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index.js
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Created: Wed, Jan 22, 10:31

index.js
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	/**
	* Copyright 2015, Yahoo! Inc.
	* Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
	*/
	import { ForwardRef, Memo, isMemo } from 'react-is';

	const REACT_STATICS = {
	childContextTypes: true,
	contextType: true,
	contextTypes: true,
	defaultProps: true,
	displayName: true,
	getDefaultProps: true,
	getDerivedStateFromError: true,
	getDerivedStateFromProps: true,
	mixins: true,
	propTypes: true,
	type: true
	};

	const KNOWN_STATICS = {
	name: true,
	length: true,
	prototype: true,
	caller: true,
	callee: true,
	arguments: true,
	arity: true
	};

	const FORWARD_REF_STATICS = {
	'$$typeof': true,
	render: true,
	defaultProps: true,
	displayName: true,
	propTypes: true
	};

	const MEMO_STATICS = {
	'$$typeof': true,
	compare: true,
	defaultProps: true,
	displayName: true,
	propTypes: true,
	type: true,
	}

	const TYPE_STATICS = {};
	TYPE_STATICS[ForwardRef] = FORWARD_REF_STATICS;
	TYPE_STATICS[Memo] = MEMO_STATICS;

	function getStatics(component) {
	// React v16.11 and below
	if (isMemo(component)) {
	return MEMO_STATICS;
	}

	// React v16.12 and above
	return TYPE_STATICS[component['$$typeof']] \|\| REACT_STATICS;
	}

	const defineProperty = Object.defineProperty;
	const getOwnPropertyNames = Object.getOwnPropertyNames;
	const getOwnPropertySymbols = Object.getOwnPropertySymbols;
	const getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
	const getPrototypeOf = Object.getPrototypeOf;
	const objectPrototype = Object.prototype;

	export default function hoistNonReactStatics(targetComponent, sourceComponent, blacklist) {
	if (typeof sourceComponent !== 'string') { // don't hoist over string (html) components

	if (objectPrototype) {
	const inheritedComponent = getPrototypeOf(sourceComponent);
	if (inheritedComponent && inheritedComponent !== objectPrototype) {
	hoistNonReactStatics(targetComponent, inheritedComponent, blacklist);
	}
	}

	let keys = getOwnPropertyNames(sourceComponent);

	if (getOwnPropertySymbols) {
	keys = keys.concat(getOwnPropertySymbols(sourceComponent));
	}

	const targetStatics = getStatics(targetComponent);
	const sourceStatics = getStatics(sourceComponent);

	for (let i = 0; i < keys.length; ++i) {
	const key = keys[i];
	if (!KNOWN_STATICS[key] &&
	!(blacklist && blacklist[key]) &&
	!(sourceStatics && sourceStatics[key]) &&
	!(targetStatics && targetStatics[key])
	) {
	const descriptor = getOwnPropertyDescriptor(sourceComponent, key);
	try { // Avoid failures from read-only properties
	defineProperty(targetComponent, key, descriptor);
	} catch (e) {}
	}
	}
	}

	return targetComponent;
	};

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