLoaderData } from "react-router";
export default function Index() {
let [discover, setDiscover] = React.useState(false)
return (
<>
<Link to="/a" discover={discover ? "render" : "none"}>/a</Link>
<button onClick={() => setDiscover(true)}>Toggle</button>
</>
)
}
`,
"app/routes/a.tsx": js`
export default function Index() {
return <h1 id="a">A</h1>
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index"]);
await app.clickElement("button");
await page.waitForFunction(
() => (window as any).__reactRouterManifest.routes["routes/a"]
);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
});
test('does not prefetch links with discover="none"', async ({ page }) => {
let fixture = await createFixture({
files: {
...getFiles(),
"app/routes/a.tsx": js`
import { Link, Outlet, useLoaderData } from "react-router";
export function loader({ request }) {
return { message: "A LOADER" };
}
export default function Index() {
let data = useLoaderData();
return (
<>
<h1 id="a">A: {data.message}</h1>
<Link to="/a/b" discover="none">/a/b</Link>
<Outlet/>
</>
)
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
await app.clickLink("/a");
await page.waitForSelector("#a");
await new Promise((resolve) => setTimeout(resolve, 250));
// /a/b is not discovered yet even thought it's rendered
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
// /a/b gets discovered on click
await app.clickLink("/a/b");
await page.waitForSelector("#b");
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a", "routes/a.b"]);
});
test("prefetches initially rendered forms", async ({ page }) => {
let fixture = await createFixture({
files: {
...getFiles(),
"app/root.tsx": js`
import * as React from "react";
import { Form, Links, Meta, Outlet, Scripts } from "react-router";
export default function Root() {
let [showLink, setShowLink] = React.useState(false);
return (
<html lang="en">
<head>
<Meta />
<Links />
</head>
<body>
<Form method="post" action="/a">
<button type="submit">Submit</button>
</Form>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/a.tsx": js`
import { useActionData } from "react-router";
export function action() {
return { message: "A ACTION" };
}
export default function Index() {
let actionData = useActionData();
return <h1 id="a">A: {actionData.message}</h1>
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
await page.waitForFunction(
() => (window as any).__reactRouterManifest.routes["routes/a"]
);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
await app.clickSubmitButton("/a");
await page.waitForSelector("#a");
expect(await app.getHtml("#a")).toBe(`<h1 id="a">A: A ACTION</h1>`);
});
test("prefetches forms rendered via navigations", async ({ page }) => {
let fixture = await createFixture({
files: {
...getFiles(),
"app/routes/a.tsx": js`
import { Form } from "react-router";
export default function Component() {
return (
<Form method="post" action="/a/b">
<button type="submit">Submit</button>
</Form>
);
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
await app.goto("/", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a"]);
await app.clickLink("/a");
await page.waitForSelector("form");
await page.waitForFunction(
() => (window as any).__reactRouterManifest.routes["routes/a.b"]
);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/a", "routes/a.b"]);
});
test("prefetches root index child when SSR-ing a deep route", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>
}
`,
"app/routes/deep.tsx": js`
import { Link } from "react-router";
export default function Component() {
return (
<>
<h1>Deep</h1>
<Link to="/" discover="none">Home</Link>
</>
)
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let manifestRequests: string[] = [];
page.on("request", (req) => {
if (req.url().includes("/__manifest")) {
manifestRequests.push(req.url());
}
});
await app.goto("/deep", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/deep", "routes/_index"]);
// Without pre-loading the index, we'd "match" `/` to just the root route
// client side and never fetch the `routes/_index` route
await app.clickLink("/");
await page.waitForSelector("#index");
expect(await app.getHtml("#index")).toMatch(`Index`);
expect(manifestRequests.length).toBe(0);
});
test("prefetches ancestor index children when SSR-ing a deep route", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Link, Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body >
<nav>
<Link to="/parent" discover="none">Parent Index</Link>
<Link to="/parent/child" discover="none">Child Index</Link>
</nav>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>
}
`,
"app/routes/parent.tsx": js`
import { Outlet } from "react-router";
export default function Component() {
return (
<>
<h1 id="parent">Parent</h1>
<Outlet />
</>
)
}
`,
"app/routes/parent._index.tsx": js`
export default function Component() {
return <h2 id="parent-index">Parent Index</h2>;
}
`,
"app/routes/parent.child.tsx": js`
import { Outlet } from "react-router";
export default function Component() {
return (
<>
<h2 id="child">Child</h2>
<Outlet />
</>
)
}
`,
"app/routes/parent.child._index.tsx": js`
export default function Component() {
return <h3 id="child-index">Child Index</h3>;
}
`,
"app/routes/parent.child.grandchild.tsx": js`
export default function Component() {
return <h3 id="grandchild">Grandchild</h3>;
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let manifestRequests: string[] = [];
page.on("request", (req) => {
if (req.url().includes("/__manifest")) {
manifestRequests.push(req.url());
}
});
await app.goto("/parent/child/grandchild", true);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual([
"root",
"routes/parent",
"routes/parent.child",
"routes/parent.child.grandchild",
"routes/_index",
"routes/parent.child._index",
"routes/parent._index",
]);
// Without pre-loading the index, we'd "match" `/parent/child` to just the
// parent and child routes client side and never fetch the
// `routes/parent.child._index` route
await app.clickLink("/parent/child");
await page.waitForSelector("#child-index");
expect(await app.getHtml("#parent")).toMatch("Parent");
expect(await app.getHtml("#child")).toMatch("Child");
expect(await app.getHtml("#child-index")).toMatch(`Child Index`);
await app.clickLink("/parent");
await page.waitForSelector("#parent-index");
expect(await app.getHtml("#parent")).toMatch(`Parent`);
expect(await app.getHtml("#parent-index")).toMatch(`Parent Index`);
expect(manifestRequests.length).toBe(0);
});
test("prefetches ancestor pathless children when SSR-ing a deep route", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Link, Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body >
<nav>
<Link to="/parent" discover="none">Parent Index</Link>
<Link to="/parent/child2" discover="none">Child2</Link>
</nav>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>
}
`,
"app/routes/parent.tsx": js`
import { Outlet } from "react-router";
export default function Component() {
return (
<>
<h1 id="parent">Parent</h1>
<Outlet />
</>
)
}
`,
"app/routes/parent.child.tsx": js`
export default function Component() {
return <h2 id="child">Child</h2>;
}
`,
"app/routes/parent._a.tsx": js`
import { Outlet } from 'react-router';
export default function Component() {
return <div id="a"><Outlet/></div>;
}
`,
"app/routes/parent._a._b._index.tsx": js`
export default function Component() {
return <h2 id="parent-index">Parent Pathless Index</h2>;
}
`,
"app/routes/parent._a._b.tsx": js`
import { Outlet } from 'react-router';
export default function Component() {
return <div id="b"><Outlet/></div>;
}
`,
"app/routes/parent._a._b.child2.tsx": js`
export default function Component() {
return <h2 id="child2">Child 2</h2>;
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let manifestRequests: string[] = [];
page.on("request", (req) => {
if (req.url().includes("/__manifest")) {
manifestRequests.push(req.url());
}
});
await app.goto("/parent/child", true);
expect(await app.getHtml("#child")).toMatch("Child");
expect(await page.$("#a")).toBeNull();
expect(await page.$("#b")).toBeNull();
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual([
"root",
"routes/parent",
"routes/parent.child",
"routes/_index",
"routes/parent._a",
"routes/parent._a._b",
"routes/parent._a._b._index",
]);
expect(manifestRequests).toEqual([]);
// Without pre-loading the index, we'd "match" `/parent` to just the
// parent route client side and never fetch the children pathless/index routes
await app.clickLink("/parent");
await page.waitForSelector("#parent-index");
expect(await page.$("#a")).not.toBeNull();
expect(await page.$("#b")).not.toBeNull();
expect(await app.getHtml("#parent")).toMatch("Parent");
expect(await app.getHtml("#parent-index")).toMatch("Parent Pathless Index");
expect(manifestRequests.length).toBe(0);
// This will require a new fetch for the child2 portion
await app.clickLink("/parent/child2");
await page.waitForSelector("#child2");
expect(await app.getHtml("#parent")).toMatch(`Parent`);
expect(await app.getHtml("#child2")).toMatch(`Child 2`);
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fparent%2Fchild2&version=/),
]);
});
test("detects higher-ranking static routes on the server when a slug match is already known by the client", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Link, Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body >
<nav>
<Link to="/something">/something</Link>
</nav>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>
}
`,
"app/routes/$slug.tsx": js`
import { Link } from "react-router";
export default function Component() {
return (
<>
<h2 id="slug">Slug</h2>;
<Link to="/static" discover="none">Go to /static</Link>
</>
);
}
`,
"app/routes/static.tsx": js`
export default function Component() {
return <h2 id="static">Static</h2>;
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let manifestRequests: string[] = [];
page.on("request", (req) => {
if (req.url().includes("/__manifest")) {
manifestRequests.push(req.url());
}
});
await app.goto("/", true);
expect(await app.getHtml("#index")).toMatch("Index");
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/$slug"]);
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fsomething&version=/),
]);
manifestRequests = [];
await app.clickLink("/something");
await page.waitForSelector("#slug");
expect(await app.getHtml("#slug")).toMatch("Slug");
expect(manifestRequests).toEqual([]);
// This will require a new fetch for the /static route
await app.clickLink("/static");
await page.waitForSelector("#static");
expect(await app.getHtml("#static")).toMatch("Static");
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fstatic&version=/),
]);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/$slug", "routes/static"]);
});
test("detects higher-ranking static routes on the server when a splat match is already known by the client", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Link, Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body >
<nav>
<Link to="/something">/something</Link>
</nav>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>
}
`,
"app/routes/$.tsx": js`
import { Link } from "react-router";
export default function Component() {
return (
<>
<h2 id="splat">Splat</h2>;
<Link to="/static" discover="none">Go to /static</Link>
</>
);
}
`,
"app/routes/static.tsx": js`
export default function Component() {
return <h2 id="static">Static</h2>;
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let manifestRequests: string[] = [];
page.on("request", (req) => {
if (req.url().includes("/__manifest")) {
manifestRequests.push(req.url());
}
});
await app.goto("/", true);
expect(await app.getHtml("#index")).toMatch("Index");
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/$"]);
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fsomething&version=/),
]);
manifestRequests = [];
await app.clickLink("/something");
await page.waitForSelector("#splat");
expect(await app.getHtml("#splat")).toMatch("Splat");
expect(manifestRequests).toEqual([]);
// This will require a new fetch for the /static route
await app.clickLink("/static");
await page.waitForSelector("#static");
expect(await app.getHtml("#static")).toMatch("Static");
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fstatic&version=/),
]);
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index", "routes/$", "routes/static"]);
});
test("does not re-request for previously discovered slug routes", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Link, Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body >
<nav>
<Link to="/" discover="none">Go to /</Link>
<Link to="/a" discover="none">Go to /a</Link>
<Link to="/b" discover="none">Go to /b</Link>
</nav>
<Outlet />
<Scripts />
</body>
</html>
);
}
`,
"app/routes/_index.tsx": js`
export default function Index() {
return <h1 id="index">Index</h1>;
}
`,
"app/routes/$slug.tsx": js`
import { Link, useParams } from "react-router";
export default function Component() {
let params = useParams();
return <h2 id="slug">Slug: {params.slug}</h2>;
}
`,
},
});
let appFixture = await createAppFixture(fixture);
let app = new PlaywrightFixture(appFixture, page);
let manifestRequests: string[] = [];
page.on("request", (req) => {
if (req.url().includes("/__manifest")) {
manifestRequests.push(req.url());
}
});
await app.goto("/", true);
expect(await app.getHtml("#index")).toMatch("Index");
expect(
await page.evaluate(() =>
Object.keys((window as any).__reactRouterManifest.routes)
)
).toEqual(["root", "routes/_index"]);
expect(manifestRequests.length).toBe(0);
// Click /a which will discover via a manifest request
await app.clickLink("/a");
await page.waitForSelector("#slug");
expect(await app.getHtml("#slug")).toMatch("Slug: a");
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fa&version=/),
]);
manifestRequests = [];
// Go back home
await app.clickLink("/");
await page.waitForSelector("#index");
expect(manifestRequests).toEqual([]);
// Click /a again which will not re-discover
await app.clickLink("/a");
await page.waitForSelector("#slug");
expect(await app.getHtml("#slug")).toMatch("Slug: a");
expect(manifestRequests).toEqual([]);
manifestRequests = [];
// Click /b which will need to discover
await app.clickLink("/b");
await page.waitForSelector("#slug");
expect(await app.getHtml("#slug")).toMatch("Slug: b");
expect(manifestRequests).toEqual([
expect.stringMatching(/\/__manifest\?p=%2Fb&version=/),
]);
});
test("does not re-request for previously discovered splat routes", async ({
page,
}) => {
let fixture = await createFixture({
files: {
"app/root.tsx": js`
import { Link, Outlet, Scripts } from "react-router";
export default function Root() {
return (
<html lang="en">
<head></head>
<body >
<nav>
<Link to="/" discover="none">Go to /</Link>
<Link to="/a" discover="none">Go to /a</Link>
<Link to="/b/c" discover="none">Go to /b/c</Link>
</nav>
<Outlet />
<Scripts />
</body>
</html>
);
}