我最近将babel添加到了gulpfile中，以便可以开始在ES6中编写代码。该代码正在按预期进行编译，但是我注意到以下代码行已在多个位置添加到已编译的JS文件中。我认为我不需要它，因此想删除它：
var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
我尝试过的事情：
在gulpfile.babel.js的{{1}}内部，我像这样设置createBuildTask()：presets
...导致在gulp构建期间返回以下错误：
'presets': [['env',{'exclude': ['transform-typeof-symbol']}]]
这是删除的正确方法，还是应该以其他方式处理？下面，我包括了Invalid Option: The plugins/built-ins 'transform-typeof-symbol' passed to the 'exclude' option are not valid. Please check data/[plugin-features|built-in-features].js in babel-preset-env和package.json的相关部分。
package.json （包括 dev ， devDependencies ）
gulpfile.babel.jsgulpfile.babel.js
"devDependencies": {
"babel-core": "^6.26.3","babel-eslint": "^7.2.3","babel-preset-env": "^1.7.0","babel-register": "^6.26.0","del": "^2.2.2","eslint": "^6.6.0","gulp": "^4.0.2","gulp-babel": "^7.0.1","gulp-concat": "^2.6.1","gulp-eslint": "^6.0.0","gulp-rename": "^1.2.2","gulp-terser": "^1.2.0"
},"dependencies": {
"babel-plugin-transform-remove-strict-mode": "0.0.2","babel-polyfill": "^6.26.0","lodash": "^4.17.15"
}