time-to-botec/js/node_modules/@stdlib/assert/is-class/lib/main.js
NunoSempere b6addc7f05 feat: add the node modules
Necessary in order to clearly see the squiggle hotwiring.
2022-12-03 12:44:49 +00:00

67 lines
1.5 KiB
JavaScript

/**
* @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 isFunction = require( './../../is-function' );
// VARIABLES //
var RE_CLASS = /^\s*class\s/;
// Using `Function#toString` bypasses a value's own `toString` method to provide an extra, but not security proof, precaution to prevent a provided function from impersonating a class:
var fcn2str = Function.prototype.toString;
// MAIN //
/**
* Tests if a value is a class.
*
* @param {*} value - value to test
* @returns {boolean} boolean indicating whether value is a class
*
* @example
* var bool = isClass( class Person {} );
* // returns true
*
* @example
* var bool = isClass( function Person() {} );
* // returns false
*
* @example
* var bool = isClass( null );
* // returns false
*/
function isClass( value ) {
var str;
if ( !isFunction( value ) ) {
return false;
}
str = fcn2str.call( value );
return RE_CLASS.test( str );
}
// EXPORTS //
module.exports = isClass;