exactProp.js
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	import _extends from "@babel/runtime/helpers/esm/extends";
	// This module is based on https://github.com/airbnb/prop-types-exact repository.
	// However, in order to reduce the number of dependencies and to remove some extra safe checks
	// the module was forked.

	const specialProperty = 'exact-prop: \u200b';
	export default function exactProp(propTypes) {
	if (process.env.NODE_ENV === 'production') {
	return propTypes;
	}
	return _extends({}, propTypes, {
	[specialProperty]: props => {
	const unsupportedProps = Object.keys(props).filter(prop => !propTypes.hasOwnProperty(prop));
	if (unsupportedProps.length > 0) {
	return new Error(`The following props are not supported: ${unsupportedProps.map(prop => `\`${prop}\``).join(', ')}. Please remove them.`);
	}
	return null;
	}
	});
	}