⚡️ WebTopics

Typed pub / sub, request / responses for web apps using Socket.io and Zod, inspired by ROS.

Documentation (https://shiukaheng.github.io/WebTopics/)

Features

Typed and validated topics and services via Zod

const SensorTopic = createTopic("sensor", z.object({
  "temperature": z.number(),
  "humidity": z.number()
}))
client.pub(SensorTopic, {temperature: 20, humidity: "50%"}) // Error: Expected number, received string

Collaborative topics

client1.pub(channel, {a: "1"})
client2.pub(channel, {b: "2"}) // New state merged on old by default
client3.sub(channel, (value) => {
  console.log(value) // {a: "1", b: "2"}
})
client2.pub(channel, {b: "2"}, true) // Or publishing as an overwrite
// client 3 receives: {b: "2"}

Async service calls

const AdditionService = createService("add", 
  // Request schema
  z.object({
    "a": z.number(),
    "b": z.number()
  }), 
  // Response schema
  z.number()
)
...

// Call service
const result = await client.req(AdditionService, someClientID, {a: 1, b: 2}) // Promise<number>

Packagable channels for easy sharing between client and server

export const AdditionService = createService("add", 
  z.object({
    "a": z.number(),
    "b": z.number()
  }), 
  z.number()
)

export const SensorTopic = createTopic("sensor", z.object({
  "temperature": z.number(),
  "humidity": z.number()
}))
...

// Client and server can share the same channels from an external package
import {AdditionService, SensorTopic} from "channels"