32 lines
949 B
JavaScript
32 lines
949 B
JavaScript
'use strict';
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var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
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var toStr = Object.prototype.toString;
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var isStandardArguments = function isArguments(value) {
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if (hasToStringTag && value && typeof value === 'object' && Symbol.toStringTag in value) {
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return false;
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}
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return toStr.call(value) === '[object Arguments]';
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};
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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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typeof value.length === 'number' &&
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value.length >= 0 &&
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toStr.call(value) !== '[object Array]' &&
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toStr.call(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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isStandardArguments.isLegacyArguments = isLegacyArguments; // for tests
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module.exports = supportsStandardArguments ? isStandardArguments : isLegacyArguments;
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