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At work, I just spent the last few weeks exploring and evaluating every format I could find, and my number one criteria was whether they supported sum types. I was especially interested in schema languages in which I could describe my types and then some standard specifies how to encode them using an on-the-wire format, usually JSON.

1. Swagger represents sum types like Scala does, using subtyping. So you have a parent type EitherIntString with two subtypes Left and Right represented as {"discriminator": "Left", value: 42} and {"discriminator": "Right", value": "foo"}. Unfortunately, unlike in Scala in which the parent type is abstract and cannot be instantiated, in Swagger it looks like the parent type is concrete, so when you specify that your input is an EitherIntString, you might receive {"discriminator": "EitherIntString"} instead of one of its two subtypes.
2. JSON-schema supports unions, which isn't quite the same thing as sum types because

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title	author
Glassery	Oleg Grenrus

After I have improved the raw performance of optika – a JavaScript optics library, it's time to make the library (feature-)complete and sound. Gathering and classifying all possible optic types, gives us a reference point

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module MemCache = {
  type t;

  [@bs.deriving abstract]
  type config = {initialState: Js.Json.t};

  type conf = Js.Json.t;

  [@bs.module "graphql-hooks-memcache"]
  external _createMemCache: config => t = "default";

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/* Use Reason's ability to define recursive types with the `and` keyword */
type movie = {
  id: option(string),
  name: option(string),
  rating: option(Js.null(string)),
  runTime: option(Js.null(int)),
  actors: option(list(actor)),
}
and actor = {
  id: option(string),

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module StringContext =
  Context.MakePair({
    type t = string;
    let defaultValue = "Awesome";
  });

let component = ReasonReact.statelessComponent("Tree");

let make = _children => {

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FROM ocaml/opam2:alpine-3.7-ocaml-4.06
RUN sudo apk --no-cache add ca-certificates
RUN sudo apk add --update m4 openssh-client

# Setup SSH.
RUN mkdir -p ~/.ssh
ARG SSH_PRIVATE_KEY
RUN echo "${SSH_PRIVATE_KEY}" > ~/.ssh/id_rsa
RUN chmod 600 ~/.ssh/id_rsa
RUN printf "Host github.com\n\tStrictHostKeyChecking no\n" > ~/.ssh/config

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pre-install-commands:
  ["opam-bin-cache.sh" "restore" build-id name] {?build-id}
wrap-build-commands: [
  ["opam-bin-cache.sh" "wrap" build-id] {?build-id}
  ["%{hooks}%/sandbox.sh" "build"] {os = "linux"}
]
wrap-install-commands: [
  ["opam-bin-cache.sh" "wrap" build-id] {?build-id}
  ["%{hooks}%/sandbox.sh" "install"] {os = "linux"}
]