is-observable/index.js

Check if a value is an Observable

export default function isObservable(value) {
	if (!value) {
		return false;
	}

	// eslint-disable-next-line no-use-extend-native/no-use-extend-native
	if (typeof Symbol.observable === 'symbol' && typeof value[Symbol.observable] === 'function') {
		// eslint-disable-next-line no-use-extend-native/no-use-extend-native
		return value === value[Symbol.observable]();
	}

	if (typeof value['@@observable'] === 'function') {
		return value === value['@@observable']();
	}

	return false;
}