Example docker

App.re

[@bs.config {jsx: 3}];

type route =
  | Home
  | More;

let mapPathToRoute = (path: list(string)) =>
  switch (path) {
  | [] => Home
  | ["more"] => More
  | _ => Home
  };

[@react.component]
let make = () => {
  let url = ReasonReactRouter.useUrl();

  <div>
    <main>
      {switch (url.path |> mapPathToRoute) {
       | Home => <Home />
       | More => <More />
       }}
    </main>
  </div>;
};

Bsconfig.json

{
  "name": "pennyworth",
  "bsc-flags": ["-bs-no-version-header", "-bs-super-errors"],
  "ppx-flags": ["./node_modules/.bin/reactjs_jsx_ppx_v3.exe"],
  "namespace": true,
  "bs-dependencies": ["reason-react"],
  "sources": [
    {
      "dir": "app",
      "subdirs": true
    },
    {
      "dir": "server",
      "subdirs": true
    }
  ],
  "package-specs": {
    "module": "es6",
    "in-source": true
  },
  "suffix": ".bs.js",
  "refmt": 3
}

Dockerfile

FROM node:8

RUN apt-get update && apt-get install -y wget --no-install-recommends \
    && wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | apt-key add - \
    && sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list' \
    && apt-get update \
    && apt-get -y install procps \
    && apt-get -y install util-linux \
    && apt-get -y install curl \
    && apt-get -y install build-essential \
    && apt-get -y install git \
    && apt-get install -y google-chrome-unstable \
      --no-install-recommends

RUN npm install -g yarn