_baseIsNative.js
f40d8f152a93drf-api-tracking

_baseIsNative.js
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			var isFunction = require('./isFunction'),
			isMasked = require('./_isMasked'),
			isObject = require('./isObject'),
			toSource = require('./_toSource');

			/**
			* Used to match `RegExp`
			* [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
			*/
			var reRegExpChar = /[\\^$.*+?()[\]{}\|]/g;

			/** Used to detect host constructors (Safari). */
			var reIsHostCtor = /^\[object .+?Constructor\]$/;

			/** Used for built-in method references. */
			var funcProto = Function.prototype,
			objectProto = Object.prototype;

			/** Used to resolve the decompiled source of functions. */
			var funcToString = funcProto.toString;

			/** Used to check objects for own properties. */
			var hasOwnProperty = objectProto.hasOwnProperty;

			/** Used to detect if a method is native. */
			var reIsNative = RegExp('^' +
			funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
			.replace(/hasOwnProperty\|(function).?(?=\\\()\| for .+?(?=\\\])/g, '$1.?') + '$'
			);

			/**
			* The base implementation of `_.isNative` without bad shim checks.
			*
			* @private
			* @param {*} value The value to check.
			* @returns {boolean} Returns `true` if `value` is a native function,
			* else `false`.
			*/
			function baseIsNative(value) {
			if (!isObject(value) \|\| isMasked(value)) {
			return false;
			}
			var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
			return pattern.test(toSource(value));
			}

			module.exports = baseIsNative;