closure-builder
Version:
Simple Closure, Soy and JavaScript Build system
53 lines (45 loc) • 1.55 kB
JavaScript
/**
* @fileoverview Closure Builder - Sniffer Tools
*
* @license Copyright 2018 Google Inc. All Rights Reserved.
*
* 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.
*
* @author mbordihn@google.com (Markus Bordihn)
*/
/**
* File tools.
* @constructor
* @struct
* @final
*/
let SnifferTools = function() {};
/**
* @param {!string} content
* @return {!string}
*/
SnifferTools.getECMAScriptVersion = function(content) {
if (content.includes(' await ') || content.includes('async function') ||
content.includes('.padStart(') || content.includes('.padEnd(') ||
content.includes('Object.getOwnPropertyDescriptors(') ||
content.includes('Object.getPrototypeOf(async function(){}).construct') ||
/\w+\.values\(/.test(content) || /\w+\.entries\(/.test(content)) {
return 'ECMASCRIPT_2017';
} else if (/\w+\.includes\(/.test(content)) {
return 'ECMASCRIPT_2016';
} else if (/(let|const)\s+\w+\s?=/.test(content)) {
return 'ECMASCRIPT_2015';
}
return '';
};
module.exports = SnifferTools;