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ReactDeprecationWarnings-test.js
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ReactDeprecationWarnings-test.js
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/**
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @emails react-core
*/
'use strict';
let React;
let ReactNoop;
let JSXDEVRuntime;
let waitForAll;
describe('ReactDeprecationWarnings', () => {
beforeEach(() => {
jest.resetModules();
React = require('react');
ReactNoop = require('react-noop-renderer');
const InternalTestUtils = require('internal-test-utils');
waitForAll = InternalTestUtils.waitForAll;
if (__DEV__) {
JSXDEVRuntime = require('react/jsx-dev-runtime');
}
});
it('should warn when given defaultProps', async () => {
function FunctionalComponent(props) {
return null;
}
FunctionalComponent.defaultProps = {
testProp: true,
};
ReactNoop.render(<FunctionalComponent />);
await expect(async () => await waitForAll([])).toErrorDev(
'Warning: FunctionalComponent: Support for defaultProps ' +
'will be removed from function components in a future major ' +
'release. Use JavaScript default parameters instead.',
);
});
it('should warn when given defaultProps on a memoized function', async () => {
const MemoComponent = React.memo(function FunctionalComponent(props) {
return null;
});
MemoComponent.defaultProps = {
testProp: true,
};
ReactNoop.render(
<div>
<MemoComponent />
</div>,
);
await expect(async () => await waitForAll([])).toErrorDev(
'Warning: FunctionalComponent: Support for defaultProps ' +
'will be removed from memo components in a future major ' +
'release. Use JavaScript default parameters instead.',
);
});
it('should warn when given string refs', async () => {
class RefComponent extends React.Component {
render() {
return null;
}
}
class Component extends React.Component {
render() {
return <RefComponent ref="refComponent" />;
}
}
ReactNoop.render(<Component />);
await expect(async () => await waitForAll([])).toErrorDev(
'Warning: Component "Component" contains the string ref "refComponent". ' +
'Support for string refs will be removed in a future major release. ' +
'We recommend using useRef() or createRef() instead. ' +
'Learn more about using refs safely here: ' +
'https://reactjs.org/link/strict-mode-string-ref' +
'\n in Component (at **)',
);
});
it('should warn when owner and self are the same for string refs', async () => {
class RefComponent extends React.Component {
render() {
return null;
}
}
class Component extends React.Component {
render() {
return <RefComponent ref="refComponent" __self={this} />;
}
}
expect(() => {
ReactNoop.renderLegacySyncRoot(<Component />);
}).toErrorDev([
'Component "Component" contains the string ref "refComponent". Support for string refs will be removed in a future major release.',
]);
await waitForAll([]);
});
it('should warn when owner and self are different for string refs', async () => {
class RefComponent extends React.Component {
render() {
return null;
}
}
class Component extends React.Component {
render() {
return <RefComponent ref="refComponent" __self={{}} />;
}
}
ReactNoop.render(<Component />);
await expect(async () => await waitForAll([])).toErrorDev([
'Warning: Component "Component" contains the string ref "refComponent". ' +
'Support for string refs will be removed in a future major release. ' +
'This case cannot be automatically converted to an arrow function. ' +
'We ask you to manually fix this case by using useRef() or createRef() instead. ' +
'Learn more about using refs safely here: ' +
'https://reactjs.org/link/strict-mode-string-ref',
]);
});
if (__DEV__) {
it('should warn when owner and self are different for string refs', async () => {
class RefComponent extends React.Component {
render() {
return null;
}
}
class Component extends React.Component {
render() {
return JSXDEVRuntime.jsxDEV(
RefComponent,
{ref: 'refComponent'},
null,
false,
{},
{},
);
}
}
ReactNoop.render(<Component />);
await expect(async () => await waitForAll([])).toErrorDev(
'Warning: Component "Component" contains the string ref "refComponent". ' +
'Support for string refs will be removed in a future major release. ' +
'This case cannot be automatically converted to an arrow function. ' +
'We ask you to manually fix this case by using useRef() or createRef() instead. ' +
'Learn more about using refs safely here: ' +
'https://reactjs.org/link/strict-mode-string-ref',
);
});
}
});