Champion: @littledan
Spec Repo: https://github.com/tc39/proposal-pipeline-operator
First presented at Sept 2017 meeting: https://github.com/tc39/agendas/blob/master/2017/09.md
Slides: https://docs.google.com/presentation/d/1qiWFzi5dkjuUVGcFXwypuQbEbZk-BV7unX0bYurcQsA/edit#slide=id.p
Related proposal: Partial Application https://github.com/rbuckton/proposal-partial-application by @rbuckton
Related proposal: Function Bind Operator https://github.com/tc39/proposal-bind-operator

Basic Example

Input

let result = "hello"
  |> doubleSay
  |> capitalize
  |> exclaim;
result //=> "Hello, hello!"

Output

let result = exclaim(capitalize(doubleSay("hello")));
result //=> "Hello, hello!"

Initial Implementation (would need updating to v7)

• Initial Spec PR by @littledan Add a specification tc39/proposal-pipeline-operator#51

Old/Alternative Implementations

• Old PR to Babel: New plugin for pipeline operator proposal babel#3159
• https://github.com/SuperPaintman/babel-plugin-transform-pipeline
• << and >>: https://github.com/michaelmitchell/babel-plugin-pipe-composition

cc @gilbert, @SuperPaintman

Implementation

• Parser PR: Pipeline Operator proposal babylon#742
• Transform PR: Pipeline operator babel#6335
• Feedback around relating Pipeline Operator, Function Bind, Partial Application