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Fixed invalid prop types error message to be more specific #11308

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Oct 31, 2017
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38 changes: 20 additions & 18 deletions packages/react-dom/src/shared/ReactDOMUnknownPropertyHook.js
Original file line number Diff line number Diff line change
Expand Up @@ -180,26 +180,28 @@ if (__DEV__) {
return true;
}

if (typeof value === 'boolean' && value === false) {
warning(
DOMProperty.shouldAttributeAcceptBooleanValue(name),
'If you mean to conditionally pass an attribute, use a ternary ' +
'expression: `%s`={condition ? value : undefined} instead of ' +
'{condition && value}.%s',
value,
getStackAddendum(),
);
if (typeof value === 'boolean') {
if (value === true) {
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Nit: we already know it's a boolean so can just write if (value)

warning(
DOMProperty.shouldAttributeAcceptBooleanValue(name),
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Can we make this warning(false and move out this (negated) condition together with the top one?

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@NicBonetto NicBonetto Oct 26, 2017

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Yes :) Just so I have a correct understanding, the refactor will look like:

if (typeof value === 'boolean' && !false) {
  if (value === true) {
    warning(false,
      ...
    );
  } else {
    warning(false,
      ...
    );
  }
  ...
}

Is this the branching logic you prefer? I do not understand the !false condition, so if I am incorrect please explain what should take it's place.

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if (typeof value === 'boolean' && !DOMProperty.shouldAttributeAcceptBooleanValue(name)) {
  if (value === true) {
    warning(false,
      ...
    );
  } else {
    warning(false,
      ...
    );
  }
  ...
}

'Received `%s` for non-boolean attribute `%s`. If this is expected, cast ' +
'the value to a string.%s',
value,
name,
getStackAddendum(),
);
} else {
warning(
DOMProperty.shouldAttributeAcceptBooleanValue(name),
'If you mean to conditionally pass an attribute, use a ternary ' +
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Can this also start with Received ... for non-boolean attribute ...? I want both messages to look similar, but with different second sentences.

'expression: `%s`={condition ? value : undefined} instead of ' +
'{condition && value}.%s',
value,
getStackAddendum(),
);
}
warnedProperties[name] = true;
return true;
} else if (typeof value === 'boolean') {
warning(
DOMProperty.shouldAttributeAcceptBooleanValue(name),
'Received `%s` for non-boolean attribute `%s`. If this is expected, cast ' +
'the value to a string.%s',
value,
name,
getStackAddendum(),
);
}

// Now that we've validated casing, do not validate
Expand Down