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babel7 @babel/preset-env 不指定配置项, 是默认将es6+转换成es5吗?

babel-preset-env

我要求兼容低端手机, 即es-2015这个标准.
是不是直接设置为 babel-preset-env, 则默认相当于es-2015

  gulp.src('js/*.js')    

    .pipe(babel({
        presets: ['@babel/preset-env']  // 没有其他配置项
    }))

???


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image.png
另外
image.png
最好设置下target,减下不必的转换,提升编译速度


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