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* @license Apache-2.0
*
* Copyright (c) 2021 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var IS_BROWSER = require( '@stdlib/assert/is-browser' );
var getGlobal = require( '@stdlib/utils/global' );
// VARIABLES //
var Global = getGlobal();
// MAIN //
/**
* Returns a boolean indicating if an environment is a touch device.
*
* @private
* @returns {boolean} boolean indicating if an environment is a touch-enabled environment
*/
function isTouchDevice() {
if ( !IS_BROWSER ) {
return false;
}
return !!(
'ontouchstart' in Global ||
(
Global.DocumentTouch &&
Global.document &&
Global.document instanceof Global.DocumentTouch
) ||
(
Global.navigator &&
(
Global.navigator.maxTouchPoints > 0 ||
Global.navigator.msMaxTouchPoints > 0
)
)
);
}
// EXPORTS //
module.exports = isTouchDevice;
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