npm install hookified --save
This was built because we constantly wanted hooks and events extended on libraires we are building such as Keyv and Cacheable. This is a simple way to add hooks and events to your classes.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World'); //using Emittery
}
//with hooks you can pass data in and if they are subscribed via onHook they can modify the data
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
You can even pass in multiple arguments to the hooks:
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
let data2 = { some: 'data2' };
// do something
await this.hook('before:myMethod2', data, data2);
return data;
}
}
<script type="module">
import { Hookified } from 'https://cdn.jsdelivr.net/npm/hookified/dist/browser/index.js';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World'); //using Emittery
}
//with hooks you can pass data in and if they are subscribed via onHook they can modify the data
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
</script>
if you are not using ESM modules, you can use the following:
<script src="https://cdn.jsdelivr.net/npm/hookified/dist/browser/index.global.js"></script>
<script>
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World'); //using Emittery
}
//with hooks you can pass data in and if they are subscribed via onHook they can modify the data
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
</script>
If set to true, errors thrown in hooks will be thrown. If set to false, errors will be only emitted.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super({ throwHookErrors: true});
}
}
const myClass = new MyClass();
console.log(myClass.throwHookErrors); // true. because it is set in super
try {
myClass.onHook('error-event', async () => {
throw new Error('error');
});
await myClass.hook('error-event');
} catch (error) {
console.log(error.message); // error
}
myClass.throwHookErrors = false;
console.log(myClass.throwHookErrors); // false
Subscribe to a hook event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data) => {
data.some = 'new data';
});
Subscribe to a hook event once.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHookOnce('before:myMethod2', async (data) => {
data.some = 'new data';
});
myClass.myMethodWithHooks();
console.log(myClass.hooks.length); // 0
Subscribe to a hook event before all other hooks.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data) => {
data.some = 'new data';
});
myClass.preHook('before:myMethod2', async (data) => {
data.some = 'will run before new data';
});
Subscribe to a hook event before all other hooks. After it is used once it will be removed.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data) => {
data.some = 'new data';
});
myClass.preHook('before:myMethod2', async (data) => {
data.some = 'will run before new data';
});
Unsubscribe from a hook event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
const handler = async (data) => {
data.some = 'new data';
};
myClass.onHook('before:myMethod2', handler);
myClass.removeHook('before:myMethod2', handler);
Run a hook event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
in this example we are passing multiple arguments to the hook:
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
let data2 = { some: 'data2' };
// do something
await this.hook('before:myMethod2', data, data2);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data, data2) => {
data.some = 'new data';
data2.some = 'new data2';
});
await myClass.myMethodWithHooks();
Get all hooks.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data) => {
data.some = 'new data';
});
console.log(myClass.hooks);
Get all hooks for an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data) => {
data.some = 'new data';
});
console.log(myClass.getHooks('before:myMethod2'));
Clear all hooks for an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodWithHooks() Promise<any> {
let data = { some: 'data' };
// do something
await this.hook('before:myMethod2', data);
return data;
}
}
const myClass = new MyClass();
myClass.onHook('before:myMethod2', async (data) => {
data.some = 'new data';
});
myClass.clearHooks('before:myMethod2');
Subscribe to an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World');
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
Unsubscribe from an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World');
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
myClass.off('message', (message) => {
console.log(message);
});
Emit an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World');
}
}
Get all listeners for an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World');
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
console.log(myClass.listeners('message'));
Remove all listeners for an event.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World');
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
myClass.removeAllListeners('message');
Set the maximum number of listeners and will truncate if there are already too many.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
async myMethodEmittingEvent() {
this.emit('message', 'Hello World');
}
}
const myClass = new MyClass();
myClass.setMaxListeners(1);
myClass.on('message', (message) => {
console.log(message);
});
myClass.on('message', (message) => {
console.log(message);
}); // this will not be added and console warning
console.log(myClass.listenerCount('message')); // 1
Subscribe to an event once.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
}
const myClass = new MyClass();
myClass.once('message', (message) => {
console.log(message);
});
myClass.emit('message', 'Hello World');
myClass.emit('message', 'Hello World'); // this will not be called
Prepend a listener to an event. This will be called before any other listeners.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
}
const myClass = new MyClass();
myClass.prependListener('message', (message) => {
console.log(message);
});
Prepend a listener to an event once. This will be called before any other listeners.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
}
const myClass = new MyClass();
myClass.prependOnceListener('message', (message) => {
console.log(message);
});
myClass.emit('message', 'Hello World');
Get all event names.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
console.log(myClass.eventNames());
Get the count of listeners for an event or all events if evenName not provided.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
console.log(myClass.listenerCount('message')); // 1
Get all listeners for an event or all events if evenName not provided.
import { Hookified } from 'hookified';
class MyClass extends Hookified {
constructor() {
super();
}
}
const myClass = new MyClass();
myClass.on('message', (message) => {
console.log(message);
});
console.log(myClass.rawListeners('message'));
Hookified is written in TypeScript and tests are written in vitest. To run the tests, use the following command:
To setup the environment and run the tests:
npm i && npm test
To contribute follow the Contributing Guidelines and Code of Conduct.
FAQs
Event and Middleware Hooks
The npm package hookified receives a total of 301,935 weekly downloads. As such, hookified popularity was classified as popular.
We found that hookified demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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