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97 lines
2.5 KiB
Markdown
97 lines
2.5 KiB
Markdown
[](https://travis-ci.org/DirtyHairy/microevent)
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[](https://badge.fury.io/js/microevent.ts)
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# What is it?
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This package implements an event system with minimal dispatch overhead. Instead
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of recording handlers bound to an event in dynamic data structures, this library
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binds the handlers to autogenerated code. This enables the VM to inline the
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handler invocation and generate code that is just as fast as invoking the handlers
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directly.
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In a (completely unscientific) benchmark, this library performs bettern than
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NodeJS events in terms of event dispatch calls per second by about two orders
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of magnitude.
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# How to use it?
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## Installation
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You can install the library into your project via npm
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npm install microevent.ts
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The library is written in Typescript and will work in any environment that
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supports ES5. No external typings are required for using this library with
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Typescript (version >= 2).
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## Importing
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ES5 / CommonJS
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var Event = require('microevent.ts').Event;
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ES6
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import {Event} from 'microevent.ts';
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Typescript
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import {Event, EventInterface} from 'microevent.ts';
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The `EventInterface` covers only the client side of an event, that is adding
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and removing handlers.
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## API
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### Creating
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ES5/ES6
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const event = new Event();
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Typescript
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const event = new Event<PayloadT>();
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Create a new event that will dispatch a payload of type `PayloadT`.
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### Dispatching
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event.dispatch(payload);
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This will call all handlers in the order they were registered, passing `payload`
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as first argument.
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**IMPORTANT** `dispatch` is a property that refers to dynamically generated code.
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**DO NOT KEEP ANY REFERENCES** to `dispatch` as adding and removing handlers
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will invalidate them.
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### Registering handlers
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event.addHandler(handler, context);
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`context` is an optional parameter that will be passed to the handler on
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each invocation.
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### Removing handlers
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event.removeHandler(handler, context);
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Both `handler` and `context` must be identical to the values used when registering
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the handler in the first place.
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### Checking for handlers
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event.isHandlerAttached(handler, context)
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This will check whether a handler was attached in a given context.
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event.hasHandlers
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`true` if the event has any handlers attached, false otherwise.
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# License
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Feel free to use this library under the conditions of the MIT license.
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