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Constructor error message #11395

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merged 9 commits into from
Nov 1, 2017
Merged

Constructor error message #11395

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0ef3e10
Constructor test and fix complete
Oct 28, 2017
1034a19
Linters and prettier run
Oct 28, 2017
03dc163
Remove unnecessary checks
Oct 29, 2017
e9a0574
Update error message
Oct 29, 2017
51c5c71
Updat unit test
Oct 29, 2017
186062f
prettier
Oct 29, 2017
d739f86
Tweak the check to be more specific
gaearon Oct 31, 2017
0593cce
Move tests to ReactCompositeComponent-test
Nov 1, 2017
884e1b4
add error call count and remove line
Nov 1, 2017
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31 changes: 17 additions & 14 deletions packages/react-reconciler/src/ReactFiberClassComponent.js
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Original file line number Diff line number Diff line change
Expand Up @@ -202,21 +202,24 @@ module.exports = function(
const name = getComponentName(workInProgress);
const renderPresent = instance.render;

if (type.prototype && type.prototype.render !== undefined) {
warning(
renderPresent,
'%s(...): No `render` method found on the returned component ' +
'instance: is the `constructor` defined well?',
name,
);
} else {
warning(
renderPresent,
'%s(...): No `render` method found on the returned component ' +
'instance: you may have forgotten to define `render`.',
name,
);
if (!renderPresent) {
if (type.prototype && type.prototype.render !== undefined) {
warning(
false,
'%s(...): No `render` method found on the returned component ' +
'instance: is the `constructor` defined well?',
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Let's be explicit: "did you accidentally return an object from the constructor"

name,
);
} else {
warning(
false,
'%s(...): No `render` method found on the returned component ' +
'instance: you may have forgotten to define `render`.',
name,
);
}
}

const noGetInitialStateOnES6 =
!instance.getInitialState ||
instance.getInitialState.isReactClassApproved ||
Expand Down