45 lines
1.1 KiB
JavaScript
45 lines
1.1 KiB
JavaScript
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'use strict';
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var hasToStringTag = require('has-tostringtag/shams')();
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var callBound = require('call-bound');
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var $toString = callBound('Object.prototype.toString');
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/** @type {import('.')} */
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var isStandardArguments = function isArguments(value) {
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if (
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hasToStringTag
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&& value
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&& typeof value === 'object'
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&& Symbol.toStringTag in value
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) {
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return false;
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}
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return $toString(value) === '[object Arguments]';
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};
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/** @type {import('.')} */
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var isLegacyArguments = function isArguments(value) {
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if (isStandardArguments(value)) {
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return true;
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}
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return value !== null
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&& typeof value === 'object'
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&& 'length' in value
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&& typeof value.length === 'number'
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&& value.length >= 0
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&& $toString(value) !== '[object Array]'
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&& 'callee' in value
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&& $toString(value.callee) === '[object Function]';
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};
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var supportsStandardArguments = (function () {
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return isStandardArguments(arguments);
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}());
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// @ts-expect-error TODO make this not error
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isStandardArguments.isLegacyArguments = isLegacyArguments; // for tests
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/** @type {import('.')} */
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module.exports = supportsStandardArguments ? isStandardArguments : isLegacyArguments;
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