source: imaps-frontend/node_modules/is-data-view/index.js@ 79a0317

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $ArrayBuffer = GetIntrinsic('%ArrayBuffer%');
var $DataView = GetIntrinsic('%DataView%', true);

var callBound = require('call-bound');

// node <= 0.10, < 0.11.4 has a nonconfigurable own property instead of a prototype getter
var $dataViewBuffer = callBound('DataView.prototype.buffer', true);

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

/** @type {import('.')} */
module.exports = function isDataView(x) {
        if (!x || typeof x !== 'object' || !$DataView || isTypedArray(x)) {
                return false;
        }

        if ($dataViewBuffer) {
                try {
                        $dataViewBuffer(x);
                        return true;
                } catch (e) {
                        return false;
                }
        }

        if (
                ('getInt8' in x)
                        && typeof x.getInt8 === 'function'
                        && x.getInt8 === new $DataView(new $ArrayBuffer(1)).getInt8
        ) {
                return true;
        }

        return false;
};