40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
var baseIsNative = require('./_baseIsNative'),
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isMaskable = require('./_isMaskable');
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/** Error message constants. */
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var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.';
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/**
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* Checks if `value` is a pristine native function.
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*
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* **Note:** This method can't reliably detect native functions in the presence
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* of the core-js package because core-js circumvents this kind of detection.
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* Despite multiple requests, the core-js maintainer has made it clear: any
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* attempt to fix the detection will be obstructed. As a result, we're left
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* with little choice but to throw an error. Unfortunately, this also affects
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* packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
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* which rely on core-js.
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*
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* @static
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* @memberOf _
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* @since 3.0.0
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a native function,
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* else `false`.
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* @example
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*
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* _.isNative(Array.prototype.push);
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* // => true
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*
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* _.isNative(_);
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* // => false
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*/
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function isNative(value) {
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if (isMaskable(value)) {
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throw new Error(CORE_ERROR_TEXT);
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}
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return baseIsNative(value);
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}
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module.exports = isNative;
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