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getDisplayName.js
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Fri, Jan 24, 18:50

getDisplayName.js
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import { ForwardRef, Memo } from 'react-is';
// Simplified polyfill for IE11 support
// https://github.com/JamesMGreene/Function.name/blob/58b314d4a983110c3682f1228f845d39ccca1817/Function.name.js#L3
const fnNameMatchRegex = /^\s*function(?:\s|\s*\/\*.*\*\/\s*)+([^(\s/]*)\s*/;
export function getFunctionName(fn) {
const match = `${fn}`.match(fnNameMatchRegex);
const name = match && match[1];
return name || '';
}
function getFunctionComponentName(Component, fallback = '') {
return Component.displayName || Component.name || getFunctionName(Component) || fallback;
}
function getWrappedName(outerType, innerType, wrapperName) {
const functionName = getFunctionComponentName(innerType);
return outerType.displayName || (functionName !== '' ? `${wrapperName}(${functionName})` : wrapperName);
}
/**
* cherry-pick from
* https://github.com/facebook/react/blob/769b1f270e1251d9dbdce0fcbd9e92e502d059b8/packages/shared/getComponentName.js
* originally forked from recompose/getDisplayName with added IE11 support
*/
export default function getDisplayName(Component) {
if (Component == null) {
return undefined;
}
if (typeof Component === 'string') {
return Component;
}
if (typeof Component === 'function') {
return getFunctionComponentName(Component, 'Component');
}
// TypeScript can't have components as objects but they exist in the form of `memo` or `Suspense`
if (typeof Component === 'object') {
switch (Component.$$typeof) {
case ForwardRef:
return getWrappedName(Component, Component.render, 'ForwardRef');
case Memo:
return getWrappedName(Component, Component.type, 'memo');
default:
return undefined;
}
}
return undefined;
}

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