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{"version":3,"sources":["../../src/Interceptor.ts","../../src/createRequestId.ts"],"sourcesContent":["import { Logger } from '@open-draft/logger'\nimport { Emitter, Listener } from 'strict-event-emitter'\n\nexport type InterceptorEventMap = Record<string, any>\nexport type InterceptorSubscription = () => void\n\n/**\n * Request header name to detect when a single request\n * is being handled by nested interceptors (XHR -> ClientRequest).\n * Obscure by design to prevent collisions with user-defined headers.\n * Ideally, come up with the Interceptor-level mechanism for this.\n * @see https://github.com/mswjs/interceptors/issues/378\n */\nexport const INTERNAL_REQUEST_ID_HEADER_NAME =\n 'x-interceptors-internal-request-id'\n\nexport function getGlobalSymbol<V>(symbol: Symbol): V | undefined {\n return (\n // @ts-ignore https://github.com/Microsoft/TypeScript/issues/24587\n globalThis[symbol] || undefined\n )\n}\n\nfunction setGlobalSymbol(symbol: Symbol, value: any): void {\n // @ts-ignore\n globalThis[symbol] = value\n}\n\nexport function deleteGlobalSymbol(symbol: Symbol): void {\n // @ts-ignore\n delete globalThis[symbol]\n}\n\nexport enum InterceptorReadyState {\n INACTIVE = 'INACTIVE',\n APPLYING = 'APPLYING',\n APPLIED = 'APPLIED',\n DISPOSING = 'DISPOSING',\n DISPOSED = 'DISPOSED',\n}\n\nexport type ExtractEventNames<Events extends Record<string, any>> =\n Events extends Record<infer EventName, any> ? EventName : never\n\nexport class Interceptor<Events extends InterceptorEventMap> {\n protected emitter: Emitter<Events>\n protected subscriptions: Array<InterceptorSubscription>\n protected logger: Logger\n\n public readyState: InterceptorReadyState\n\n constructor(private readonly symbol: symbol) {\n this.readyState = InterceptorReadyState.INACTIVE\n\n this.emitter = new Emitter()\n this.subscriptions = []\n this.logger = new Logger(symbol.description!)\n\n // Do not limit the maximum number of listeners\n // so not to limit the maximum amount of parallel events emitted.\n this.emitter.setMaxListeners(0)\n\n this.logger.info('constructing the interceptor...')\n }\n\n /**\n * Determine if this interceptor can be applied\n * in the current environment.\n */\n protected checkEnvironment(): boolean {\n return true\n }\n\n /**\n * Apply this interceptor to the current process.\n * Returns an already running interceptor instance if it's present.\n */\n public apply(): void {\n const logger = this.logger.extend('apply')\n logger.info('applying the interceptor...')\n\n if (this.readyState === InterceptorReadyState.APPLIED) {\n logger.info('intercepted already applied!')\n return\n }\n\n const shouldApply = this.checkEnvironment()\n\n if (!shouldApply) {\n logger.info('the interceptor cannot be applied in this environment!')\n return\n }\n\n this.readyState = InterceptorReadyState.APPLYING\n\n // Whenever applying a new interceptor, check if it hasn't been applied already.\n // This enables to apply the same interceptor multiple times, for example from a different\n // interceptor, only proxying events but keeping the stubs in a single place.\n const runningInstance = this.getInstance()\n\n if (runningInstance) {\n logger.info('found a running instance, reusing...')\n\n // Proxy any listeners you set on this instance to the running instance.\n this.on = (event, listener) => {\n logger.info('proxying the \"%s\" listener', event)\n\n // Add listeners to the running instance so they appear\n // at the top of the event listeners list and are executed first.\n runningInstance.emitter.addListener(event, listener)\n\n // Ensure that once this interceptor instance is disposed,\n // it removes all listeners it has appended to the running interceptor instance.\n this.subscriptions.push(() => {\n runningInstance.emitter.removeListener(event, listener)\n logger.info('removed proxied \"%s\" listener!', event)\n })\n\n return this\n }\n\n this.readyState = InterceptorReadyState.APPLIED\n\n return\n }\n\n logger.info('no running instance found, setting up a new instance...')\n\n // Setup the interceptor.\n this.setup()\n\n // Store the newly applied interceptor instance globally.\n this.setInstance()\n\n this.readyState = InterceptorReadyState.APPLIED\n }\n\n /**\n * Setup the module augments and stubs necessary for this interceptor.\n * This method is not run if there's a running interceptor instance\n * to prevent instantiating an interceptor multiple times.\n */\n protected setup(): void {}\n\n /**\n * Listen to the interceptor's public events.\n */\n public on<EventName extends ExtractEventNames<Events>>(\n event: EventName,\n listener: Listener<Events[EventName]>\n ): this {\n const logger = this.logger.extend('on')\n\n if (\n this.readyState === InterceptorReadyState.DISPOSING ||\n this.readyState === InterceptorReadyState.DISPOSED\n ) {\n logger.info('cannot listen to events, already disposed!')\n return this\n }\n\n logger.info('adding \"%s\" event listener:', event, listener)\n\n this.emitter.on(event, listener)\n return this\n }\n\n public once<EventName extends ExtractEventNames<Events>>(\n event: EventName,\n listener: Listener<Events[EventName]>\n ): this {\n this.emitter.once(event, listener)\n return this\n }\n\n public off<EventName extends ExtractEventNames<Events>>(\n event: EventName,\n listener: Listener<Events[EventName]>\n ): this {\n this.emitter.off(event, listener)\n return this\n }\n\n public removeAllListeners<EventName extends ExtractEventNames<Events>>(\n event?: EventName\n ): this {\n this.emitter.removeAllListeners(event)\n return this\n }\n\n /**\n * Disposes of any side-effects this interceptor has introduced.\n */\n public dispose(): void {\n const logger = this.logger.extend('dispose')\n\n if (this.readyState === InterceptorReadyState.DISPOSED) {\n logger.info('cannot dispose, already disposed!')\n return\n }\n\n logger.info('disposing the interceptor...')\n this.readyState = InterceptorReadyState.DISPOSING\n\n if (!this.getInstance()) {\n logger.info('no interceptors running, skipping dispose...')\n return\n }\n\n // Delete the global symbol as soon as possible,\n // indicating that the interceptor is no longer running.\n this.clearInstance()\n\n logger.info('global symbol deleted:', getGlobalSymbol(this.symbol))\n\n if (this.subscriptions.length > 0) {\n logger.info('disposing of %d subscriptions...', this.subscriptions.length)\n\n for (const dispose of this.subscriptions) {\n dispose()\n }\n\n this.subscriptions = []\n\n logger.info('disposed of all subscriptions!', this.subscriptions.length)\n }\n\n this.emitter.removeAllListeners()\n logger.info('destroyed the listener!')\n\n this.readyState = InterceptorReadyState.DISPOSED\n }\n\n private getInstance(): this | undefined {\n const instance = getGlobalSymbol<this>(this.symbol)\n this.logger.info('retrieved global instance:', instance?.constructor?.name)\n return instance\n }\n\n private setInstance(): void {\n setGlobalSymbol(this.symbol, this)\n this.logger.info('set global instance!', this.symbol.description)\n }\n\n private clearInstance(): void {\n deleteGlobalSymbol(this.symbol)\n this.logger.info('cleared global instance!', this.symbol.description)\n }\n}\n","/**\n * Generate a random ID string to represent a request.\n * @example\n * createRequestId()\n * // \"f774b6c9c600f\"\n */\nexport function createRequestId(): string {\n return 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