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mini-signals
Advanced tools
signals, in JavaScript, fast
Custom event/messaging system for TypeScript/JavaScript inspired by js-signals originally based on EventEmitter3 code base.
There are several advantages to signals over event-emitters (see Comparison between different Observer Pattern implementations). However, the current implementation of js-signals is (arguably) slow compared to other implementations (see EventsSpeedTests). mini-signals
is a fast, minimal emitter, with an API similar to js-signals.
Note: Signals here are the type defined by Miller Medeiros in js-signals inspired by AS3-Signals. They should not to be confused with SolidJS or Angular signals.
MiniSignals v2.0.0 has been rewritten in TypeScript and had it's API changed to improve performance and add type safety.
New features:
.add
now returns a weak node reference which can be used to remove the listener directly from the signal. Reduces memory leaks..add
is now type safe. The type of the listener is checked against the type variable in the constructor as well as an optional "flavor".Breaking changes:
.add
now returns a node reference instead of a object. The returned node cannot be removed directly; it must be from the signal using MiniSignal#detach
..once
has been removed. Use .add
instead with a call to .detach
in the callback.thisArg
parameter has been removed from .add
. Use .add
with a call to .bind
or (preferred) use an arrow function with a closure..dispatch
now throws an error if the signal is already dispatching.npm install mini-signals
import { MiniSignal } from 'mini-signals';
const mySignal = new MiniSignal<[string, string]>(); // the type variable is optional and defines the parameters to be dispatched
const binding = mySignal.add((foo: string, bar: string) => { // add listener, note the parameter types match the type variable in the constructor
console.log('signal dispatched');
assert(foo === 'foo');
assert(bar === 'bar');
});
mySignal.dispatch('foo', 'bar'); // dispatch signal passing custom parameters
binding.detach(); // remove a single listener
const myObject = {
foo: "bar",
updated: new MiniSignal<never>() // in this case the type variable is never, since we are not passing any parameters
};
myObject.updated.add(() => {
console.log('signal dispatched');
assert(myObject.foo === 'baz');
});
myObject.foo = 'baz';
myObject.updated.dispatch(); // dispatch signal
See API.md
Copyright (c) 2015-2023 Jayson Harshbarger
MIT License
FAQs
signals, in TypeScript, fast
The npm package mini-signals receives a total of 24,748 weekly downloads. As such, mini-signals popularity was classified as popular.
We found that mini-signals demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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