/
setupWorker.ts
230 lines (204 loc) · 6.7 KB
/
setupWorker.ts
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import { invariant } from 'outvariant'
import { isNodeProcess } from 'is-node-process'
import {
SetupWorkerInternalContext,
ServiceWorkerIncomingEventsMap,
WorkerLifecycleEventsMap,
StartReturnType,
StopHandler,
StartHandler,
StartOptions,
} from './glossary'
import { createStartHandler } from './start/createStartHandler'
import { createStop } from './stop/createStop'
import { ServiceWorkerMessage } from './start/utils/createMessageChannel'
import { RequestHandler } from '../handlers/RequestHandler'
import { DEFAULT_START_OPTIONS } from './start/utils/prepareStartHandler'
import { createFallbackStart } from './start/createFallbackStart'
import { createFallbackStop } from './stop/createFallbackStop'
import { devUtils } from '../utils/internal/devUtils'
import { SetupApi } from '../SetupApi'
import { mergeRight } from '../utils/internal/mergeRight'
import { SetupWorkerApi as SetupWorker } from './glossary'
interface Listener {
target: EventTarget
eventType: string
callback: EventListener
}
class SetupWorkerApi
extends SetupApi<WorkerLifecycleEventsMap>
implements SetupWorker
{
private context: SetupWorkerInternalContext
private startHandler: StartHandler = null as any
private stopHandler: StopHandler = null as any
private listeners: Array<Listener>
constructor(...handlers: Array<RequestHandler>) {
super(...handlers)
invariant(
!isNodeProcess(),
devUtils.formatMessage(
'Failed to execute `setupWorker` in a non-browser environment. Consider using `setupServer` for Node.js environment instead.',
),
)
this.listeners = []
this.context = this.createWorkerContext()
}
private createWorkerContext(): SetupWorkerInternalContext {
const context = {
// Mocking is not considered enabled until the worker
// signals back the successful activation event.
isMockingEnabled: false,
startOptions: null as any,
worker: null,
registration: null,
requestHandlers: this.currentHandlers,
emitter: this.emitter,
workerChannel: {
on: <EventType extends keyof ServiceWorkerIncomingEventsMap>(
eventType: EventType,
callback: (
event: MessageEvent,
message: ServiceWorkerMessage<
EventType,
ServiceWorkerIncomingEventsMap[EventType]
>,
) => void,
) => {
this.context.events.addListener(
navigator.serviceWorker,
'message',
(event: MessageEvent) => {
// Avoid messages broadcasted from unrelated workers.
if (event.source !== this.context.worker) {
return
}
const message = event.data as ServiceWorkerMessage<
typeof eventType,
any
>
if (!message) {
return
}
if (message.type === eventType) {
callback(event, message)
}
},
)
},
send: (type: any) => {
this.context.worker?.postMessage(type)
},
},
events: {
addListener: (
target: EventTarget,
eventType: string,
callback: EventListener,
) => {
target.addEventListener(eventType, callback)
this.listeners.push({ eventType, target, callback })
return () => {
target.removeEventListener(eventType, callback)
}
},
removeAllListeners: () => {
for (const { target, eventType, callback } of this.listeners) {
target.removeEventListener(eventType, callback)
}
this.listeners = []
},
once: <EventType extends keyof ServiceWorkerIncomingEventsMap>(
eventType: EventType,
) => {
const bindings: Array<() => void> = []
return new Promise<
ServiceWorkerMessage<
typeof eventType,
ServiceWorkerIncomingEventsMap[typeof eventType]
>
>((resolve, reject) => {
const handleIncomingMessage = (event: MessageEvent) => {
try {
const message = event.data
if (message.type === eventType) {
resolve(message)
}
} catch (error) {
reject(error)
}
}
bindings.push(
this.context.events.addListener(
navigator.serviceWorker,
'message',
handleIncomingMessage,
),
this.context.events.addListener(
navigator.serviceWorker,
'messageerror',
reject,
),
)
}).finally(() => {
bindings.forEach((unbind) => unbind())
})
},
},
useFallbackMode:
!('serviceWorker' in navigator) || location.protocol === 'file:',
}
/**
* @todo Not sure I like this but "this.currentHandlers"
* updates never bubble to "this.context.requestHandlers".
*/
Object.defineProperties(context, {
requestHandlers: {
get: () => this.currentHandlers,
},
})
this.startHandler = context.useFallbackMode
? createFallbackStart(context)
: createStartHandler(context)
this.stopHandler = context.useFallbackMode
? createFallbackStop(context)
: createStop(context)
return context
}
public async start(options: StartOptions = {}): StartReturnType {
this.context.startOptions = mergeRight(
DEFAULT_START_OPTIONS,
options,
) as SetupWorkerInternalContext['startOptions']
return await this.startHandler(this.context.startOptions, options)
}
public printHandlers(): void {
const handlers = this.listHandlers()
handlers.forEach((handler) => {
const { header, callFrame } = handler.info
const pragma = handler.info.hasOwnProperty('operationType')
? '[graphql]'
: '[rest]'
console.groupCollapsed(`${pragma} ${header}`)
if (callFrame) {
console.log(`Declaration: ${callFrame}`)
}
console.log('Handler:', handler)
console.groupEnd()
})
}
public stop(): void {
super.dispose()
this.context.events.removeAllListeners()
this.context.emitter.removeAllListeners()
this.stopHandler()
}
}
/**
* Sets up a requests interception in the browser with the given request handlers.
* @param {RequestHandler[]} handlers List of request handlers.
* @see {@link https://mswjs.io/docs/api/setup-worker `setupWorker`}
*/
export function setupWorker(...handlers: Array<RequestHandler>): SetupWorker {
return new SetupWorkerApi(...handlers)
}