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@vercel/microfrontends

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Defines configuration and utilities for microfrontends development

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{"version":3,"sources":["../../src/next/middleware/index.ts","../../src/next/middleware/middleware.ts","../../src/config/microfrontends-config/client/index.ts","../../src/config/well-known/endpoints.ts","../../src/next/utils/route-to-local-proxy.ts","../../src/config/microfrontends-config/isomorphic/index.ts","../../src/config/errors.ts","../../src/config/microfrontends-config/utils/get-config-from-env.ts","../../src/config/schema/utils/is-default-app.ts","../../src/config/overrides/constants.ts","../../src/config/overrides/is-override-cookie.ts","../../src/config/overrides/get-override-from-cookie.ts","../../src/config/overrides/parse-overrides.ts","../../src/config/microfrontends-config/isomorphic/validation.ts","../../src/config/microfrontends-config/isomorphic/utils/generate-asset-prefix.ts","../../src/config/microfrontends-config/isomorphic/utils/generate-port.ts","../../src/config/microfrontends-config/isomorphic/host.ts","../../src/config/microfrontends-config/isomorphic/utils/generate-automation-bypass-env-var-name.ts","../../src/config/microfrontends-config/isomorphic/application.ts","../../src/config/microfrontends-config/isomorphic/constants.ts"],"sourcesContent":["export * from './middleware';\nexport * from './types';\n","/// <reference types=\"@edge-runtime/types\" />\n\nimport type { NextRequest } from 'next/server';\nimport { NextResponse } from 'next/server';\nimport { pathToRegexp } from 'path-to-regexp';\nimport type { ChildApplication } from '../../config/microfrontends-config/isomorphic/application';\nimport { getWellKnownClientData } from '../../config/well-known/endpoints';\nimport type { WellKnownClientData } from '../../config/well-known/types';\nimport { routeToLocalProxy } from '../utils/route-to-local-proxy';\nimport { MicrofrontendConfigIsomorphic } from '../../config/microfrontends-config/isomorphic';\nimport type {\n MicrofrontendsMiddleware,\n MicrofrontendsMiddlewareHandler,\n} from './types';\n\n// Extracts the flag value override if one is present in the headers\nfunction getMfeFlagHeader(req: NextRequest): boolean | null {\n const flagValue = req.headers.get('x-vercel-mfe-flag-value');\n if (flagValue === 'true') {\n return true;\n }\n if (flagValue === 'false') {\n return false;\n }\n return null;\n}\n\ninterface GetFlagHandlerParams {\n application: ChildApplication;\n flagFn: () => Promise<boolean>;\n flagName: string;\n pattern: RegExp;\n localProxyPort: number;\n}\n\nfunction getFlagHandler({\n application,\n flagFn,\n flagName,\n pattern,\n localProxyPort,\n}: GetFlagHandlerParams): MicrofrontendsMiddlewareHandler {\n return async (req: NextRequest): Promise<NextResponse | undefined> => {\n try {\n const pathname = req.nextUrl.pathname;\n\n // If the pattern doesn't match, we don't need to execute the flag\n const flagValueFromHeader = routeToLocalProxy()\n ? getMfeFlagHeader(req)\n : null;\n if (pattern.test(pathname) && (flagValueFromHeader ?? (await flagFn()))) {\n const headers = new Headers(req.headers);\n /**\n * This header informs the proxy which zone the route the request to.\n * It will override any provided redirect / rewrite host.\n *\n * If a rewrite / redirect includes this header, the proxy will perform the\n * action, but will also replace the host with corresponding host for the zone.\n */\n headers.set('x-vercel-mfe-zone', application.name);\n const middlewareResponseInit = {\n request: {\n headers,\n },\n };\n if (routeToLocalProxy()) {\n if (process.env.MFE_DEBUG) {\n // eslint-disable-next-line no-console\n console.log(\n `Routing flagged path \"${pathname}\" to local proxy for application \"${application.name}\"`,\n );\n }\n const url = req.nextUrl;\n url.host = `localhost:${localProxyPort}`;\n return NextResponse.rewrite(url, middlewareResponseInit);\n }\n if (process.env.MFE_DEBUG) {\n // eslint-disable-next-line no-console\n console.log(\n `Routing flagged path \"${pathname}\" to application \"${application.name}\"`,\n );\n }\n return NextResponse.next(middlewareResponseInit);\n }\n } catch (e) {\n // eslint-disable-next-line no-console\n console.error(\n `An error occured in the microfrontends middleware evaluating the flag \"${flagName}\":`,\n e,\n );\n // still want to throw the error, just also making sure the error is logged\n throw e;\n }\n };\n // If the path does not match the pattern, we don't do anything and let the request continue\n}\n\nfunction getWellKnownClientConfigMiddleware(\n microfrontends: MicrofrontendConfigIsomorphic,\n flagValues: Record<string, () => Promise<boolean>>,\n): MicrofrontendsMiddlewareHandler {\n return async (_: NextRequest): Promise<NextResponse | undefined> => {\n return NextResponse.json<WellKnownClientData>(\n await getWellKnownClientData(\n JSON.stringify(microfrontends.toClientConfig().serialize()),\n flagValues,\n ),\n );\n };\n}\n\n/**\n * Returns an array of middleware functions that will handle routing to the\n * right micro-frontends for the provided configuration.\n *\n * @param config - The micro-frontends configuration object.\n * @param flagValues - An object that maps flag names to functions that return the flag value.\n */\nexport function getMicrofrontendsMiddleware({\n request,\n flagValues,\n}: {\n request: NextRequest;\n flagValues: Record<string, () => Promise<boolean>>;\n}): MicrofrontendsMiddleware[] {\n const microfrontends = MicrofrontendConfigIsomorphic.fromEnv({\n cookies: request.cookies.getAll(),\n });\n const middlewares: MicrofrontendsMiddleware[] = [];\n\n if (!process.env.NEXT_PUBLIC_MFE_CURRENT_APPLICATION) {\n throw new Error(\n 'The NEXT_PUBLIC_MFE_CURRENT_APPLICATION environment variable is not set. Did you run `withMicrofrontends` in your Next.js config?',\n );\n }\n\n const currentApplication = microfrontends.getApplication(\n process.env.NEXT_PUBLIC_MFE_CURRENT_APPLICATION,\n );\n\n if (!currentApplication.isDefault()) {\n return middlewares;\n }\n\n middlewares.push({\n src: '/.well-known/vercel/microfrontends/client-config',\n fn: getWellKnownClientConfigMiddleware(microfrontends, flagValues),\n });\n\n const localProxyPort = microfrontends.getLocalProxyPort();\n\n for (const application of microfrontends.getChildApplications()) {\n for (const pathGroup of application.routing) {\n const flagName = pathGroup.flag;\n if (flagName) {\n const flagFn = flagValues[flagName];\n if (!flagFn) {\n throw new Error(\n `Flag \"${flagName}\" was specified to control routing for path group \"${pathGroup.group}\" in application ${application.name} but not found in provided flag values. See https://vercel.com/docs/microfrontends/path-routing#add-microfrontends-middleware for more information.`,\n );\n }\n for (const path of pathGroup.paths) {\n const pattern = pathToRegexp(path);\n middlewares.push({\n src: pattern,\n fn: getFlagHandler({\n application,\n flagFn,\n flagName,\n pattern,\n localProxyPort,\n }),\n });\n }\n }\n }\n }\n\n return middlewares;\n}\n\n/**\n * Executes the middlewares returned by `getMicrofrontendsMiddleware` and\n * returns a `Response` if any of the micro-frontends middlewares match or\n * `undefined` if none match. If a `Response` object is returned, the calling\n * code should return that Response from the Next.js middleware in order to\n * stop execution of the middleware and perform the rewrite.\n *\n * @see {@link https://vercel.com/docs/microfrontends/path-routing#roll-out-routing-changes-safely-with-flags}\n */\nexport async function runMicrofrontendsMiddleware({\n request,\n flagValues,\n}: {\n request: NextRequest;\n flagValues: Record<string, () => Promise<boolean>>;\n}): Promise<Response | undefined> {\n const pathname = request.nextUrl.pathname;\n const middlewares = getMicrofrontendsMiddleware({\n request,\n flagValues,\n });\n\n for (const mware of middlewares) {\n if (\n typeof mware.src === 'string'\n ? pathname === mware.src\n : mware.src.test(pathname)\n ) {\n // eslint-disable-next-line no-await-in-loop\n const response = await mware.fn(request);\n if (response) {\n return response;\n }\n }\n }\n}\n","import { pathToRegexp } from 'path-to-regexp';\nimport type { ClientConfig } from './types';\n\nexport interface MicrofrontendConfigClientOptions {\n removeFlaggedPaths?: boolean;\n}\n\nconst regexpCache = new Map<string, RegExp>();\nconst getRegexp = (path: string): RegExp => {\n const existing = regexpCache.get(path);\n if (existing) {\n return existing;\n }\n\n const regexp = pathToRegexp(path);\n regexpCache.set(path, regexp);\n return regexp;\n};\n\nexport class MicrofrontendConfigClient {\n applications: ClientConfig['applications'];\n pathCache: Record<string, string> = {};\n private readonly serialized: ClientConfig;\n\n constructor(config: ClientConfig, opts?: MicrofrontendConfigClientOptions) {\n this.serialized = config;\n if (opts?.removeFlaggedPaths) {\n for (const app of Object.values(config.applications)) {\n if (app.routing) {\n app.routing = app.routing.filter((match) => !match.flag);\n }\n }\n }\n this.applications = config.applications;\n }\n\n /**\n * Create a new `MicrofrontendConfigClient` from a JSON string.\n * Config must be passed in to remain framework agnostic\n */\n static fromEnv(\n config: string | undefined,\n opts?: MicrofrontendConfigClientOptions,\n ): MicrofrontendConfigClient {\n if (!config) {\n throw new Error(\n 'Could not construct MicrofrontendConfigClient: configuration is empty or undefined. Did you set up your application with `withMicrofrontends`?',\n );\n }\n return new MicrofrontendConfigClient(\n JSON.parse(config) as ClientConfig,\n opts,\n );\n }\n\n isEqual(other: MicrofrontendConfigClient): boolean {\n return (\n this === other ||\n JSON.stringify(this.applications) === JSON.stringify(other.applications)\n );\n }\n\n getApplicationNameForPath(path: string): string | null {\n if (!path.startsWith('/')) {\n throw new Error(`Path must start with a /`);\n }\n\n if (this.pathCache[path]) {\n return this.pathCache[path];\n }\n\n const pathname = new URL(path, 'https://example.com').pathname;\n for (const [name, application] of Object.entries(this.applications)) {\n if (application.routing) {\n for (const group of application.routing) {\n for (const childPath of group.paths) {\n const regexp = getRegexp(childPath);\n if (regexp.test(pathname)) {\n this.pathCache[path] = name;\n return name;\n }\n }\n }\n }\n }\n const defaultApplication = Object.entries(this.applications).find(\n ([, application]) => application.default,\n );\n if (!defaultApplication) {\n return null;\n }\n\n this.pathCache[path] = defaultApplication[0];\n return defaultApplication[0];\n }\n\n serialize(): ClientConfig {\n return this.serialized;\n }\n}\n","import { MicrofrontendConfigClient } from '../microfrontends-config/client';\nimport type { WellKnownClientData } from './types';\n\n/**\n * @deprecated Add `/.well-known/vercel/microfrontends/client-config` to your middleware matcher instead.\n *\n * Returns data used by the client to ensure that navigations across\n * microfrontend boundaries are routed and prefetched correctly for flagged paths.\n * The client configuration is safe to expose to users.\n *\n * If there are no flagged paths, this endpoint is not used.\n *\n * This data should be exposed in a `.well-known/vercel/microfrontends/client-config` endpoint.\n */\nexport async function getWellKnownClientData(\n clientConfig: string | undefined,\n flagValues: Record<string, () => Promise<boolean>> = {},\n): Promise<WellKnownClientData> {\n const config = MicrofrontendConfigClient.fromEnv(clientConfig);\n for (const [applicationName, application] of Object.entries(\n config.applications,\n )) {\n if (!application.routing) {\n continue;\n }\n const newRoutingMatches = [];\n for (const pathGroup of application.routing) {\n if (pathGroup.flag) {\n const flagName = pathGroup.flag;\n const flagFn = flagValues[flagName];\n if (!flagFn) {\n throw new Error(\n `Flag \"${flagName}\" was specified to control routing for path group \"${pathGroup.group}\" in application ${applicationName} but not found in provided flag values.`,\n );\n }\n // eslint-disable-next-line no-await-in-loop\n const flagEnabled = await flagFn();\n if (flagEnabled) {\n newRoutingMatches.push(pathGroup);\n }\n } else {\n newRoutingMatches.push(pathGroup);\n }\n }\n application.routing = newRoutingMatches;\n }\n\n return {\n config: config.serialize(),\n };\n}\n","export function routeToLocalProxy(): boolean {\n const isDevEnv = (process.env.VERCEL_ENV ?? 'development') === 'development';\n\n return isDevEnv && Boolean(process.env.TURBO_TASK_HAS_MFE_PROXY);\n}\n","import { parse } from 'jsonc-parser';\nimport { getConfigStringFromEnv } from '../utils/get-config-from-env';\nimport { isDefaultApp } from '../../schema/utils/is-default-app';\nimport type { Config } from '../../schema/types';\nimport type { ClientConfig } from '../client/types';\nimport { MicrofrontendError } from '../../errors';\nimport { MicrofrontendConfigClient } from '../client';\nimport { type OverridesConfig, parseOverrides } from '../../overrides';\nimport { DefaultApplication, ChildApplication } from './application';\nimport { DEFAULT_LOCAL_PROXY_PORT } from './constants';\nimport {\n validateConfigDefaultApplication,\n validateConfigPaths,\n} from './validation';\n\n/**\n * A class to manage the microfrontends configuration.\n */\nexport class MicrofrontendConfigIsomorphic {\n config: Config;\n defaultApplication: DefaultApplication;\n childApplications: Record<string, ChildApplication> = {};\n overrides?: OverridesConfig;\n options?: Config['options'];\n\n private readonly serialized: {\n config: Config;\n overrides?: OverridesConfig;\n };\n\n constructor({\n config,\n overrides,\n }: {\n config: Config;\n overrides?: OverridesConfig;\n }) {\n // run validation on init\n MicrofrontendConfigIsomorphic.validate(config);\n\n const disableOverrides = config.options?.disableOverrides ?? false;\n this.overrides = overrides && !disableOverrides ? overrides : undefined;\n\n let defaultApplication: DefaultApplication | undefined;\n // create applications\n for (const [appId, appConfig] of Object.entries(config.applications)) {\n const appOverrides = !disableOverrides\n ? this.overrides?.applications[appId]\n : undefined;\n\n if (isDefaultApp(appConfig)) {\n defaultApplication = new DefaultApplication(appId, {\n app: appConfig,\n overrides: appOverrides,\n });\n } else {\n this.childApplications[appId] = new ChildApplication(appId, {\n app: appConfig,\n overrides: appOverrides,\n });\n }\n }\n\n // validate that this.defaultApplication is defined\n if (!defaultApplication) {\n throw new MicrofrontendError(\n 'Could not find default application in microfrontends configuration',\n {\n type: 'application',\n subtype: 'not_found',\n },\n );\n }\n this.defaultApplication = defaultApplication;\n\n this.config = config;\n this.options = config.options;\n this.serialized = {\n config,\n overrides,\n };\n }\n\n static validate(config: string | Config): Config {\n // let this throw if it's not valid JSON\n const c = typeof config === 'string' ? (parse(config) as Config) : config;\n\n validateConfigPaths(c.applications);\n validateConfigDefaultApplication(c.applications);\n\n return c;\n }\n\n static fromEnv({\n cookies,\n }: {\n cookies?: { name: string; value: string }[];\n }): MicrofrontendConfigIsomorphic {\n return new MicrofrontendConfigIsomorphic({\n config: parse(getConfigStringFromEnv()) as Config,\n overrides: parseOverrides(cookies ?? []),\n });\n }\n\n isOverridesDisabled(): boolean {\n return this.options?.disableOverrides ?? false;\n }\n\n getConfig(): Config {\n return this.config;\n }\n\n getApplicationsByType(): {\n defaultApplication?: DefaultApplication;\n applications: ChildApplication[];\n } {\n return {\n defaultApplication: this.defaultApplication,\n applications: Object.values(this.childApplications),\n };\n }\n\n getChildApplications(): ChildApplication[] {\n return Object.values(this.childApplications);\n }\n\n getAllApplications(): (DefaultApplication | ChildApplication)[] {\n return [\n this.defaultApplication,\n ...Object.values(this.childApplications),\n ].filter(Boolean);\n }\n\n getApplication(name: string): DefaultApplication | ChildApplication {\n // check the default\n if (\n this.defaultApplication.name === name ||\n this.defaultApplication.packageName === name\n ) {\n return this.defaultApplication;\n }\n const app =\n this.childApplications[name] ||\n Object.values(this.childApplications).find(\n (child) => child.packageName === name,\n );\n if (!app) {\n throw new MicrofrontendError(\n `Could not find microfrontends configuration for application \"${name}\"`,\n {\n type: 'application',\n subtype: 'not_found',\n },\n );\n }\n\n return app;\n }\n\n hasApplication(name: string): boolean {\n try {\n this.getApplication(name);\n return true;\n } catch {\n return false;\n }\n }\n\n getApplicationByProjectName(\n projectName: string,\n ): DefaultApplication | ChildApplication | undefined {\n // check the default\n if (this.defaultApplication.name === projectName) {\n return this.defaultApplication;\n }\n\n return Object.values(this.childApplications).find(\n (app) => app.name === projectName,\n );\n }\n\n /**\n * Returns the default application.\n */\n getDefaultApplication(): DefaultApplication {\n return this.defaultApplication;\n }\n\n /**\n * Returns the configured port for the local proxy\n */\n getLocalProxyPort(): number {\n return this.config.options?.localProxyPort ?? DEFAULT_LOCAL_PROXY_PORT;\n }\n\n /**\n * Serializes the class back to the Schema type.\n *\n * NOTE: This is used when writing the config to disk and must always match the input Schema\n */\n toSchemaJson(): Config {\n return this.serialized.config;\n }\n\n toClientConfig(): MicrofrontendConfigClient {\n const applications: ClientConfig['applications'] = Object.fromEntries(\n Object.entries(this.childApplications).map(([name, application]) => [\n name,\n {\n default: false,\n routing: application.routing,\n },\n ]),\n );\n\n // add the default application\n applications[this.defaultApplication.name] = {\n default: true,\n };\n\n return new MicrofrontendConfigClient({\n applications,\n });\n }\n\n serialize(): {\n config: Config;\n overrides?: OverridesConfig;\n } {\n return this.serialized;\n }\n}\n","export type MicrofrontendErrorType =\n | 'config'\n | 'packageJson'\n | 'vercelJson'\n | 'application'\n | 'unknown';\n\nexport type MicrofrontendErrorSubtype =\n | 'not_found'\n | 'inference_failed'\n | 'not_found_in_env'\n | 'invalid_asset_prefix'\n | 'invalid_main_path'\n | 'does_not_match_schema'\n | 'unable_to_read_file'\n | 'unsupported_validation_env'\n | 'unsupported_version'\n | 'invalid_path'\n | 'invalid_permissions'\n | 'invalid_syntax'\n | 'missing_microfrontend_config_path'\n | 'unsupported_operation';\n\n// A mapping of error types to their subtypes.\ninterface TypeToSubtype {\n application:\n | 'invalid_asset_prefix'\n | 'invalid_path'\n | 'multiple_package_managers'\n | 'not_found';\n config:\n | 'conflicting_paths'\n | 'depcrecated_field'\n | 'does_not_match_schema'\n | 'invalid_main_path'\n | 'invalid_preview_deployment_suffix'\n | 'multiple_default_applications'\n | 'no_default_application'\n | 'not_found_in_env'\n | 'not_found'\n | 'inference_failed'\n | 'unable_to_read_file'\n | 'invalid_syntax'\n | 'invalid_permissions'\n | 'unsupported_operation'\n | 'unsupported_validation_env'\n | 'unsupported_version';\n packageJson:\n | 'missing_field_name'\n | 'unable_to_read_file'\n | 'invalid_permissions'\n | 'invalid_syntax';\n vercelJson:\n | 'missing_field_microfrontend_config_path'\n | 'unable_to_read_file'\n | 'invalid_permissions'\n | 'invalid_syntax';\n unknown: never;\n}\n\nexport type MicrofrontendErrorSource =\n | '@vercel/microfrontends'\n | '@vercel/microfrontends/next'\n | 'fs'\n | 'ajv';\n\nexport interface MicrofrontendErrorOptions<T extends MicrofrontendErrorType> {\n cause?: unknown;\n source?: MicrofrontendErrorSource;\n type?: T;\n subtype?: TypeToSubtype[T];\n}\n\ninterface HandleOptions {\n fileName?: string;\n}\n\nexport class MicrofrontendError<\n T extends MicrofrontendErrorType = 'unknown',\n> extends Error {\n public source: MicrofrontendErrorSource;\n public type: T;\n public subtype?: TypeToSubtype[T];\n\n constructor(message: string, opts?: MicrofrontendErrorOptions<T>) {\n super(message, { cause: opts?.cause });\n this.name = 'MicrofrontendsError';\n this.source = opts?.source ?? '@vercel/microfrontends';\n this.type = opts?.type ?? ('unknown' as T);\n this.subtype = opts?.subtype;\n Error.captureStackTrace(this, MicrofrontendError);\n }\n\n isKnown(): boolean {\n return this.type !== 'unknown';\n }\n\n isUnknown(): boolean {\n return !this.isKnown();\n }\n\n /**\n * Converts an error to a MicrofrontendsError.\n * @param original - The original error to convert.\n * @returns The converted MicrofrontendsError.\n */\n static convert(\n original: Error,\n opts?: HandleOptions,\n ): MicrofrontendError<MicrofrontendErrorType> {\n if (opts?.fileName) {\n const err = MicrofrontendError.convertFSError(original, opts.fileName);\n if (err) {\n return err;\n }\n }\n\n if (\n original.message.includes(\n 'Code generation from strings disallowed for this context',\n )\n ) {\n return new MicrofrontendError(original.message, {\n type: 'config',\n subtype: 'unsupported_validation_env',\n source: 'ajv',\n });\n }\n\n // unknown catch-all\n return new MicrofrontendError(original.message);\n }\n\n static convertFSError(\n original: Error,\n fileName: string,\n ): MicrofrontendError<MicrofrontendErrorType> | null {\n if (original instanceof Error && 'code' in original) {\n if (original.code === 'ENOENT') {\n return new MicrofrontendError(`Could not find \"${fileName}\"`, {\n type: 'config',\n subtype: 'unable_to_read_file',\n source: 'fs',\n });\n }\n if (original.code === 'EACCES') {\n return new MicrofrontendError(\n `Permission denied while accessing \"${fileName}\"`,\n {\n type: 'config',\n subtype: 'invalid_permissions',\n source: 'fs',\n },\n );\n }\n }\n\n if (original instanceof SyntaxError) {\n return new MicrofrontendError(\n `Failed to parse \"${fileName}\": Invalid JSON format.`,\n {\n type: 'config',\n subtype: 'invalid_syntax',\n source: 'fs',\n },\n );\n }\n\n return null;\n }\n\n /**\n * Handles an unknown error and returns a MicrofrontendsError instance.\n * @param err - The error to handle.\n * @returns A MicrofrontendsError instance.\n */\n static handle(\n err: unknown,\n opts?: HandleOptions,\n ): MicrofrontendError<MicrofrontendErrorType> {\n if (err instanceof MicrofrontendError) {\n return err as MicrofrontendError<MicrofrontendErrorType>;\n }\n\n // handle Error instances\n if (err instanceof Error) {\n return MicrofrontendError.convert(err, opts);\n }\n\n // handle object errors\n if (typeof err === 'object' && err !== null) {\n if ('message' in err && typeof err.message === 'string') {\n return MicrofrontendError.convert(new Error(err.message), opts);\n }\n }\n\n return new MicrofrontendError('An unknown error occurred');\n }\n}\n","import { MicrofrontendError } from '../../errors';\n\n/**\n * Utility to fetch the microfrontend configuration string from the environment.\n */\nexport function getConfigStringFromEnv(): string {\n const config = process.env.MFE_CONFIG;\n if (!config) {\n throw new MicrofrontendError(`Missing \"MFE_CONFIG\" in environment.`, {\n type: 'config',\n subtype: 'not_found_in_env',\n });\n }\n return config;\n}\n","import type { Application, DefaultApplication } from '../types';\n\nexport function isDefaultApp(a: Application): a is DefaultApplication {\n return !('routing' in a);\n}\n","// cookie name needs to match proxy\n// https://github.com/vercel/proxy/blob/fb00d723136ad539a194e4a851dd272010527c35/lib/routing/micro_frontends_overrides.lua#L7\nexport const OVERRIDES_COOKIE_PREFIX = 'vercel-micro-frontends-override';\nexport const OVERRIDES_ENV_COOKIE_PREFIX = `${OVERRIDES_COOKIE_PREFIX}:env:`;\n","import { OVERRIDES_COOKIE_PREFIX } from './constants';\n\nexport function isOverrideCookie(cookie: { name?: string }): boolean {\n return Boolean(cookie.name?.startsWith(OVERRIDES_COOKIE_PREFIX));\n}\n","import { isOverrideCookie } from './is-override-cookie';\nimport { OVERRIDES_ENV_COOKIE_PREFIX } from './constants';\n\nexport function getOverrideFromCookie(cookie: {\n name: string;\n value?: string | null;\n}): { application: string; host: string } | undefined {\n if (!isOverrideCookie(cookie) || !cookie.value) return;\n return {\n application: cookie.name.replace(OVERRIDES_ENV_COOKIE_PREFIX, ''),\n host: cookie.value,\n };\n}\n","import type { OverridesConfig } from './types';\nimport { getOverrideFromCookie } from './get-override-from-cookie';\n\nexport function parseOverrides(\n cookies: { name: string; value?: string | null }[],\n): OverridesConfig {\n const overridesConfig: OverridesConfig = { applications: {} };\n\n cookies.forEach((cookie) => {\n const override = getOverrideFromCookie(cookie);\n if (!override) return;\n overridesConfig.applications[override.application] = {\n environment: { host: override.host },\n };\n });\n\n return overridesConfig;\n}\n","import { pathToRegexp, parse as parsePathRegexp } from 'path-to-regexp';\nimport type {\n ApplicationId,\n PathGroup,\n ApplicationRouting,\n ChildApplication as ChildApplicationConfig,\n} from '../../schema/types';\nimport { MicrofrontendError } from '../../errors';\nimport { isDefaultApp } from '../../schema/utils/is-default-app';\n\nconst LIST_FORMATTER = new Intl.ListFormat('en', {\n style: 'long',\n type: 'conjunction',\n});\n\n/**\n * Validate all paths in a configuration - ensures paths do not overlap\n */\nexport const validateConfigPaths = (\n applicationConfigsById?: ApplicationRouting,\n): void => {\n if (!applicationConfigsById) {\n return;\n }\n\n const pathsByApplicationId = new Map<\n PathGroup['paths'][number],\n {\n applications: ApplicationId[];\n matcher: RegExp;\n applicationId?: ApplicationId;\n }\n >();\n const errors: string[] = [];\n\n for (const [id, app] of Object.entries(applicationConfigsById)) {\n if (isDefaultApp(app)) {\n // default applications do not have routing\n continue;\n }\n\n for (const pathMatch of app.routing) {\n for (const path of pathMatch.paths) {\n const maybeError = validatePathExpression(path);\n if (maybeError) {\n errors.push(maybeError);\n } else {\n const existing = pathsByApplicationId.get(path);\n if (existing) {\n existing.applications.push(id);\n } else {\n pathsByApplicationId.set(path, {\n applications: [id],\n matcher: pathToRegexp(path),\n applicationId: id,\n });\n }\n }\n }\n }\n }\n const entries = Array.from(pathsByApplicationId.entries());\n\n for (const [path, { applications: ids, matcher, applicationId }] of entries) {\n if (ids.length > 1) {\n errors.push(\n `Duplicate path \"${path}\" for applications \"${ids.join(', ')}\"`,\n );\n }\n\n for (const [\n matchPath,\n { applications: matchIds, applicationId: matchApplicationId },\n ] of entries) {\n if (path === matchPath) {\n // we're comparing to ourselves, so skip\n continue;\n }\n\n if (applicationId === matchApplicationId) {\n // we're comparing to paths within our own application, which are allowed to overlap, so skip\n continue;\n }\n\n if (matcher.test(matchPath)) {\n const source = `\"${path}\" of application${ids.length > 0 ? 's' : ''} ${ids.join(', ')}`;\n const destination = `\"${matchPath}\" of application${matchIds.length > 0 ? 's' : ''} ${matchIds.join(', ')}`;\n\n errors.push(\n `Overlapping path detected between ${source} and ${destination}`,\n );\n }\n }\n }\n\n if (errors.length) {\n throw new MicrofrontendError(\n `Invalid paths: ${errors.join(', ')}. See supported paths in the documentation https://vercel.com/docs/microfrontends/path-routing#supported-path-expressions.`,\n {\n type: 'config',\n subtype: 'conflicting_paths',\n },\n );\n }\n};\n\n// From https://github.com/pillarjs/path-to-regexp/blob/b0778f5e8e6c6e9ee4e2f5b34e877cc5229f8036/src/index.ts#L143\nconst PATH_DEFAULT_PATTERN = '[^\\\\/#\\\\?]+?';\n\nfunction validatePathExpression(path: string): string | undefined {\n try {\n const tokens = parsePathRegexp(path);\n if (/(?<!\\\\)\\{/.test(path)) {\n return `Optional paths are not supported: ${path}`;\n }\n if (/(?<!\\\\|\\()\\?/.test(path)) {\n return `Optional paths are not supported: ${path}`;\n }\n if (/\\/[^/]*(?<!\\\\):[^/]*(?<!\\\\):[^/]*/.test(path)) {\n return `Only one wildcard is allowed per path segment: ${path}`;\n }\n for (let i = 0; i < tokens.length; i++) {\n const token = tokens[i];\n if (token === undefined) {\n return `token ${i} in ${path} is undefined, this shouldn't happen`;\n }\n if (typeof token !== 'string') {\n if (!token.name) {\n return `Only named wildcards are allowed: ${path} (hint: add \":path\" to the wildcard)`;\n }\n if (\n token.pattern !== PATH_DEFAULT_PATTERN &&\n // Allows (a|b|c) and ((?!a|b|c).*) regex\n // Only limited regex is supported for now, due to performance considerations\n !/^(?<allowed>[\\w]+(?:\\|[^:|()]+)+)$|^\\(\\?!(?<disallowed>[\\w]+(?:\\|[^:|()]+)*)\\)\\.\\*$/.test(\n token.pattern,\n )\n ) {\n return `Path ${path} cannot use unsupported regular expression wildcard`;\n }\n if (token.modifier && i !== tokens.length - 1) {\n return `Modifier ${token.modifier} is not allowed on wildcard :${token.name} in ${path}. 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'localhost',\n port: port ?? generatePortFromName({ name: appName }),\n });\n }\n}\n","export function generateAutomationBypassEnvVarName({\n name,\n}: {\n name: string;\n}): string {\n return `AUTOMATION_BYPASS_${name.toUpperCase().replace(/[^a-zA-Z0-9]/g, '_')}`;\n}\n","import type {\n Application as ApplicationConfig,\n DefaultApplication as DefaultApplicationConfig,\n ChildApplication as ChildApplicationConfig,\n PathGroup,\n} from '../../schema/types';\nimport type { ApplicationOverrideConfig } from '../../overrides';\nimport { validateAppPaths } from './validation';\nimport { generateAssetPrefixFromName } from './utils/generate-asset-prefix';\nimport { Host, LocalHost } from './host';\nimport { generateAutomationBypassEnvVarName } from './utils/generate-automation-bypass-env-var-name';\n\nexport class Application {\n readonly default: boolean;\n name: string;\n development: {\n local: LocalHost;\n fallback?: Host;\n };\n fallback?: Host;\n packageName?: string;\n overrides?: {\n environment?: Host;\n };\n readonly serialized: ApplicationConfig;\n\n constructor(\n name: string,\n {\n app,\n overrides,\n isDefault,\n }: {\n app: ApplicationConfig;\n overrides?: ApplicationOverrideConfig;\n isDefault?: boolean;\n },\n ) {\n this.name = name;\n this.development = {\n local: new LocalHost({\n appName: name,\n local: app.development?.local,\n }),\n fallback: app.development?.fallback\n ? new Host(app.development.fallback)\n : undefined,\n };\n if (app.development?.fallback) {\n this.fallback = new Host(app.development.fallback);\n }\n this.packageName = app.packageName;\n this.overrides = overrides?.environment\n ? {\n environment: new Host(overrides.environment),\n }\n : undefined;\n this.default = isDefault ?? false;\n this.serialized = app;\n }\n\n isDefault(): boolean {\n return this.default;\n }\n\n getAssetPrefix(): string {\n return generateAssetPrefixFromName({ name: this.name });\n }\n\n getAutomationBypassEnvVarName(): string {\n return generateAutomationBypassEnvVarName({ name: this.name });\n }\n\n serialize(): ApplicationConfig {\n return this.serialized;\n }\n}\n\nexport class DefaultApplication extends Application {\n readonly default = true;\n fallback: Host;\n\n constructor(\n name: string,\n {\n app,\n overrides,\n }: {\n app: DefaultApplicationConfig;\n overrides?: ApplicationOverrideConfig;\n },\n ) {\n super(name, {\n app,\n overrides,\n isDefault: true,\n });\n\n this.fallback = new Host(app.development.fallback);\n }\n\n getAssetPrefix(): string {\n return '';\n }\n}\n\nexport class ChildApplication extends Application {\n readonly default = false;\n routing: PathGroup[];\n\n constructor(\n name: string,\n {\n app,\n overrides,\n }: {\n app: ChildApplicationConfig;\n overrides?: ApplicationOverrideConfig;\n },\n ) {\n // validate\n ChildApplication.validate(name, app);\n\n super(name, {\n app,\n overrides,\n isDefault: false,\n });\n\n this.routing = app.routing;\n }\n\n static validate(name: string, app: ChildApplicationConfig): void {\n // validate routes\n validateAppPaths(name, app);\n }\n}\n","export const DEFAULT_LOCAL_PROXY_PORT = 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