@t8/event-patterns

Lightweight zero-dependency event emitter with flexible event type matching

Installation: npm i @t8/event-patterns

Usage

Initialization:

import { EventEmitter } from "@t8/event-patterns";

let eventEmitter = new EventEmitter();

Adding a handler of a specific event type:

eventEmitter.on("task started", event => {
  console.log(event);
});

Of all events matching the pattern:

eventEmitter.on(/^task\s/, event => {
  console.log(event);
});

With captured parameters:

eventEmitter.on(/^(\S+)\s(?<status>.*)$/, event => {
  console.log(event.params[0], event.params.status);
});

Adding a handler of all events dispatched to the eventEmitter instance:

let listener = eventEmitter.on("*", event => {
  console.log(event);
});

Dispatching an event of a specific type and properties:

eventEmitter.emit("task started", { x: 42 });

Removing a previously declared listener:

listener.remove();