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Dir : ~/usr/share/nodejs/which-typed-array/

View File Name : index.js

'use strict';

var forEach = require('for-each');
var availableTypedArrays = require('available-typed-arrays');
var callBound = require('call-bind/callBound');
var gOPD = require('gopd');

var $toString = callBound('Object.prototype.toString');
var hasToStringTag = require('has-tostringtag/shams')();

var g = typeof globalThis === 'undefined' ? global : globalThis;
var typedArrays = availableTypedArrays();

var $slice = callBound('String.prototype.slice');
var toStrTags = {};
var getPrototypeOf = Object.getPrototypeOf; // require('getprototypeof');
if (hasToStringTag && gOPD && getPrototypeOf) {
	forEach(typedArrays, function (typedArray) {
		if (typeof g[typedArray] === 'function') {
			var arr = new g[typedArray]();
			if (Symbol.toStringTag in arr) {
				var proto = getPrototypeOf(arr);
				var descriptor = gOPD(proto, Symbol.toStringTag);
				if (!descriptor) {
					var superProto = getPrototypeOf(proto);
					descriptor = gOPD(superProto, Symbol.toStringTag);
				}
				toStrTags[typedArray] = descriptor.get;
			}
		}
	});
}

var tryTypedArrays = function tryAllTypedArrays(value) {
	var foundName = false;
	forEach(toStrTags, function (getter, typedArray) {
		if (!foundName) {
			try {
				var name = getter.call(value);
				if (name === typedArray) {
					foundName = name;
				}
			} catch (e) {}
		}
	});
	return foundName;
};

var isTypedArray = require('is-typed-array');

module.exports = function whichTypedArray(value) {
	if (!isTypedArray(value)) { return false; }
	if (!hasToStringTag || !(Symbol.toStringTag in value)) { return $slice($toString(value), 8, -1); }
	return tryTypedArrays(value);
};