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Developer Notes

Getting started with NATS.ws for contributions requires a little preparation:

  • A recent NATS server that supports WebSockets
  • An HTTP server to serve HTML and the nats.ws library

To make it easy, the nats.ws GitHub repository aids you with this setup. If you are on Windows, you'll need to look at the package.json for hints on what to do. Better yet, contribute an alternate package.json.

Here are the steps:

# clone the nats.ws repository:
git clone https://github.com/nats-io/nats.ws.git

# install [deno](https://deno.land)
# on windows do `npm run setup_win`
npm run setup

# build the library
npm run build

# OPTIONAL
# install the master of nats-server, if you have 
# [Go](https://golang.org/doc/install) installed,
# you can easily clone and build the latest from
# master - you only need to do this if you want
# run a server from master.
npm run install-ns

# must have a nats-server installed
# start a nats-server:
npm run start-nats

# start an http server to serve the content in
# the examples directory:
npm run start-http

# point your browser to: http://localhost:4507/examples
# click on one of the HTML files

Getting started with nats.ws

A simple screencast introduction to nats.ws

react screencast

Working with react-create-app?

The transpilation process seems to not pick up on the right library for nats.ws. To work around the issue, simple insure you import from the cjs file directly:

import { connect } from "../node_modules/nats.ws/cjs/nats.js";

A simple screencast introduction to nats.ws viewed React can be found here:

react screencast

Older Typescript Compiler?

If you are using an older version of the typescript compiler (for example, if you on Angular 8), then simply add this to your tsconfig.json file:

{
  "compilerOptions": {
    "paths": {
      "nkeys.js": [
        "node_modules/nkeys.js/nkeys.mjs",
        "node_modules/nkeys.js/lib/nkeys.d.ts"
      ],
      "nats.ws": [
        "node_modules/nats.ws/cjs/nats.js",
        "node_modules/nats.ws/lib/src/mod.d.ts"
      ]
    }
  }
}