无效，还是一样会添加'use strict';

我的配置如下：
```javascript
var removeUseStrict = require("gulp-remove-use-strict");

// 压缩js文件
gulp.task('minify-js', function (done) {
return gulp.src(['./public/**/*.js', '!./public/**/*.min.js'])
.pipe(babel({
//将ES6代码转译为可执行的JS代码
presets: ['es2015'] // es5检查机制
}))
.pipe(uglify())
.pipe(removeUseStrict()) //取消严格模式方法("use strict")
.pipe(gulp.dest('./public'));
done();
});
```

Reproduce the reported behavior with the shown gulp task and its Babel, Uglify, and removeUseStrict pipeline. Inspect the generated files under public/ and compare the output before and after removeUseStrict; the work is done when the generated JavaScript no longer contains the unwanted 'use strict' directive.

Written by the indexing model from the issue text.