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* @license Apache-2.0
*
* Copyright (c) 2018 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 proc = require( 'process' );
var getGlobal = require( '@stdlib/utils/global' );
var nativeClass = require( '@stdlib/utils/native-class' );
var isObject = require( '@stdlib/assert/is-plain-object' );
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var toStr = require( './to_string.js' );
var globalScope = require( './global_scope.js' );
// VARIABLES //
var Global = getGlobal();
var RE = /node|io\.js/;
// MAIN //
/**
* Returns a boolean indicating if the runtime is Node.js.
*
* @returns {boolean} boolean indicating if runtime is Node.js
*
* @example
* var bool = isNode();
* // returns <boolean>
*/
function isNode() {
return (
// Check for presence of `global` variable:
typeof global === 'object' &&
// Check that the `global` variable matches the determined global variable:
global === Global &&
// Check for a circular reference to the global variable:
Global === Global.global &&
// Check that the global variable has the expected internal class:
(
// Node < v7
nativeClass( Global ) === '[object global]' ||
// Node >= v7 (https://github.com/nodejs/node/issues/9274)
nativeClass( Global ) === '[object Object]'
) &&
// Check that the `global` variable is equal to the global scope:
globalScope === true &&
// Check for a `require` global variable:
typeof require === 'function' &&
// Check for a `process` global variable:
typeof proc === 'object' &&
// Check that the `process` global variable has the expected internal class (NOTE: we use `toStr`, rather than `nativecClass` to address changes introduced in Node >= v14.6.0; see https://github.com/stdlib-js/stdlib/issues/375):
toStr( proc ) === '[object process]' &&
// Check for a `versions` property:
isObject( proc.versions ) &&
// Check for a `node` property:
isString( proc.versions.node ) &&
/* eslint-disable node/no-unsupported-features/es-builtins */
(
// `process.release` was added in Node v3.0.0 via io.js:
typeof proc.release === 'undefined' ||
(
// Check for a `release` property:
isObject( proc.release ) &&
// Check for a `name` property:
isString( proc.release.name ) &&
// Check that the release name contains either `node` or `io.js` (in Node.js/io.js, the release name is read-only):
RE.test( proc.release.name )
)
)
/* eslint-enable node/no-unsupported-features/es-builtins */
);
}
// EXPORTS //
module.exports = isNode;
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