1 | var baseIsNative = require('./_baseIsNative'),
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2 | isMaskable = require('./_isMaskable');
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3 |
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4 | /** Error message constants. */
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5 | var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.';
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6 |
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7 | /**
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8 | * Checks if `value` is a pristine native function.
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9 | *
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10 | * **Note:** This method can't reliably detect native functions in the presence
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11 | * of the core-js package because core-js circumvents this kind of detection.
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12 | * Despite multiple requests, the core-js maintainer has made it clear: any
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13 | * attempt to fix the detection will be obstructed. As a result, we're left
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14 | * with little choice but to throw an error. Unfortunately, this also affects
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15 | * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
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16 | * which rely on core-js.
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17 | *
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18 | * @static
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19 | * @memberOf _
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20 | * @since 3.0.0
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21 | * @category Lang
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22 | * @param {*} value The value to check.
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23 | * @returns {boolean} Returns `true` if `value` is a native function,
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24 | * else `false`.
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25 | * @example
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26 | *
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27 | * _.isNative(Array.prototype.push);
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28 | * // => true
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29 | *
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30 | * _.isNative(_);
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31 | * // => false
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32 | */
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33 | function isNative(value) {
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34 | if (isMaskable(value)) {
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35 | throw new Error(CORE_ERROR_TEXT);
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36 | }
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37 | return baseIsNative(value);
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38 | }
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39 |
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40 | module.exports = isNative;
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