69 lines
1.7 KiB
JavaScript
69 lines
1.7 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 getPrototypeOf = require( '@stdlib/utils/get-prototype-of' );
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var typeOf = require( '@stdlib/utils/type-of' );
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var isError = require( './../../is-error' );
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// MAIN //
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/**
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* Tests if a value is a `SyntaxError` object.
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*
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* @param {*} value - value to test
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* @returns {boolean} boolean indicating whether a value is a `SyntaxError` object
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*
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* @example
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* var bool = isSyntaxError( new SyntaxError( 'beep' ) );
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* // returns true
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*
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* @example
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* var bool = isSyntaxError( {} );
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* // returns false
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*/
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function isSyntaxError( value ) {
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if ( typeof value !== 'object' || value === null ) {
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return false;
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}
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// Check for `SyntaxError` objects from the same realm (same Node.js `vm` or same `Window` object)...
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if ( value instanceof SyntaxError ) {
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return true;
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}
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// All `SyntaxError` objects are `Error` objects...
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if ( isError( value ) ) {
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// Walk the prototype tree until we find the desired constructor...
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while ( value ) {
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if ( typeOf( value ) === 'syntaxerror' ) {
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return true;
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}
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value = getPrototypeOf( value );
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}
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}
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return false;
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}
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// EXPORTS //
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module.exports = isSyntaxError;
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