chore: dockerize development environment (#1308)

Author: millotp

.dockerignore

@@ -0,0 +1,2 @@
+**/node_modules
+**/.DS_Store

CONTRIBUTING.md

@@ -69,6 +69,12 @@ _Note that no new features will be developed or backported for the `vX` branches
 
 ## Requirements
 
+### Docker
+
+If you don't want to install dependencies on your host machine, you can follow this [guide](https://github.com/algolia/algoliasearch-client-javascript/blob/master/DOCKER_README.MD) to run code inside a docker container but keep the source files on your favorite IDE.
+
+### Host machine
+
 To run this project, you will need:
 
 - Node.js ≥ 12 (current stable version) – [nvm](https://github.com/creationix/nvm#install-script) is recommended

DOCKER_README.MD

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+In this page you will find our recommended way of installing Docker on your machine. 
+This guide is made for macOS users.
+
+## Install docker
+
+Install [Docker Desktop](https://docs.docker.com/get-docker/).
+
+## Build the image
+
+```bash
+docker build -t algolia-js --build-arg NODE_IMAGE=node:$(cat .nvmrc)-alpine .
+```
+
+## Run the image
+
+You need to provide few environment variables at runtime to be able to run the [Common Test Suite](https://github.com/algolia/algoliasearch-client-specs/tree/master/common-test-suite).
+You can set them up directly in the command:
+
+```bash
+docker run -it --rm --env ALGOLIA_APP_ID=XXXXXX [...] -v $PWD:/app -v /app/node_modules -w /app algolia-js bash
+```
+
+However, we advise you to export them in your `.bashrc` or `.zshrc`. That way, you can use [Docker's shorten syntax](https://docs.docker.com/engine/reference/commandline/run/#set-environment-variables--e---env---env-file) to set your variables.
+
+```bash
+### This is needed only to run the full test suite
+docker run -it --rm --env ALGOLIA_APPLICATION_ID_1 \
+                    --env ALGOLIA_ADMIN_KEY_1 \
+                    --env ALGOLIA_SEARCH_KEY_1 \
+                    --env ALGOLIA_APPLICATION_ID_2 \
+                    --env ALGOLIA_ADMIN_KEY_2 \
+                    --env ALGOLIA_APPLICATION_ID_MCM \
+                    --env ALGOLIA_ADMIN_KEY_MCM \
+-v $PWD:/app -v /app/node_modules -w /app algolia-js bash
+```
+
+Once your container is running, any changes you make in your IDE are directly reflected in the container, except for the `node_modules` folder.  
+If you want to add or remove packages, you will have to rebuild the image, this is because the `node_modules` folder is installed in a different folder to improve performance.
+
+To launch the tests, you can use one of the following commands
+```shell script
+# run only the unit tests
+yarn test:unit
+
+# run a single test
+yarn test:unit nameOfYourTest
+```
+
+You can find more commands in the `package.json` file.
+
+Feel free to contact us if you have any questions.

Dockerfile

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+# Dockerfile
+ARG NODE_IMAGE=node:12.16.0-alpine
+
+FROM $NODE_IMAGE
+
+# Install the dependencies in the parent folder so they don't get overriden by the bind mount
+WORKDIR /
+
+# We need to install some dependencies for bundlesize (https://github.com/siddharthkp/bundlesize/pull/370)
+RUN apk add --no-cache bash python3 make g++
+
+COPY package.json yarn.lock ./
+
+RUN yarn install
+
+ENV NODE_PATH=/node_modules
+ENV PATH=/node_modules/.bin:$PATH
+
+WORKDIR /app
+COPY . ./