What's new in release 7

November 18, 2019

The new major version of BuckleScript is coming -7.0.0-dev.1 released for testing!

We are maintaining 5.* and 6.* for OCaml 4.02 and 4.06 for a while, since this release we are moving forward and focusing on release 7.* (for OCaml 4.06).

This is a major release comes with lots of nice features listed here.

We talk about some highlights here

  • refmt upgraded to latest, it comes with better error message

  • OCaml Records compiled into JS objects

This is one of the most desired features, it is finally landed.

See the generated code below for excitement!

type t = {
  x: int,
  y: int,
  z: int,
};

let obj = {x: 3, y: 2, z: 2};

let obj2 = {...obj, y: 4};

type t = {
  x : int;
  y : int;
  z : int 
}

let obj = { x = 3 ; y = 2; z = 2}

let obj2 = { obj with y = 4}

var obj2 = {
  x: 3,
  y: 4,
  z: 2
};

var obj = {
  x: 3,
  y: 2,
  z: 2
};

This new change makes record much more useful and its interaction with private type; unboxed option type will make interop with JS much nicer!

As always, we continue improving our optimizer in various commits, we belive that not only a better language but also an implementation of high quality is key to push typed functional programming into industry.

Happy hacking!

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