28 lines
904 B
JavaScript
28 lines
904 B
JavaScript
var $ = require('../internals/export');
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var isArray = require('../internals/is-array');
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var isFrozen = Object.isFrozen;
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var isFrozenStringArray = function (array, allowUndefined) {
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if (!isFrozen || !isArray(array) || !isFrozen(array)) return false;
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var index = 0;
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var length = array.length;
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var element;
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while (index < length) {
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element = array[index++];
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if (!(typeof element === 'string' || (allowUndefined && typeof element === 'undefined'))) {
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return false;
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}
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} return length !== 0;
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};
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// `Array.isTemplateObject` method
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// https://github.com/tc39/proposal-array-is-template-object
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$({ target: 'Array', stat: true }, {
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isTemplateObject: function isTemplateObject(value) {
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if (!isFrozenStringArray(value, true)) return false;
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var raw = value.raw;
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if (raw.length !== value.length || !isFrozenStringArray(raw, false)) return false;
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return true;
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}
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});
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