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Add warning in server renderer if class doesn't extend React.Component #11993

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merged 4 commits into from
Jan 9, 2018
Merged

Add warning in server renderer if class doesn't extend React.Component #11993

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6499aba
Add warning in server renderer if class doesn't extend React.Component
wyze Jan 8, 2018
0ed0dae
Use `.toWarnDev` matcher and deduplicate warnings
wyze Jan 8, 2018
2aaabea
Deduplicate client-side warning if class doesn't extend React.Component
wyze Jan 9, 2018
5a06117
Default componentName to Unknown if null
wyze Jan 9, 2018
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5 changes: 5 additions & 0 deletions packages/react-dom/src/__tests__/ReactCompositeComponent-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -338,6 +338,11 @@ describe('ReactCompositeComponent', () => {
'Change ClassWithRenderNotExtended to extend React.Component instead.',
);
}).toThrow(TypeError);

// Test deduplication
expect(() => {
ReactDOM.render(<ClassWithRenderNotExtended />, container);
}).toThrow(TypeError);
});

it('should warn about `setState` in render', () => {
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20 changes: 13 additions & 7 deletions packages/react-reconciler/src/ReactFiberBeginWork.js
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Original file line number Diff line number Diff line change
Expand Up @@ -60,9 +60,11 @@ import {
import {NoWork, Never} from './ReactFiberExpirationTime';

let warnedAboutStatelessRefs;
let didWarnAboutBadClass;

if (__DEV__) {
warnedAboutStatelessRefs = {};
didWarnAboutBadClass = {};
}

export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
Expand Down Expand Up @@ -459,13 +461,17 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
if (__DEV__) {
if (fn.prototype && typeof fn.prototype.render === 'function') {
const componentName = getComponentName(workInProgress);
warning(
false,
"The <%s /> component appears to have a render method, but doesn't extend React.Component. " +
'This is likely to cause errors. Change %s to extend React.Component instead.',
componentName,
componentName,
);

if (componentName !== null && !didWarnAboutBadClass[componentName]) {
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If it's null we still want to show the message. Let's just say getComponentName(workInProgress) || 'Unknown'

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I added that to make Flow happy, but your solution is better. I should do the same default on the server side warning too, correct?

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Yep, thanks!

warning(
false,
"The <%s /> component appears to have a render method, but doesn't extend React.Component. " +
'This is likely to cause errors. Change %s to extend React.Component instead.',
componentName,
componentName,
);
didWarnAboutBadClass[componentName] = true;
}
}
ReactCurrentOwner.current = workInProgress;
value = fn(props, context);
Expand Down