61 lines
1.7 KiB
Plaintext
61 lines
1.7 KiB
Plaintext
'use strict';
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var forEach = require('for-each');
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var availableTypedArrays = require('available-typed-arrays');
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var callBound = require('call-bind/callBound');
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var $toString = callBound('Object.prototype.toString');
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var hasToStringTag = require('has-tostringtag/shams')();
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var gOPD = require('gopd');
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var g = typeof globalThis === 'undefined' ? global : globalThis;
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var typedArrays = availableTypedArrays();
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var $indexOf = callBound('Array.prototype.indexOf', true) || function indexOf(array, value) {
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for (var i = 0; i < array.length; i += 1) {
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if (array[i] === value) {
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return i;
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}
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}
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return -1;
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};
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var $slice = callBound('String.prototype.slice');
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var toStrTags = {};
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var getPrototypeOf = Object.getPrototypeOf; // require('getprototypeof');
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if (hasToStringTag && gOPD && getPrototypeOf) {
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forEach(typedArrays, function (typedArray) {
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var arr = new g[typedArray]();
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if (Symbol.toStringTag in arr) {
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var proto = getPrototypeOf(arr);
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var descriptor = gOPD(proto, Symbol.toStringTag);
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if (!descriptor) {
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var superProto = getPrototypeOf(proto);
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descriptor = gOPD(superProto, Symbol.toStringTag);
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}
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toStrTags[typedArray] = descriptor.get;
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}
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});
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}
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var tryTypedArrays = function tryAllTypedArrays(value) {
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var anyTrue = false;
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forEach(toStrTags, function (getter, typedArray) {
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if (!anyTrue) {
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try {
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anyTrue = getter.call(value) === typedArray;
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} catch (e) { /**/ }
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}
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});
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return anyTrue;
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};
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module.exports = function isTypedArray(value) {
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if (!value || typeof value !== 'object') { return false; }
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if (!hasToStringTag || !(Symbol.toStringTag in value)) {
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var tag = $slice($toString(value), 8, -1);
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return $indexOf(typedArrays, tag) > -1;
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}
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if (!gOPD) { return false; }
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return tryTypedArrays(value);
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};
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