Can't this be done using |> instead?

[imranismail]

No description provided.

[miraks]

Unfortunately, no. Constructions like this

a |> b

will give syntax error in JavaScript. It will be possible if Babel team provide API for parser plugins, but I don't know if they're planning to do that.

[Swizz]

To avoid syntax error, Babel seem to use two kinds of plugins : syntax and transform.

I think syntax allow the parser to work well with non standard syntax.
And transform, made the new syntax to JS one.

More informations.

[miraks]

Yes, but API for parser (syntax) plugins isn't public and really poor. Actually babels "official" syntax plugins are hardcoded into babylon. For example, function bind syntax plugin: plugin code and babylon check.

[Swizz]

Oh.
I am just starting with Babel plugins.

So, the best way is to play with mrapogee/babel-plugin-syntax-pipeline-operator and mrapogee/babel-plugin-transform-pipeline-operator and to made a PR on babel/babylon to work well with the pipelineOperator option ?

Someone is interested about this functionality or this one work well for your needs ?

( cc @mrapogee )

[miraks]

Looks like there's already been PR from @mrapogee but it never was merged.

[Swizz]

Oh. Got it !
Thanks for all your answers.

[samdesota]

Hey all,

I was playing around with this a few months ago and I forked babel to get this working on my setup, but the PR and code referenced above is actually from @mindeavor

I did make babylon branch mrapogee/babylon/tree/feature-pipeline that adds the pipeline operator to the syntax. If you get babel-core to import the source from that branch, you may be able to compile the pipeline operator if you include babel-plugin-transform-pipeline-operator in your .babelrc, though I haven't fully tested.

[Swizz]

I want to keep my hands on the official babylon.

This plugin works well, and finally the | operator is sweet.
I do not need bitwise operators in javascript.

---

But.. In the esnext proposal about pipeline, @mindeavor works with currying.

So ...

let result = "hello"
  |> doubleSay

become

let result = doubleSay("hello")

---

Here, you choose to unshift it in the arguments array like Elm.

So ...

let result = "hello"
  |> doubleSay(null)

become

let result = doubleSay("hello", null)

---

I think currying is a better way to do that stuff.
I will work on an alternative which implements currying stuffs.