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musix-oss/node_modules/is-arguments/index.js
2020-03-03 22:30:50 +02:00

32 lines
949 B
JavaScript

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