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Add a clearer error message for the Consumer render (#12241) #12267

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Feb 22, 2018
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Add a clearer error message for the Consumer render (#12241) #12267

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10 changes: 10 additions & 0 deletions packages/react-reconciler/src/ReactFiberBeginWork.js
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Original file line number Diff line number Diff line change
Expand Up @@ -869,6 +869,16 @@ export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(
workInProgress.stateNode = observedBits;

const render = newProps.children;

if (typeof render !== 'function') {
invariant(
false,
"A context consumer was rendered with multiple children, or a child that isn't a function. " +
'A context consumer expects a single child that is a function. ' +
'If you did pass a function, make sure there is no trailing or leading whitespace around it.',
);
}

const newChildren = render(newValue);
reconcileChildren(current, workInProgress, newChildren);
return workInProgress.child;
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