84 lines
2.1 KiB
JavaScript
84 lines
2.1 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isBoolean = require( '@stdlib/assert-is-boolean' ).isPrimitive;
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var format = require( '@stdlib/string-format' );
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var getThis = require( './codegen.js' );
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var Self = require( './self.js' );
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var Win = require( './window.js' );
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var Global = require( './global.js' );
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var GlobalThis = require( './global_this.js' );
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// MAIN //
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/**
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* Returns the global object.
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*
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* ## Notes
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*
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* - Using code generation is the **most** reliable way to resolve the global object; however, doing so is likely to violate content security policies (CSPs) in, e.g., Chrome Apps and elsewhere.
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*
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* @param {boolean} [codegen=false] - boolean indicating whether to use code generation to resolve the global object
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* @throws {TypeError} must provide a boolean
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* @throws {Error} unable to resolve global object
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* @returns {Object} global object
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*
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* @example
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* var g = getGlobal();
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* // returns {...}
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*/
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function getGlobal( codegen ) {
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if ( arguments.length ) {
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if ( !isBoolean( codegen ) ) {
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throw new TypeError( format( 'invalid argument. Must provide a boolean. Value: `%s`.', codegen ) );
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}
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if ( codegen ) {
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return getThis();
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}
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// Fall through...
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}
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// Case: 2020 revision of ECMAScript standard
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if ( GlobalThis ) {
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return GlobalThis;
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}
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// Case: browsers and web workers
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if ( Self ) {
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return Self;
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}
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// Case: browsers
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if ( Win ) {
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return Win;
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}
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// Case: Node.js
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if ( Global ) {
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return Global;
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}
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// Case: unknown
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throw new Error( 'unexpected error. Unable to resolve global object.' );
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}
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// EXPORTS //
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module.exports = getGlobal;
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