# Contributing

## How to contribute

- File issues.
- Edit/write documentation.
- Submit pull requests.
- Test in different environments.
- Raise awareness.

## Summary of tools

Following tools are getting used:

- `TypeScript` as primary language - https://www.typescriptlang.org/
- `Jasmine` for test cases - https://jasmine.github.io/
- `Karma` for running test cases in browsers - http://karma-runner.github.io/
- `Rollup` for build - https://rollupjs.org/
- `nodejs` during development - https://nodejs.org/
- `npm` for dependency management, packaging and distribution - https://www.npmjs.com/
- `git` for version control - https://git-scm.com/

## Initial setup

Instructions on setting up development environment:

- Install `node` and `npm` - https://nodejs.org/
- Checkout code from GitHub - you may fork the code first into your GitHub account.
- Use `npm i` to install dependencies:
  ```bash
  $ npm i
  ```

## Project structure

Important files and folders:

```text
<Project Folder>
├── LICENSE
├── README.md
├── bin/                     -- Scripts invoked from `npm` tasks
├── esm6/                    -- Generated ES6 modules
├── karma.conf.js
├── package-lock.json
├── package.json
├── rabbitmq/
│   └── Dockerfile           -- This builds a docker image that is used to run test cases
├── spec/                    -- These test cases run both for nodejs (using just Jasmine) and Chrome (Jasmine/Karma)
│   ├── config/              -- Slightly different setups for nodejs and Karma
│   ├── helpers/
│   ├── support/
│   │   └── jasmine.json     -- Used only while running for nodejs
│   └── unit/                -- Test cases using Jasmine
│       └── compatibility/   -- Test cases to check compatibility mode
├── src/                     -- Typescript sources
│   └── compatibility/       -- Code for compatibility mode
├── tsconfig.json
└── rollup.config.mjs
```

## Setup a Stomp broker

- A Stomp broker is used for running the tests. I have been using RabbitMQ.
- Edit `spec/config/browser-config.js` and `spec/config/node-config.js` as per
  your setup. Defaults should work for RabbitMQ default setup on localhost.
- Please note that in RabbitMQ you will need to enable Stomp and WebStomp plugins.
- By default RabbitMQ WebStomp will treat messages as text, you will need to tell
  it to use binary frames:
  ```bash
  $ echo 'web_stomp.ws_frame = binary' >> /etc/rabbitmq/rabbitmq.conf
  ```
- A RabbitMQ Dockerfile is provided with necessary plugins and configuration. To use it, run:
  ```bash
  $ docker build -t myrabbitmq rabbitmq/ # Needed only once
  $ docker run -d -p 15674:15674 myrabbitmq # to start the broker
  ```

## Building and testing

Key npm tasks:

- clean - Remove generated built artifacts
- build-tsc - Internally used by `npm run build`
- rollup - Internally used by `npm run build`
- build - Build two variants - ES Modules and UMD
- test - Run tests in NodeJS
- karma - Rune test in browsers

### Basic development workflow

1. Checkout a new branch.
1. Make code changes (src/specs)
1. Build:
   ```bash
   $ npm run build
   ```
1. Run tests:
   - To run tests using nodejs:
     ```bash
     $ npm run test
     ```
   - To run tests using Chrome:
     ```bash
     $ npm run karma
     ```
   - _**Caution:** As both browser and nodejs use same set of test cases and same queue
     names. So, running both together may cause unexpected failures._
1. Update documentation - do update Change-log.md
1. Please follow GitHub guidelines. Raise an issue if you are unclear.