Unlock 30% off on Manual Testing Annual Plans this Holiday Season. 
Use Code: LCMYEARENDEXCL30
Use Code: LCMYEARENDEXCL30Check icon
Copied to Clipboard!
How to use listenerCount method in storybook-root
Best JavaScript code snippet using storybook-root
event.test.ts
Source:event.test.ts 
...3 test('æ å½å空é´', () => {4 const { on, listenerCount } = useEvent()5 const event = 'event'6 const handler = () => {}7 expect(listenerCount()).toBe(0)8 on(event, handler)9 expect(listenerCount()).toBe(1)10 expect(listenerCount()).toEqual(listenerCount(event))11 })12 test('带1ä¸ä¸ªå½å空é´', () => {13 const { on, listenerCount } = useEvent()14 const event = 'event.ns'15 const handler = () => {}16 expect(listenerCount()).toBe(0)17 on(event, handler)18 expect(listenerCount()).toBe(1)19 expect(listenerCount()).toEqual(listenerCount(event))20 })21 test('带大äº1ä¸ä¸ªå½å空é´', () => {22 const { on, listenerCount } = useEvent()23 const event = 'event'24 const events = `${event}.ns.ns2`25 const handler = () => {}26 expect(listenerCount()).toBe(0)27 on(events, handler)28 expect(listenerCount()).toBe(2)29 expect(listenerCount()).toEqual(listenerCount(event))30 })31})32describe('éå¤è®¢é
-ç¸åäºä»¶å¤çå¨', () => {33 test('æ å½å空é´', () => {34 const { on, listenerCount } = useEvent()35 const event = 'event'36 const handler = () => {}37 expect(listenerCount()).toBe(0)38 on(event, handler)39 on(event, handler)40 expect(listenerCount()).toBe(1)41 expect(listenerCount()).toEqual(listenerCount(event))42 })43 test('带1ä¸ä¸ªå½å空é´', () => {44 const { on, listenerCount } = useEvent()45 const event = 'event.ns'46 const handler = () => {}47 expect(listenerCount()).toBe(0)48 on(event, handler)49 on(event, handler)50 expect(listenerCount()).toBe(1)51 expect(listenerCount()).toEqual(listenerCount(event))52 })53 test('带大äº1ä¸ä¸ªå½å空é´', () => {54 const { on, listenerCount } = useEvent()55 const event = 'event.ns.ns2'56 const handler = () => {}57 expect(listenerCount()).toBe(0)58 on(event, handler)59 on(event, handler)60 expect(listenerCount()).toBe(2)61 expect(listenerCount()).toEqual(listenerCount(event))62 })63})64describe('éå¤è®¢é
-ä¸åäºä»¶å¤çå¨', () => {65 test('æ å½å空é´', () => {66 const { on, listenerCount } = useEvent()67 const event = 'event'68 const handler = () => {}69 const handler2 = () => {}70 expect(listenerCount()).toBe(0)71 on(event, handler)72 on(event, handler2)73 expect(listenerCount()).toBe(2)74 expect(listenerCount()).toEqual(listenerCount(event))75 })76 test('带1ä¸ä¸ªå½å空é´', () => {77 const { on, listenerCount } = useEvent()78 const event = 'event.ns'79 const handler = () => {}80 const handler2 = () => {}81 expect(listenerCount()).toBe(0)82 on(event, handler)83 on(event, handler2)84 expect(listenerCount()).toBe(2)85 expect(listenerCount()).toEqual(listenerCount(event))86 })87 test('带大äº1ä¸ä¸ªå½å空é´', () => {88 const { on, listenerCount } = useEvent()89 const event = 'event.ns.ns2'90 const handler = () => {}91 const handler2 = () => {}92 expect(listenerCount()).toBe(0)93 on(event, handler)94 on(event, handler2)95 expect(listenerCount()).toBe(4)96 expect(listenerCount()).toEqual(listenerCount(event))97 })98})99describe('1次æ§è®¢é
', () => {100 test('æ å½å空é´', () => {101 const { once, emit, listenerCount } = useEvent()102 const event = 'event'103 const handler = () => {}104 expect(listenerCount()).toBe(0)105 once(event, handler)106 expect(listenerCount()).toBe(1)107 expect(listenerCount()).toEqual(listenerCount(event))108 emit(event)109 expect(listenerCount()).toBe(0)110 expect(listenerCount()).toEqual(listenerCount(event))111 })112 test('带1ä¸ä¸ªå½å空é´', () => {113 const { once, emit, listenerCount } = useEvent()114 const event = 'event.ns'115 const handler = () => {}116 expect(listenerCount()).toBe(0)117 once(event, handler)118 expect(listenerCount()).toBe(1)119 expect(listenerCount()).toEqual(listenerCount(event))120 emit(event)121 expect(listenerCount()).toBe(0)122 expect(listenerCount()).toEqual(listenerCount(event))123 })124 test('带大äº1ä¸ä¸ªå½å空é´', () => {125 const { once, emit, listenerCount } = useEvent()126 const event = 'event.ns.ns2'127 const handler = () => {}128 expect(listenerCount()).toBe(0)129 once(event, handler)130 expect(listenerCount()).toBe(2)131 expect(listenerCount()).toEqual(listenerCount(event))132 emit(event)133 expect(listenerCount()).toBe(0)134 expect(listenerCount()).toEqual(listenerCount(event))135 })136})137describe('åæ¶è®¢é
', () => {138 test('æ å½å空é´-æå®å¤çå¨åæ¶', () => {139 const { on, off, listenerCount } = useEvent()140 const event = 'event'141 const handler = () => {}142 expect(listenerCount()).toBe(0)143 on(event, handler)144 expect(listenerCount()).toBe(1)145 expect(listenerCount()).toEqual(listenerCount(event))146 off (event, handler)147 expect(listenerCount()).toBe(0)148 })149 test('带1ä¸ä¸ªå½å空é´-æå®å¤çå¨åæ¶', () => {150 const { on, off, listenerCount } = useEvent()151 const event = 'event.ns'152 const handler = () => {}153 expect(listenerCount()).toBe(0)154 on(event, handler)155 expect(listenerCount()).toBe(1)156 expect(listenerCount()).toEqual(listenerCount(event))157 off (event, handler)158 expect(listenerCount()).toBe(0)159 })160 test('带大äº1ä¸ä¸ªå½å空é´,æå®å¤çå¨åæ¶', () => {161 const { on, off, listenerCount } = useEvent()162 const event = 'event.ns.ns2'163 const handler = () => {}164 expect(listenerCount()).toBe(0)165 on(event, handler)166 expect(listenerCount()).toBe(2)167 expect(listenerCount()).toEqual(listenerCount(event))168 off (event, handler)169 expect(listenerCount()).toBe(0)170 })171 test('å¤ä¸ªå½å空é´è®¢é
ï¼å个å½å空é´åæ¶-æå®å¤çå¨', () => {172 const { on, off, listenerCount } = useEvent()173 const event = 'event'174 const ns = 'sn'175 const ns2 = 'ns2'176 const handler = () => {}177 expect(listenerCount()).toBe(0)178 on(`${event}.${ns}.${ns2}`, handler)179 expect(listenerCount()).toBe(2)180 expect(listenerCount()).toEqual(listenerCount(event))181 off (`event.${ns}`, handler)182 expect(listenerCount()).toBe(1)183 expect(listenerCount()).toEqual(listenerCount(`${event}.${ns2}`))184 })185 test('å¤ä¸ªå½å空é´è®¢é
ï¼å个å½å空é´åæ¶-ä¸æå®å¤çå¨', () => {186 const { on, off, listenerCount } = useEvent()187 const event = 'event'188 const ns = 'sn'189 const ns2 = 'ns2'190 const handler = () => {}191 expect(listenerCount()).toBe(0)192 on(`${event}.${ns}.${ns2}`, handler)193 expect(listenerCount()).toBe(2)194 expect(listenerCount()).toEqual(listenerCount(event))195 off (`event.${ns}`)196 expect(listenerCount()).toBe(1)197 expect(listenerCount()).toEqual(listenerCount(`${event}.${ns2}`))198 })199 test('å¤ä¸ªå½å空é´è®¢é
ï¼ä¸å¸¦å½å空é´ä¸æ¬¡æ§å
¨é¨åæ¶-ä¸æå®å¤çå¨', () => {200 const { on, off, listenerCount } = useEvent()201 const event = 'event'202 const ns = 'sn'203 const ns2 = 'ns2'204 const handler = () => {}205 expect(listenerCount()).toBe(0)206 on(`${event}.${ns}.${ns2}`, handler)207 expect(listenerCount()).toBe(2)208 expect(listenerCount()).toEqual(listenerCount(event))209 off (event)210 expect(listenerCount()).toBe(0)211 })212 test('ç¸åäºä»¶å¤ä¸ªå¤çå¨è®¢é
ï¼æå®å¤çå¨åæ¶', () => {213 const { on, off, listenerCount } = useEvent()214 const event = 'event'215 const handler = () => {}216 const handler2 = () => {}217 expect(listenerCount()).toBe(0)218 on(event, handler)219 expect(listenerCount()).toBe(1)220 on(event, handler2)221 expect(listenerCount()).toBe(2)222 off(event, handler)223 expect(listenerCount()).toBe(1)224 off(event, handler2)225 expect(listenerCount()).toBe(0)226 })227})228describe('äºä»¶è§¦å', () => {229 test('æ å½å空é´', () => {230 const { on, emit } = useEvent()231 const event = 'event'232 const handler = jest.fn()233 on(event, handler)234 emit(event)235 expect(handler).toHaveBeenCalled()236 })237 test('触åæå®å½å空é´çäºä»¶', () => {238 const { on, emit } = useEvent()239 const event = 'event.ns'240 const handler = jest.fn()241 on(event, handler)242 emit(event)243 expect(handler).toHaveBeenCalled()244 })245 test('åæ¶è§¦åå¤ä¸ªå½å空é´çäºä»¶', () => {246 const { on, emit } = useEvent()247 const event = 'event'248 const handler = jest.fn()249 const handler2 = jest.fn()250 on(`${event}.ns`, handler)251 on(`${event}.ns2`, handler2)252 emit(event)253 expect(handler).toHaveBeenCalled()254 expect(handler2).toHaveBeenCalled()255 })256 test('带å触å', () => {257 const { on, emit } = useEvent()258 const event = 'event'259 const handler = jest.fn()260 const a = 1261 on(event, handler)262 emit(event, a)263 expect(handler).toHaveBeenCalled()264 const params = handler.mock.lastCall265 expect(params[1]).toBe(a)266 })267 test('ç»å®æº¢åºå¼å¸¸', () => {268 const { on, getMaxListeners, listenerCount, setMaxListeners } = useEvent()269 const max = getMaxListeners() + 1270 setMaxListeners(max)271 const bind = () => {272 const event = 'event'273 const handler = () => {}274 for (let i = 0; i < max; i ++) {275 on(event + i, handler)276 }277 }278 expect(bind).toThrowError(/Reached the maximum/)279 expect(listenerCount()).toEqual(max)280 })281})282describe('åæ¶ææ订é
', () => {283 test('æ å½å空é´-æå®å¤çå¨åæ¶', () => {284 const { on, off, listenerCount } = useEvent()285 const event = 'event'286 const handler = () => {}287 expect(listenerCount()).toBe(0)288 on(event, handler)289 expect(listenerCount()).toBe(1)290 expect(listenerCount()).toEqual(listenerCount(event))291 off('*')292 expect(listenerCount()).toBe(0)293 })294 test('带1ä¸ä¸ªå½å空é´-æå®å¤çå¨åæ¶', () => {295 const { on, off, listenerCount } = useEvent()296 const event = 'event.ns'297 const handler = () => {}298 expect(listenerCount()).toBe(0)299 on(event, handler)300 expect(listenerCount()).toBe(1)301 expect(listenerCount()).toEqual(listenerCount(event))302 off('*')303 expect(listenerCount()).toBe(0)304 })305 test('带大äº1ä¸ä¸ªå½å空é´,æå®å¤çå¨åæ¶', () => {306 const { on, off, listenerCount } = useEvent()307 const event = 'event.ns.ns2'308 const handler = () => {}309 expect(listenerCount()).toBe(0)310 on(event, handler)311 expect(listenerCount()).toBe(2)312 expect(listenerCount()).toEqual(listenerCount(event))313 off('*')314 expect(listenerCount()).toBe(0)315 })316 test('å¤ä¸ªå½å空é´è®¢é
ï¼å个å½å空é´åæ¶-æå®å¤çå¨', () => {317 const { on, off, listenerCount } = useEvent()318 const event = 'event'319 const ns = 'sn'320 const ns2 = 'ns2'321 const handler = () => {}322 expect(listenerCount()).toBe(0)323 on(`${event}.${ns}.${ns2}`, handler)324 expect(listenerCount()).toBe(2)325 expect(listenerCount()).toEqual(listenerCount(event))326 off('*')327 expect(listenerCount()).toBe(0)328 })329 test('å¤ä¸ªå½å空é´è®¢é
ï¼å个å½å空é´åæ¶-ä¸æå®å¤çå¨', () => {330 const { on, off, listenerCount } = useEvent()331 const event = 'event'332 const ns = 'sn'333 const ns2 = 'ns2'334 const handler = () => {}335 expect(listenerCount()).toBe(0)336 on(`${event}.${ns}.${ns2}`, handler)337 expect(listenerCount()).toBe(2)338 expect(listenerCount()).toEqual(listenerCount(event))339 off('*')340 expect(listenerCount()).toBe(0)341 })342 test('å¤ä¸ªå½å空é´è®¢é
ï¼ä¸å¸¦å½å空é´ä¸æ¬¡æ§å
¨é¨åæ¶-ä¸æå®å¤çå¨', () => {343 const { on, off, listenerCount } = useEvent()344 const event = 'event'345 const ns = 'sn'346 const ns2 = 'ns2'347 const handler = () => {}348 expect(listenerCount()).toBe(0)349 on(`${event}.${ns}.${ns2}`, handler)350 expect(listenerCount()).toBe(2)351 expect(listenerCount()).toEqual(listenerCount(event))352 off('*')353 expect(listenerCount()).toBe(0)354 })355 test('ç¸åäºä»¶å¤ä¸ªå¤çå¨è®¢é
ï¼æå®å¤çå¨åæ¶', () => {356 const { on, off, listenerCount } = useEvent()357 const event = 'event'358 const handler = () => {}359 const handler2 = () => {}360 expect(listenerCount()).toBe(0)361 on(event, handler)362 expect(listenerCount()).toBe(1)363 on(event, handler2)364 expect(listenerCount()).toBe(2)365 off('*')366 expect(listenerCount()).toBe(0)367 })...
socketConnect.js
Source:socketConnect.js
...17 const value = {}18 const socket = new Socket(function() {19 this.emit('connect', value)20 })21 t.is(socket.listenerCount('error'), 0)22 t.is(socket.listenerCount('connect'), 0)23 const p = socketConnect(socket, 'foo')24 t.is(socket.listenerCount('error'), 1)25 t.is(socket.listenerCount('connect'), 1)26 const result = await p27 t.is(result, value)28 t.is(socket.listenerCount('error'), 0)29 t.is(socket.listenerCount('connect'), 0)30})31test('rejects if "error" is emitted', t => {32 const error = new Error('foobar')33 const socket = new Socket(function() {34 this.emit('error', error)35 })36 t.is(socket.listenerCount('error'), 0)37 t.is(socket.listenerCount('connect'), 0)38 const p = socketConnect(socket, 'foo')39 t.is(socket.listenerCount('error'), 1)40 t.is(socket.listenerCount('connect'), 1)41 return p.catch(err => {42 t.is(err, error)43 t.is(socket.listenerCount('error'), 0)44 t.is(socket.listenerCount('connect'), 0)45 })...
Using AI Code Generation
1import { listenerCount } from 'storybook-root';2import { listenerCount } from 'storybook-root';3import { listenerCount } from 'storybook-root';4import { listenerCount } from 'storybook-root';5import { listenerCount } from 'storybook-root';6import { listenerCount } from 'storybook-root';7import { listenerCount } from 'storybook-root';8import { listenerCount } from 'storybook-root';9import { listenerCount } from 'storybook-root';10import { listenerCount } from 'storybook-root';11import { listenerCount } from 'storybook-root';12import { listenerCount } from 'storybook-root';13import { listenerCount } from 'storybook-root';14import { listenerCount } from 'storybook-root';15import { listenerCount } from 'storybook-root';16import { listenerCount } from 'storybook-root';17import { listenerCount } from 'storybook-root';18import { listenerCount } from 'storybook-root';19import { listenerCount } from 'storybook-root';20import { listenerCount } from 'storybook-root';
Using AI Code Generation
1const { listenerCount } = require('storybook-root');2const { listenerCount } = require('storybook-root');3const { listenerCount } = require('storybook-root');4const { listenerCount } = require('storybook-root');5const { listenerCount } = require('storybook-root');6const { listenerCount } = require('storybook-root');7const { listenerCount } = require('storybook-root');8const { listenerCount } = require('storybook-root');9const { listenerCount } = require('storybook-root');10const { listenerCount } = require('storybook-root');11const { listenerCount } = require('storybook-root');12const { listenerCount } = require('storybook-root');13const { listenerCount } = require
Using AI Code Generation
1const listenerCount = require('storybook-root').listenerCount;2console.log(listenerCount());3const listenerCount = require('storybook-root').listenerCount;4console.log(listenerCount());5const listenerCount = require('storybook-root').listenerCount;6console.log(listenerCount());7const listenerCount = require('storybook-root').listenerCount;8console.log(listenerCount());9const listenerCount = require('storybook-root').listenerCount;10console.log(listenerCount());11const listenerCount = require('storybook-root').listenerCount;12console.log(listenerCount());13const listenerCount = require('storybook-root').listenerCount;14console.log(listenerCount());15const listenerCount = require('storybook-root').listenerCount;16console.log(listenerCount());17const listenerCount = require('storybook-root').listenerCount;18console.log(listenerCount());19const listenerCount = require('storybook-root').listenerCount;20console.log(listenerCount());21const listenerCount = require('storybook-root').listenerCount;22console.log(listenerCount());23const listenerCount = require('storybook-root').listenerCount;24console.log(listenerCount());25const listenerCount = require('storybook
Using AI Code Generation
1const myEmitter = require('storybook-root');2const count = myEmitter.listenerCount('event');3console.log(count);4const myEmitter = require('storybook-root');5const count = myEmitter.listenerCount('event');6console.log(count);7const myEmitter = require('storybook-root');8const count = myEmitter.listenerCount('event');9console.log(count);10const myEmitter = require('storybook-root');11const count = myEmitter.listenerCount('event');12console.log(count);13const myEmitter = require('storybook-root');14const count = myEmitter.listenerCount('event');15console.log(count);16const myEmitter = require('storybook-root');17const count = myEmitter.listenerCount('event');18console.log(count);19const myEmitter = require('storybook-root');20const count = myEmitter.listenerCount('event');21console.log(count);22const myEmitter = require('storybook-root');23const count = myEmitter.listenerCount('event');24console.log(count);25const myEmitter = require('storybook-root');26const count = myEmitter.listenerCount('event');27console.log(count);28const myEmitter = require('storybook-root');29const count = myEmitter.listenerCount('event');30console.log(count);31const myEmitter = require('storybook-root');32const count = myEmitter.listenerCount('event');33console.log(count);
Using AI Code Generation
1import { listenerCount } from 'storybook-root';2export default function test() {3 console.log(listenerCount);4}5export const listenerCount = () => {6 console.log('listenerCount');7};8{9}10import { listenerCount } from 'storybook-root';11export default function test() {12 console.log(listenerCount);13}14export const listenerCount = () => {15 console.log('listenerCount');16};17{18}19import { listenerCount } from 'storybook-root';20export default function test() {21 console.log(listenerCount);22}23export const listenerCount = () => {24 console.log('listenerCount');25};26{27}28import { listenerCount } from 'storybook-root';29export default function test() {30 console.log(listenerCount);31}32export const listenerCount = () => {33 console.log('listenerCount');34};35{36}37import { listenerCount } from 'storybook-root';38export default function test() {39 console.log(listenerCount);40}41export const listenerCount = () => {42 console.log('listenerCount');43};44{
Automation Testing Tutorials
Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.
LambdaTest Learning Hubs:
- JUnit Tutorial
- TestNG Tutorial
- Webdriver Tutorial
- WebDriverIO Tutorial
- Protractor Tutorial
- Selenium 4 Tutorial
- Jenkins Tutorial
- NUnit Tutorial
- Jest Tutorial
- Playwright Tutorial
- Cypress Tutorial
- PyTest Tutorial
YouTube
You could also refer to video tutorials over LambdaTest YouTube channel to get step by step demonstration from industry experts.
Run storybook-root automation tests on LambdaTest cloud grid
Perform automation testing on 3000+ real desktop and mobile devices online.
Try LambdaTest Now !!
Get 100 minutes of automation test minutes FREE!!
Was this article helpful?
