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feat: honor displayName of context types (#18035)
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* test: Add test for current behavior of displayName
* feat: consider displayName of context types
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Brian Vaughn authored Mar 4, 2020
1 parent 83c3ed2 commit 45c172d
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Showing 3 changed files with 38 additions and 2 deletions.
5 changes: 5 additions & 0 deletions packages/react/src/ReactContext.js
Original file line number Diff line number Diff line change
Expand Up @@ -120,6 +120,11 @@ export function createContext<T>(
return context.Consumer;
},
},
displayName: {
get() {
return context.displayName;
},
},
});
// $FlowFixMe: Flow complains about missing properties because it doesn't understand defineProperty
context.Consumer = Consumer;
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24 changes: 24 additions & 0 deletions packages/react/src/__tests__/ReactContextValidator-test.js
Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
let PropTypes;
let React;
let ReactDOM;
let ReactDOMServer;
let ReactTestUtils;

describe('ReactContextValidator', () => {
Expand All @@ -27,6 +28,7 @@ describe('ReactContextValidator', () => {
PropTypes = require('prop-types');
React = require('react');
ReactDOM = require('react-dom');
ReactDOMServer = require('react-dom/server');
ReactTestUtils = require('react-dom/test-utils');
});

Expand Down Expand Up @@ -671,4 +673,26 @@ describe('ReactContextValidator', () => {
'Warning: ComponentB: Function components do not support contextType.',
);
});

it('should honor a displayName if set on the context type', () => {
const Context = React.createContext(null);
Context.displayName = 'MyContextType';
function Validator() {
return null;
}
Validator.propTypes = {dontPassToSeeErrorStack: PropTypes.bool.isRequired};

expect(() => {
ReactDOMServer.renderToStaticMarkup(
<Context.Provider>
<Context.Consumer>{() => <Validator />}</Context.Consumer>
</Context.Provider>,
);
}).toErrorDev(
'Warning: Failed prop type: The prop `dontPassToSeeErrorStack` is marked as required in `Validator`, but its value is `undefined`.\n' +
' in Validator (at **)\n' +
' in MyContextType.Consumer (at **)\n' +
' in MyContextType.Provider (at **)',
);
});
});
11 changes: 9 additions & 2 deletions packages/shared/getComponentName.js
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ import {
REACT_BLOCK_TYPE,
} from 'shared/ReactSymbols';
import {refineResolvedLazyComponent} from 'shared/ReactLazyComponent';
import type {ReactContext, ReactProviderType} from 'shared/ReactTypes';

function getWrappedName(
outerType: mixed,
Expand All @@ -37,6 +38,10 @@ function getWrappedName(
);
}

function getContextName(type: ReactContext<any>) {
return type.displayName || 'Context';
}

function getComponentName(type: mixed): string | null {
if (type == null) {
// Host root, text node or just invalid type.
Expand Down Expand Up @@ -73,9 +78,11 @@ function getComponentName(type: mixed): string | null {
if (typeof type === 'object') {
switch (type.$$typeof) {
case REACT_CONTEXT_TYPE:
return 'Context.Consumer';
const context: ReactContext<any> = (type: any);
return getContextName(context) + '.Consumer';
case REACT_PROVIDER_TYPE:
return 'Context.Provider';
const provider: ReactProviderType<any> = (type: any);
return getContextName(provider._context) + '.Provider';
case REACT_FORWARD_REF_TYPE:
return getWrappedName(type, type.render, 'ForwardRef');
case REACT_MEMO_TYPE:
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