**Description:**
Helper methods were exporting twice, `_` and it's own function name.
We can map the build script to export `_` as it's own name (filename).
Therefore we export only once as `_`, and map the name on the build
script.
```js
// helpers/_foo.js
function _foo() {
// ...
}
export { _foo as _ }
```
```js
// index.js
// We know the func name will be `_foo` based on the filename.
export { _ as _foo } from '_foo.js'
```
Closes#9203
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Co-authored-by: magic-akari <akari.ccino@gmail.com>
