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Don't warn about concurrently rendering contexts if we finished rendering #22797

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merged 5 commits into from
Jan 12, 2023
Merged

Don't warn about concurrently rendering contexts if we finished rendering #22797

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67b5c96
Expected behavior
eps1lon Nov 20, 2021
bb33098
Don't warn about concurrent provider renders if we finished rendering
eps1lon Nov 20, 2021
91b9705
Only need to reset in DEV since we only set in DEV
eps1lon Nov 20, 2021
2ab9b80
Restore currentRenderN instead of resetting it
eps1lon Mar 5, 2022
4e9a32e
Update packages/react-reconciler/src/__tests__/ReactNewContext-test.js
eps1lon Jan 11, 2023
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27 changes: 26 additions & 1 deletion packages/react-reconciler/src/ReactFiberNewContext.js
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,15 @@ import {REACT_SERVER_CONTEXT_DEFAULT_VALUE_NOT_LOADED} from 'shared/ReactSymbols

const valueCursor: StackCursor<mixed> = createCursor(null);

let rendererCursorDEV: StackCursor<Object | null>;
if (__DEV__) {
rendererCursorDEV = createCursor(null);
}
let renderer2CursorDEV: StackCursor<Object | null>;
if (__DEV__) {
renderer2CursorDEV = createCursor(null);
}

let rendererSigil;
if (__DEV__) {
// Use this to detect multiple renderers using the same context
Expand Down Expand Up @@ -94,6 +103,8 @@ export function pushProvider<T>(

context._currentValue = nextValue;
if (__DEV__) {
push(rendererCursorDEV, context._currentRenderer, providerFiber);

if (
context._currentRenderer !== undefined &&
context._currentRenderer !== null &&
Expand All @@ -111,6 +122,8 @@ export function pushProvider<T>(

context._currentValue2 = nextValue;
if (__DEV__) {
push(renderer2CursorDEV, context._currentRenderer2, providerFiber);

if (
context._currentRenderer2 !== undefined &&
context._currentRenderer2 !== null &&
Expand All @@ -131,7 +144,7 @@ export function popProvider(
providerFiber: Fiber,
): void {
const currentValue = valueCursor.current;
pop(valueCursor, providerFiber);

if (isPrimaryRenderer) {
if (
enableServerContext &&
Expand All @@ -141,6 +154,11 @@ export function popProvider(
} else {
context._currentValue = currentValue;
}
if (__DEV__) {
const currentRenderer = rendererCursorDEV.current;
pop(rendererCursorDEV, providerFiber);
context._currentRenderer = currentRenderer;
}
} else {
if (
enableServerContext &&
Expand All @@ -150,7 +168,14 @@ export function popProvider(
} else {
context._currentValue2 = currentValue;
}
if (__DEV__) {
const currentRenderer2 = renderer2CursorDEV.current;
pop(renderer2CursorDEV, providerFiber);
context._currentRenderer2 = currentRenderer2;
}
}

pop(valueCursor, providerFiber);
}

export function scheduleContextWorkOnParentPath(
Expand Down
42 changes: 42 additions & 0 deletions packages/react-reconciler/src/__tests__/ReactNewContext-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -874,6 +874,48 @@ describe('ReactNewContext', () => {
}
});

it('does not warn if multiple renderers use the same context sequentially', () => {
spyOnDev(console, 'error');
const Context = React.createContext(0);

function Foo(props) {
Scheduler.unstable_yieldValue('Foo');
return null;
}

function App(props) {
return (
<Context.Provider value={props.value}>
<Foo />
<Foo />
</Context.Provider>
);
}

if (gate(flags => flags.enableSyncDefaultUpdates)) {
React.startTransition(() => {
ReactNoop.render(<App value={1} />);
});
} else {
ReactNoop.render(<App value={1} />);
}
expect(Scheduler).toFlushAndYield(['Foo', 'Foo']);
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The test above ("warns if multiple renderers concurrently render the same context") did not commit here. Without committing I would expect the warning. But here we actually commit so I don't think we should warn.


// Get a new copy of ReactNoop
jest.resetModules();
React = require('react');
ReactNoop = require('react-noop-renderer');
Scheduler = require('scheduler');

// Render the provider again using a different renderer
ReactNoop.render(<App value={1} />);
expect(Scheduler).toFlushAndYield(['Foo', 'Foo']);

if (__DEV__) {
expect(console.error).not.toHaveBeenCalled();
}
});

it('provider bails out if children and value are unchanged (like sCU)', () => {
const Context = React.createContext(0);

Expand Down