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Merged
merged 3 commits into from
Nov 16, 2022
+149 −108
Merged

Turn on key spread warning in jsx-runtime for everyone #25697

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ecc47e2
Improve key spread warning
sebmarkbage Nov 16, 2022
2736161
Turn on key spread warning in jsx-runtime for everyone
sebmarkbage Nov 16, 2022
92daf55
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sebmarkbage Nov 16, 2022
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Improve key spread warning 
This should suggest that the key is put first, not last.
  • Loading branch information
@sebmarkbage
sebmarkbage committed Nov 16, 2022
commit ecc47e2019c8f805b4aaff90cf19df34039dc536
199 changes: 109 additions & 90 deletions packages/react/src/ReactElementValidator.js
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Original file line number Diff line number Diff line change
Expand Up @@ -279,6 +279,8 @@ function validateFragmentProps(fragment) {
}
}

const didWarnAboutKeySpread = {};

export function jsxWithValidation(
type,
props,
Expand All @@ -287,115 +289,132 @@ export function jsxWithValidation(
source,
self,
) {
const validType = isValidElementType(type);

// We warn in this case but don't throw. We expect the element creation to
// succeed and there will likely be errors in render.
if (!validType) {
let info = '';
if (
type === undefined ||
(typeof type === 'object' &&
type !== null &&
Object.keys(type).length === 0)
) {
info +=
' You likely forgot to export your component from the file ' +
"it's defined in, or you might have mixed up default and named imports.";
}
if (__DEV__) {
const validType = isValidElementType(type);

// We warn in this case but don't throw. We expect the element creation to
// succeed and there will likely be errors in render.
if (!validType) {
let info = '';
if (
type === undefined ||
(typeof type === 'object' &&
type !== null &&
Object.keys(type).length === 0)
) {
info +=
' You likely forgot to export your component from the file ' +
"it's defined in, or you might have mixed up default and named imports.";
}

const sourceInfo = getSourceInfoErrorAddendum(source);
if (sourceInfo) {
info += sourceInfo;
} else {
info += getDeclarationErrorAddendum();
}
const sourceInfo = getSourceInfoErrorAddendum(source);
if (sourceInfo) {
info += sourceInfo;
} else {
info += getDeclarationErrorAddendum();
}

let typeString;
if (type === null) {
typeString = 'null';
} else if (isArray(type)) {
typeString = 'array';
} else if (type !== undefined && type.$$typeof === REACT_ELEMENT_TYPE) {
typeString = `<${getComponentNameFromType(type.type) || 'Unknown'} />`;
info =
' Did you accidentally export a JSX literal instead of a component?';
} else {
typeString = typeof type;
}
let typeString;
if (type === null) {
typeString = 'null';
} else if (isArray(type)) {
typeString = 'array';
} else if (type !== undefined && type.$$typeof === REACT_ELEMENT_TYPE) {
typeString = `<${getComponentNameFromType(type.type) || 'Unknown'} />`;
info =
' Did you accidentally export a JSX literal instead of a component?';
} else {
typeString = typeof type;
}

if (__DEV__) {
console.error(
'React.jsx: type is invalid -- expected a string (for ' +
'built-in components) or a class/function (for composite ' +
'components) but got: %s.%s',
typeString,
info,
);
if (__DEV__) {
console.error(
'React.jsx: type is invalid -- expected a string (for ' +
'built-in components) or a class/function (for composite ' +
'components) but got: %s.%s',
typeString,
info,
);
}
}
}

const element = jsxDEV(type, props, key, source, self);

// The result can be nullish if a mock or a custom function is used.
// TODO: Drop this when these are no longer allowed as the type argument.
if (element == null) {
return element;
}

// Skip key warning if the type isn't valid since our key validation logic
// doesn't expect a non-string/function type and can throw confusing errors.
// We don't want exception behavior to differ between dev and prod.
// (Rendering will throw with a helpful message and as soon as the type is
// fixed, the key warnings will appear.)
const element = jsxDEV(type, props, key, source, self);

if (validType) {
const children = props.children;
if (children !== undefined) {
if (isStaticChildren) {
if (isArray(children)) {
for (let i = 0; i < children.length; i++) {
validateChildKeys(children[i], type);
}
// The result can be nullish if a mock or a custom function is used.
// TODO: Drop this when these are no longer allowed as the type argument.
if (element == null) {
return element;
}

if (Object.freeze) {
Object.freeze(children);
// Skip key warning if the type isn't valid since our key validation logic
// doesn't expect a non-string/function type and can throw confusing errors.
// We don't want exception behavior to differ between dev and prod.
// (Rendering will throw with a helpful message and as soon as the type is
// fixed, the key warnings will appear.)

if (validType) {
const children = props.children;
if (children !== undefined) {
if (isStaticChildren) {
if (isArray(children)) {
for (let i = 0; i < children.length; i++) {
validateChildKeys(children[i], type);
}

if (Object.freeze) {
Object.freeze(children);
}
} else {
if (__DEV__) {
console.error(
'React.jsx: Static children should always be an array. ' +
'You are likely explicitly calling React.jsxs or React.jsxDEV. ' +
'Use the Babel transform instead.',
);
}
}
} else {
if (__DEV__) {
console.error(
'React.jsx: Static children should always be an array. ' +
'You are likely explicitly calling React.jsxs or React.jsxDEV. ' +
'Use the Babel transform instead.',
);
}
validateChildKeys(children, type);
}
} else {
validateChildKeys(children, type);
}
}
}

if (__DEV__) {
if (warnAboutSpreadingKeyToJSX) {
if (hasOwnProperty.call(props, 'key')) {
console.error(
'React.jsx: Spreading a key to JSX is a deprecated pattern. ' +
'Explicitly pass a key after spreading props in your JSX call. ' +
'E.g. <%s {...props} key={key} />',
getComponentNameFromType(type) || 'ComponentName',
);
const componentName = getComponentNameFromType(type);
const keys = Object.keys(props);
const beforeExample = '{' + keys.join(': ..., ') + ': ...}';
if (!didWarnAboutKeySpread[componentName + beforeExample]) {
const keysWithoutKey = keys.filter(k => k !== 'key');
const afterExample =
keysWithoutKey.length > 0
? '{' + keysWithoutKey.join(': ..., ') + ': ...}'
: '{}';
console.error(
'An props object containing a "key" prop is being spread into JSX:\n' +
' let props = %s;\n' +
' <%s {...props} />\n' +
'React keys must be passed directly to JSX without using spread:\n' +
' let props = %s;\n' +
' <%s key={...} {...props} />',
beforeExample,
componentName,
afterExample,
componentName,
);
didWarnAboutKeySpread[componentName + beforeExample] = true;
}
}
}
}

if (type === REACT_FRAGMENT_TYPE) {
validateFragmentProps(element);
} else {
validatePropTypes(element);
}
if (type === REACT_FRAGMENT_TYPE) {
validateFragmentProps(element);
} else {
validatePropTypes(element);
}

return element;
return element;
}
}

// These two functions exist to still get child warnings in dev
Expand Down
9 changes: 6 additions & 3 deletions packages/react/src/__tests__/ReactElementJSX-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -282,9 +282,12 @@ describe('ReactElement.jsx', () => {
expect(() =>
ReactDOM.render(JSXRuntime.jsx(Parent, {}), container),
).toErrorDev(
'Warning: React.jsx: Spreading a key to JSX is a deprecated pattern. ' +
'Explicitly pass a key after spreading props in your JSX call. ' +
'E.g. <Child {...props} key={key} />',
'Warning: An props object containing a "key" prop is being spread into JSX:\n' +
' let props = {key: ...};\n' +
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@gaearon gaearon Nov 16, 2022

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Let's do key: someKey to avoid using ... both as syntax and a placeholder?

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@sebmarkbage sebmarkbage Nov 16, 2022

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It's a non-trivial change in the code but I'll try.

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@sebmarkbage sebmarkbage Nov 16, 2022

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Well, maybe it doesn't make sense. Because it still writes out the other properties with ....

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@sebmarkbage sebmarkbage Nov 16, 2022

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I put the key in the front even if that's not the regular order and kept ... for other props.

' <Child {...props} />\n' +
'React keys must be passed directly to JSX without using spread:\n' +
' let props = {};\n' +
' <Child key={...} {...props} />',
);
});
}
Expand Down
31 changes: 25 additions & 6 deletions packages/react/src/jsx/ReactJSXElementValidator.js
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Original file line number Diff line number Diff line change
Expand Up @@ -294,6 +294,8 @@ function validateFragmentProps(fragment) {
}
}

const didWarnAboutKeySpread = {};

export function jsxWithValidation(
type,
props,
Expand Down Expand Up @@ -390,12 +392,29 @@ export function jsxWithValidation(

if (warnAboutSpreadingKeyToJSX) {
if (hasOwnProperty.call(props, 'key')) {
console.error(
'React.jsx: Spreading a key to JSX is a deprecated pattern. ' +
'Explicitly pass a key after spreading props in your JSX call. ' +
'E.g. <%s {...props} key={key} />',
getComponentNameFromType(type) || 'ComponentName',
);
const componentName = getComponentNameFromType(type);
const keys = Object.keys(props);
const beforeExample = '{' + keys.join(': ..., ') + ': ...}';
if (!didWarnAboutKeySpread[componentName + beforeExample]) {
const keysWithoutKey = keys.filter(k => k !== 'key');
const afterExample =
keysWithoutKey.length > 0
? '{' + keysWithoutKey.join(': ..., ') + ': ...}'
: '{}';
console.error(
'An props object containing a "key" prop is being spread into JSX:\n' +
' let props = %s;\n' +
' <%s {...props} />\n' +
'React keys must be passed directly to JSX without using spread:\n' +
' let props = %s;\n' +
' <%s key={...} {...props} />',
beforeExample,
componentName,
afterExample,
componentName,
);
didWarnAboutKeySpread[componentName + beforeExample] = true;
}
}
}

Expand Down