all files / popper/utils/ isNative.js

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const nativeHints = [
    'native code',
    '[object MutationObserverConstructor]' // for mobile safari iOS 9.0
];
 
/**
 * Determine if a function is implemented natively (as opposed to a polyfill).
 * @argument {Function | undefined} fn the function to check
 * @returns {boolean}
 */
export default fn => nativeHints.some(hint => (fn || '').toString().indexOf(hint) > -1);