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ReactDOMFizzStaticBrowser-test.js
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ReactDOMFizzStaticBrowser-test.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
// Polyfills for test environment
global.ReadableStream =
require('web-streams-polyfill/ponyfill/es6').ReadableStream;
global.TextEncoder = require('util').TextEncoder;
let React;
let ReactDOMFizzStatic;
let Suspense;
describe('ReactDOMFizzStaticBrowser', () => {
beforeEach(() => {
jest.resetModules();
React = require('react');
if (__EXPERIMENTAL__) {
ReactDOMFizzStatic = require('react-dom/static.browser');
}
Suspense = React.Suspense;
});
const theError = new Error('This is an error');
function Throw() {
throw theError;
}
const theInfinitePromise = new Promise(() => {});
function InfiniteSuspend() {
throw theInfinitePromise;
}
async function readContent(stream) {
const reader = stream.getReader();
let content = '';
while (true) {
const {done, value} = await reader.read();
if (done) {
return content;
}
content += Buffer.from(value).toString('utf8');
}
}
// @gate experimental
it('should call prerender', async () => {
const result = await ReactDOMFizzStatic.prerender(<div>hello world</div>);
const prelude = await readContent(result.prelude);
expect(prelude).toMatchInlineSnapshot(`"<div>hello world</div>"`);
});
// @gate experimental
it('should emit DOCTYPE at the root of the document', async () => {
const result = await ReactDOMFizzStatic.prerender(
<html>
<body>hello world</body>
</html>,
);
const prelude = await readContent(result.prelude);
if (gate(flags => flags.enableFloat)) {
expect(prelude).toMatchInlineSnapshot(
`"<!DOCTYPE html><html><head></head><body>hello world</body></html>"`,
);
} else {
expect(prelude).toMatchInlineSnapshot(
`"<!DOCTYPE html><html><body>hello world</body></html>"`,
);
}
});
// @gate experimental
it('should emit bootstrap script src at the end', async () => {
const result = await ReactDOMFizzStatic.prerender(<div>hello world</div>, {
bootstrapScriptContent: 'INIT();',
bootstrapScripts: ['init.js'],
bootstrapModules: ['init.mjs'],
});
const prelude = await readContent(result.prelude);
expect(prelude).toMatchInlineSnapshot(
`"<div>hello world</div><script>INIT();</script><script src="init.js" async=""></script><script type="module" src="init.mjs" async=""></script>"`,
);
});
// @gate experimental
it('emits all HTML as one unit', async () => {
let hasLoaded = false;
let resolve;
const promise = new Promise(r => (resolve = r));
function Wait() {
if (!hasLoaded) {
throw promise;
}
return 'Done';
}
const resultPromise = ReactDOMFizzStatic.prerender(
<div>
<Suspense fallback="Loading">
<Wait />
</Suspense>
</div>,
);
await jest.runAllTimers();
// Resolve the loading.
hasLoaded = true;
await resolve();
const result = await resultPromise;
const prelude = await readContent(result.prelude);
expect(prelude).toMatchInlineSnapshot(
`"<div><!--$-->Done<!-- --><!--/$--></div>"`,
);
});
// @gate experimental
it('should reject the promise when an error is thrown at the root', async () => {
const reportedErrors = [];
let caughtError = null;
try {
await ReactDOMFizzStatic.prerender(
<div>
<Throw />
</div>,
{
onError(x) {
reportedErrors.push(x);
},
},
);
} catch (error) {
caughtError = error;
}
expect(caughtError).toBe(theError);
expect(reportedErrors).toEqual([theError]);
});
// @gate experimental
it('should reject the promise when an error is thrown inside a fallback', async () => {
const reportedErrors = [];
let caughtError = null;
try {
await ReactDOMFizzStatic.prerender(
<div>
<Suspense fallback={<Throw />}>
<InfiniteSuspend />
</Suspense>
</div>,
{
onError(x) {
reportedErrors.push(x);
},
},
);
} catch (error) {
caughtError = error;
}
expect(caughtError).toBe(theError);
expect(reportedErrors).toEqual([theError]);
});
// @gate experimental
it('should not error the stream when an error is thrown inside suspense boundary', async () => {
const reportedErrors = [];
const result = await ReactDOMFizzStatic.prerender(
<div>
<Suspense fallback={<div>Loading</div>}>
<Throw />
</Suspense>
</div>,
{
onError(x) {
reportedErrors.push(x);
},
},
);
const prelude = await readContent(result.prelude);
expect(prelude).toContain('Loading');
expect(reportedErrors).toEqual([theError]);
});
// @gate experimental
it('should be able to complete by aborting even if the promise never resolves', async () => {
const errors = [];
const controller = new AbortController();
const resultPromise = ReactDOMFizzStatic.prerender(
<div>
<Suspense fallback={<div>Loading</div>}>
<InfiniteSuspend />
</Suspense>
</div>,
{
signal: controller.signal,
onError(x) {
errors.push(x.message);
},
},
);
await jest.runAllTimers();
controller.abort();
const result = await resultPromise;
const prelude = await readContent(result.prelude);
expect(prelude).toContain('Loading');
expect(errors).toEqual(['The operation was aborted.']);
});
// @gate experimental
it('should reject if aborting before the shell is complete', async () => {
const errors = [];
const controller = new AbortController();
const promise = ReactDOMFizzStatic.prerender(
<div>
<InfiniteSuspend />
</div>,
{
signal: controller.signal,
onError(x) {
errors.push(x.message);
},
},
);
await jest.runAllTimers();
const theReason = new Error('aborted for reasons');
controller.abort(theReason);
let caughtError = null;
try {
await promise;
} catch (error) {
caughtError = error;
}
expect(caughtError).toBe(theReason);
expect(errors).toEqual(['aborted for reasons']);
});
// @gate experimental
it('should be able to abort before something suspends', async () => {
const errors = [];
const controller = new AbortController();
function App() {
controller.abort();
return (
<Suspense fallback={<div>Loading</div>}>
<InfiniteSuspend />
</Suspense>
);
}
const streamPromise = ReactDOMFizzStatic.prerender(
<div>
<App />
</div>,
{
signal: controller.signal,
onError(x) {
errors.push(x.message);
},
},
);
let caughtError = null;
try {
await streamPromise;
} catch (error) {
caughtError = error;
}
expect(caughtError.message).toBe('The operation was aborted.');
expect(errors).toEqual(['The operation was aborted.']);
});
// @gate experimental
it('should reject if passing an already aborted signal', async () => {
const errors = [];
const controller = new AbortController();
const theReason = new Error('aborted for reasons');
controller.abort(theReason);
const promise = ReactDOMFizzStatic.prerender(
<div>
<Suspense fallback={<div>Loading</div>}>
<InfiniteSuspend />
</Suspense>
</div>,
{
signal: controller.signal,
onError(x) {
errors.push(x.message);
},
},
);
// Technically we could still continue rendering the shell but currently the
// semantics mean that we also abort any pending CPU work.
let caughtError = null;
try {
await promise;
} catch (error) {
caughtError = error;
}
expect(caughtError).toBe(theReason);
expect(errors).toEqual(['aborted for reasons']);
});
// @gate experimental
it('supports custom abort reasons with a string', async () => {
const promise = new Promise(r => {});
function Wait() {
throw promise;
}
function App() {
return (
<div>
<p>
<Suspense fallback={'p'}>
<Wait />
</Suspense>
</p>
<span>
<Suspense fallback={'span'}>
<Wait />
</Suspense>
</span>
</div>
);
}
const errors = [];
const controller = new AbortController();
const resultPromise = ReactDOMFizzStatic.prerender(<App />, {
signal: controller.signal,
onError(x) {
errors.push(x);
return 'a digest';
},
});
controller.abort('foobar');
await resultPromise;
expect(errors).toEqual(['foobar', 'foobar']);
});
// @gate experimental
it('supports custom abort reasons with an Error', async () => {
const promise = new Promise(r => {});
function Wait() {
throw promise;
}
function App() {
return (
<div>
<p>
<Suspense fallback={'p'}>
<Wait />
</Suspense>
</p>
<span>
<Suspense fallback={'span'}>
<Wait />
</Suspense>
</span>
</div>
);
}
const errors = [];
const controller = new AbortController();
const resultPromise = ReactDOMFizzStatic.prerender(<App />, {
signal: controller.signal,
onError(x) {
errors.push(x.message);
return 'a digest';
},
});
controller.abort(new Error('uh oh'));
await resultPromise;
expect(errors).toEqual(['uh oh', 'uh oh']);
});
});