unemit

Minimal event emitter

Usage

const unemit = require("unemit");

const emitter = unemit();

const unsubscribe = emitter.on("type", data => {
  console.log(data);
});

emitter.emit("type", { foo: "bar" });

unemit()

Returns an Emitter object

Emitter.emit(type, event)

Emits an event of type type. Will call the handlers with handler(event).

Emitter.on(type, handler)

Registers a handler for events of type type. Returns a function that removes the handler.

const unsubscribe = emitter.on("type", handler);

unsubscribe();

Unlike other libraries, unevent will prevent registering the same handler twice for the same event type.

Emitter.off(type, handler)

Removes a handler from events of type type.

Emitter.once(type, handler)

Registers a handler for only the first event of type type. It's equivalent to:

function handler() {
  emitter.off("type", handler);
}
emitter.on("type", handler);

Credits

This library was inspired by mitt.