PowerfulMitt
Execute event prioritily, nestly, fail when previous listenser return true.At last, you can unresiger specific command by key.
Feature
...
If you can imagine any other feature, please submit a issue
Get Start
Install
npm install --save powerful-mitt
Basic Using
import {createEmitter, Emitter} from "powerful-mitt";
const emitter = createEmitter()
const FOO_COMMAND = createCommand<[string, string], void>('foo')
emitter.on(FOO_COMMAND, (obj1: string, obj2: string) => {
console.log(obj1, obj2);
})
emitter.emit(FOO_COMMAND, 'a', 'b')
Expect result
a b
Powerful Using
import {createEmitter, Emitter} from "powerful-mitt";
const emitter = createEmitter({
key: true,
priority: true,
failEmit: true,
commandNest: true
})
const FOO_COMMAND = createCommand<[string], void>('foo')
const NODE_COMMAND = createCommand<[string], void>('node')
const NODE_FOO_COMMAND = createNestCommand(NODE_COMMAND, FOO_COMMAND)
let result: string[]
const a = () => {
result.push('a')
}
const b = () => {
result.push('b')
return true
}
const c = () => {
result.push('c')
}
emitter.on(NODE_FOO_COMMAND, a, {
priority: 1,
key: 'alpha'
})
emitter.on(NODE_FOO_COMMAND, b, {
priority: 2,
key: 'beta'
})
emitter.on(NODE_FOO_COMMAND, c, {
priority: 3,
key: 'alpha'
})
No listeners executed
emitter.emit(NODE_COMMAND, '');
emitter.emit(FOO_COMMAND, '');
Expect result
result === [] // deepEqual
All listeners executed, but listener a
Because listener b executed ahead, and it return true.
emitter.emit(createNestCommand(NODE_COMMAND, ALL_COMMAND), '');
Expect result
result === ['c', 'b'] // deepEqual
After unresigster, some listeners executed
Only listener b execute.
emitter.off(NODE_FOO_COMMAND, undefined, {
key: 'alpha'
})
emitter.emit(createNestCommand(NODE_COMMAND, ALL_COMMAND), '');
Expect result
result === ['c', 'b', 'b'] // deepEqual
License
MIT License © Meogic
