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Warn when multiple arguments were supplied to oneOf #244

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Feb 10, 2019
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Warn when multiple arguments were supplied to oneOf #244

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16 changes: 15 additions & 1 deletion __tests__/PropTypesDevelopmentReact15.js
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Original file line number Diff line number Diff line change
Expand Up @@ -894,11 +894,25 @@ describe('PropTypesDevelopmentReact15', () => {
it('should warn but not error for invalid argument', () => {
spyOn(console, 'error');

PropTypes.oneOf('red');

expect(console.error).toHaveBeenCalled();
expect(console.error.calls.argsFor(0)[0]).toContain(
'Invalid argument supplied to oneOf, expected an array.',
);

typeCheckPass(PropTypes.oneOf('red', 'blue'), 'red');
});

it('should warn but not error for invalid multiple arguments', () => {
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Why is it better to warn here, and not throw an error? Wouldn’t that surface it most rapidly?

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I totally agree - it's my first contribution to prop-types so I'm being cautious here. I didn't want the output of neither oneOf('red') nor oneOf('red', 'blue') to change, as this may be considered breaking by some. So I just "enhanced" an error message in one of the cases.

spyOn(console, 'error');

PropTypes.oneOf('red', 'blue');

expect(console.error).toHaveBeenCalled();
expect(console.error.calls.argsFor(0)[0]).toContain(
'Invalid argument supplied to oneOf, expected an instance of array.',
'Invalid arguments supplied to oneOf, expected an array, got 2 arguments. '
+ 'A common mistake is to write oneOf(x, y, z) instead of oneOf([x, y, z]).',
);

typeCheckPass(PropTypes.oneOf('red', 'blue'), 'red');
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16 changes: 15 additions & 1 deletion __tests__/PropTypesDevelopmentStandalone-test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -896,11 +896,25 @@ describe('PropTypesDevelopmentStandalone', () => {
it('should warn but not error for invalid argument', () => {
spyOn(console, 'error');

PropTypes.oneOf('red');

expect(console.error).toHaveBeenCalled();
expect(console.error.calls.argsFor(0)[0]).toContain(
'Invalid argument supplied to oneOf, expected an array.',
);

typeCheckPass(PropTypes.oneOf('red'), 'red');
});

it('should warn but not error for invalid multiple arguments', () => {
spyOn(console, 'error');

PropTypes.oneOf('red', 'blue');

expect(console.error).toHaveBeenCalled();
expect(console.error.calls.argsFor(0)[0]).toContain(
'Invalid argument supplied to oneOf, expected an instance of array.',
'Invalid arguments supplied to oneOf, expected an array, got 2 arguments. '
+ 'A common mistake is to write oneOf(x, y, z) instead of oneOf([x, y, z]).',
);

typeCheckPass(PropTypes.oneOf('red', 'blue'), 'red');
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11 changes: 10 additions & 1 deletion factoryWithTypeCheckers.js
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Expand Up @@ -290,7 +290,16 @@ module.exports = function(isValidElement, throwOnDirectAccess) {

function createEnumTypeChecker(expectedValues) {
if (!Array.isArray(expectedValues)) {
process.env.NODE_ENV !== 'production' ? printWarning('Invalid argument supplied to oneOf, expected an instance of array.') : void 0;
if (process.env.NODE_ENV !== 'production') {
if (arguments.length > 1) {
printWarning(
`Invalid arguments supplied to oneOf, expected an array, got ${arguments.length} arguments. ` +
`A common mistake is to write oneOf(x, y, z) instead of oneOf([x, y, z]).`
);
} else {
printWarning('Invalid argument supplied to oneOf, expected an array.');
}
}
return emptyFunctionThatReturnsNull;
}

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