@sfast/pattern-emitter-ts NPM

Event emitters with support for regular expressions. Inherits from Node's EventEmitter. Written in TypeScript

Installation

You can install it with

    npm i @sfast/pattern-emitter-ts

Overview

The PatternEmitter class both extends and is backwards compatible with EventEmitter when dealing with string event types. However, when registering a listener to a RegExp, it has the added benefit of listening to all events matching the expression, rather than that particular object. In addition, it exposes a new set of methods on top of the existing API for requesting details on those patterns and their listeners. As a result, getting started with this library is as simple as replacing instances of:

import { EventEmitter } from "events"

with:

import { PatternEmitter } from "@sfast/pattern-emitter-ts";

API

Run the npm run docs command to generate a Typedoc under docs folder.

Test

Run the tests with a simple npm run test or simply npm t.

Type coverage

npm i typewiz -g
typewiz coverage tsconfig.json

// ** Jun 22 2019 
876 of 947 types are known.
Your type coverage is: 92.50%

Example

import { PatternEmitter } from "@sfast/pattern-emitter-ts";

const pe = new PatternEmitter();

pe.on("hi::1", (data) => {
    console.log(`Hi::1 ${data}`);
});

pe.on("hi::2", (data) => {
    console.log(`Hi::2 ${data}`); // this will log
});


pe.on(/^hi/, (data) => {
    console.log(`Hi::(regexp) ${data}`);  // this will log
});


pe.emit("hi::2", "data");