@vercel/microfrontends/dist/next/client.cjs.map

Defines configuration and utilities for microfrontends development

{"version":3,"sources":["../../src/next/client/index.ts","../../src/next/client/link/microfrontends-link.tsx","../../src/config/react/use-client-config.ts","../../src/config/microfrontends-config/client/index.ts","../../src/next/client/prefetch/prefetch-cross-zone-links-context.tsx","../../src/next/client/prefetch/prefetch-cross-zone-links.tsx"],"sourcesContent":["export * from './link';\nexport * from './prefetch';\n","import type { AnchorHTMLAttributes } from 'react';\nimport { forwardRef, useContext, useMemo } from 'react';\nimport NextLink, {\n  type LinkProps as ExternalNextLinkProps,\n} from 'next/link.js';\nimport { useClientConfig } from '../../../config/react/use-client-config';\nimport { PrefetchCrossZoneLinksContext } from '../prefetch';\n\ninterface BaseProps {\n  children: React.ReactNode;\n  href: string;\n}\n\n// fix for tsc inlining LinkProps from next\n// https://github.com/microsoft/TypeScript/issues/37151#issuecomment-756232934\n// eslint-disable-next-line @typescript-eslint/no-empty-interface\ninterface NextLinkProps extends ExternalNextLinkProps {}\nexport type LinkProps = BaseProps &\n  Omit<NextLinkProps, keyof BaseProps> &\n  Omit<AnchorHTMLAttributes<HTMLAnchorElement>, keyof BaseProps>;\n\nconst CURRENT_ZONE = process.env.NEXT_PUBLIC_MFE_CURRENT_APPLICATION;\n\nexport function useZoneForHref(href: LinkProps['href'] | undefined): {\n  zoneOfHref: string | null;\n  isDifferentZone: boolean;\n  isLoading: boolean;\n} {\n  const { clientConfig, isLoading } = useClientConfig(\n    process.env.NEXT_PUBLIC_MFE_CLIENT_CONFIG,\n    {\n      removeFlaggedPathsFromDefault: true,\n    },\n  );\n  const { isRelativePath, zoneOfHref } = useMemo(() => {\n    const isRelative = typeof href === 'string' && href.startsWith('/');\n    return {\n      isRelativePath: isRelative,\n      zoneOfHref: isRelative\n        ? clientConfig.getApplicationNameForPath(href)\n        : null,\n    };\n  }, [clientConfig, href]);\n\n  if (typeof href === 'string' && !href.length) {\n    return {\n      zoneOfHref: null,\n      isDifferentZone: false,\n      isLoading: false,\n    };\n  }\n  const isDifferentZone =\n    !isRelativePath || (zoneOfHref ? CURRENT_ZONE !== zoneOfHref : false);\n  return { zoneOfHref, isDifferentZone, isLoading };\n}\n\n/**\n * A Link component that works with microfrontend set-ups and will prefetch the\n * cross zone links automatically.\n */\nexport const Link = forwardRef<HTMLAnchorElement, LinkProps>(\n  ({ children, ...props }, ref): JSX.Element => {\n    const { prefetchHref } = useContext(PrefetchCrossZoneLinksContext);\n    const { zoneOfHref, isDifferentZone, isLoading } = useZoneForHref(\n      props.href,\n    );\n\n    function onHoverPrefetch(): void {\n      if (!props.href) {\n        return;\n      }\n      prefetchHref(props.href);\n    }\n\n    if (isDifferentZone && zoneOfHref !== null) {\n      const { prefetch: _, ...rest } = props;\n      return (\n        <a\n          {...rest}\n          data-zone={zoneOfHref}\n          onFocus={props.prefetch !== false ? onHoverPrefetch : undefined}\n          onMouseOver={props.prefetch !== false ? onHoverPrefetch : undefined}\n        >\n          {children}\n        </a>\n      );\n    }\n\n    return (\n      <NextLink\n        {...props}\n        data-zone={!zoneOfHref ? 'null' : 'same'}\n        prefetch={props.prefetch ?? (isLoading ? false : undefined)}\n        ref={ref}\n      >\n        {children}\n      </NextLink>\n    );\n  },\n);\nLink.displayName = 'MicrofrontendsLink';\n","'use client';\n\nimport { useState, useEffect, useMemo } from 'react';\nimport type { WellKnownClientData } from '../well-known/types';\nimport { MicrofrontendConfigClient } from '../microfrontends-config/client';\nimport type { MicrofrontendConfigClientOptions } from '../microfrontends-config/client';\n\nconst clientCache = new Map<string, Map<string, MicrofrontendConfigClient>>();\nconst cachedHasDynamicPaths = new Map<string, boolean>();\n\nconst getOptsKey = (opts?: MicrofrontendConfigClientOptions): string => {\n  return JSON.stringify({\n    removeFlaggedPaths: opts?.removeFlaggedPaths || false,\n  });\n};\n\nconst getClient = (\n  config: string | undefined,\n  opts?: MicrofrontendConfigClientOptions,\n) => {\n  const optsKey = getOptsKey(opts);\n  let configCache = clientCache.get(config || '');\n  if (!configCache) {\n    configCache = new Map();\n    clientCache.set(config || '', configCache);\n  } else {\n    const existing = configCache.get(optsKey);\n    if (existing) {\n      return existing;\n    }\n  }\n\n  const client = MicrofrontendConfigClient.fromEnv(config, opts);\n  configCache.set(optsKey, client);\n  return client;\n};\n\nlet cachedServerClientConfigPromise: Promise<MicrofrontendConfigClient | null> | null =\n  null;\n\nlet cachedServerClient: MicrofrontendConfigClient | null = null;\n\nasync function fetchClientConfigFromServer(): Promise<MicrofrontendConfigClient | null> {\n  try {\n    const response = await fetch(\n      '/.well-known/vercel/microfrontends/client-config',\n    );\n    if (response.status !== 200) {\n      return null;\n    }\n    const responseJson = (await response.json()) as WellKnownClientData;\n    const client = new MicrofrontendConfigClient(responseJson.config);\n    cachedServerClient = client;\n    return client;\n  } catch (err) {\n    return null;\n  }\n}\n\n/**\n * Hook to use the client microfrontends configuration. This hook will resolve\n * dynamic paths by fetching the configuration from the server if necessary,\n * allowing the server to specify the values for dynamic paths.\n */\nexport function useClientConfig(\n  config: string | undefined,\n  {\n    removeFlaggedPathsFromDefault,\n  }: {\n    removeFlaggedPathsFromDefault?: boolean;\n  } = {},\n): {\n  clientConfig: MicrofrontendConfigClient;\n  isLoading: boolean;\n} {\n  const [clientConfig, setClientConfig] = useState<MicrofrontendConfigClient>(\n    () =>\n      cachedServerClient ??\n      getClient(config, {\n        removeFlaggedPaths: removeFlaggedPathsFromDefault,\n      }),\n  );\n  const canLoad = useMemo(() => {\n    if (\n      process.env.NODE_ENV === 'test' &&\n      process.env.MFE_FORCE_CLIENT_CONFIG_FROM_SERVER !== '1'\n    ) {\n      return false;\n    }\n    // If we've already fetched the server config and it's resolved, we don't need\n    // to enter the loading state at all\n    if (cachedServerClient) return false;\n    // If we've already checked this config for dynamic paths, we can use the\n    // cached result from before instead of reevaluating.\n    const existing = cachedHasDynamicPaths.get(config || '');\n    if (existing !== undefined) return existing;\n    // Since we may remove flagged paths from the client config above, we need\n    // to use the original client config to determine if the config has any\n    // dynamic paths.\n    const originalClientConfig = getClient(config);\n    // As an optimization, only fetch the config from the server if the\n    // microfrontends configuration has any dynamic paths. If it doesn't,\n    // then the server won't return any different values.\n    const hasDynamicPaths = Object.values(\n      originalClientConfig.applications,\n    ).some((app) => app.routing?.some((group) => group.flag));\n    cachedHasDynamicPaths.set(config || '', hasDynamicPaths);\n    if (!hasDynamicPaths) {\n      return false;\n    }\n    return true;\n  }, [config]);\n  const [isLoading, setIsLoading] = useState(canLoad);\n  useEffect(() => {\n    if (!canLoad) return;\n    if (!cachedServerClientConfigPromise) {\n      cachedServerClientConfigPromise = fetchClientConfigFromServer();\n    }\n    void cachedServerClientConfigPromise\n      .then((newConfig) => {\n        if (newConfig) {\n          setClientConfig((prevConfig) => {\n            return prevConfig.isEqual(newConfig) ? prevConfig : newConfig;\n          });\n        }\n      })\n      .finally(() => {\n        setIsLoading(false);\n      });\n  }, [config, clientConfig.applications, canLoad]);\n\n  return { clientConfig, isLoading };\n}\n\nexport function resetCachedServerClientConfigPromise(): void {\n  cachedServerClientConfigPromise = null;\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 React, {\n  createContext,\n  useCallback,\n  useRef,\n  useMemo,\n  useState,\n  startTransition,\n} from 'react';\n\nexport interface PrefetchCrossZoneLinksContext {\n  prefetchHref: (href: string) => void;\n}\n\nexport const PrefetchCrossZoneLinksContext =\n  createContext<PrefetchCrossZoneLinksContext>({\n    // eslint-disable-next-line @typescript-eslint/no-empty-function\n    prefetchHref: () => {},\n  });\n\nexport function PrefetchCrossZoneLinksProvider({\n  children,\n}: {\n  children: React.ReactNode;\n}): JSX.Element | null {\n  const [seenHrefs, setSeenHrefs] = useState(new Set<string>());\n  const isSafariOrFirefox = useRef(\n    typeof navigator !== 'undefined' &&\n      (navigator.userAgent.includes('Firefox') ||\n        (navigator.userAgent.includes('Safari') &&\n          !navigator.userAgent.includes('Chrome'))),\n  );\n\n  // This useCallback must not have any dependencies because if it changes\n  // its value, every component that uses this context will rerender.\n  const prefetchHref = useCallback((href: string): void => {\n    // It's not critical that we render the new preload `<link>` elements\n    // immediately. We want to batch together `prefetchHref` calls that\n    // occur in one synchronous pass and only render once after they've all\n    // called this callback.\n    startTransition(() => {\n      setSeenHrefs((prevHrefs) => {\n        if (prevHrefs.has(href)) return prevHrefs;\n        return new Set(prevHrefs).add(href);\n      });\n    });\n  }, []);\n\n  const value = useMemo(() => ({ prefetchHref }), [prefetchHref]);\n\n  if (!isSafariOrFirefox.current) {\n    return <>{children}</>;\n  }\n\n  return (\n    <PrefetchCrossZoneLinksContext.Provider value={value}>\n      {children}\n      {[...seenHrefs].map((href) => (\n        <link as=\"fetch\" href={href} key={href} rel=\"preload\" />\n      ))}\n    </PrefetchCrossZoneLinksContext.Provider>\n  );\n}\n","import { useEffect, useState } from 'react';\nimport Script from 'next/script.js';\nimport { useClientConfig } from '../../../config/react/use-client-config';\n\nconst PREFETCH_ATTR = 'data-prefetch';\nconst DATA_ATTR_SELECTORS = {\n  anyZone: '[data-zone]',\n  external: '[data-zone=\"null\"]',\n  sameZone: '[data-zone=\"same\"]',\n  prefetch: `[${PREFETCH_ATTR}]`,\n} as const;\n\nconst PREFETCH_ON_HOVER_PREDICATES = {\n  and: [\n    { href_matches: '/*' },\n    { selector_matches: DATA_ATTR_SELECTORS.anyZone },\n    { not: { selector_matches: DATA_ATTR_SELECTORS.sameZone } },\n    { not: { selector_matches: DATA_ATTR_SELECTORS.external } },\n  ],\n};\n\nconst PREFETCH_WHEN_VISIBLE_PREDICATES = {\n  and: [\n    { href_matches: '/*' },\n    { selector_matches: DATA_ATTR_SELECTORS.anyZone },\n    { not: { selector_matches: DATA_ATTR_SELECTORS.sameZone } },\n    { not: { selector_matches: DATA_ATTR_SELECTORS.external } },\n    { selector_matches: DATA_ATTR_SELECTORS.prefetch },\n  ],\n};\n\nfunction checkVisibility(element: Element | null): boolean {\n  if (!element) return true;\n\n  if ('checkVisibility' in element) {\n    return element.checkVisibility({ opacityProperty: true });\n  }\n\n  // hack to get around TS thinking element is never;\n  const el = element as Element;\n  const style = window.getComputedStyle(el);\n\n  if (\n    style.display === 'none' ||\n    style.visibility === 'hidden' ||\n    style.opacity === '0'\n  ) {\n    return false;\n  }\n\n  return checkVisibility(el.parentElement);\n}\n\nexport function PrefetchCrossZoneLinks(): JSX.Element | null {\n  const { isLoading } = useClientConfig(\n    process.env.NEXT_PUBLIC_MFE_CLIENT_CONFIG,\n  );\n  const [links, setLinks] = useState<HTMLAnchorElement[]>([]);\n\n  useEffect(() => {\n    if (isLoading) {\n      return;\n    }\n\n    /**\n     * Intersection observer to add the data-prefetch attribute to cross-zone\n     * links that have yet to be prefetched and are visible.\n     */\n    const observer = new IntersectionObserver(\n      (entries) => {\n        entries.forEach((entry) => {\n          if (\n            entry.isIntersecting &&\n            !entry.target.hasAttribute(PREFETCH_ATTR) &&\n            // lazy perform the visibility check for nodes that are intersecting the viewport\n            // and have not been prefetched.\n            checkVisibility(entry.target)\n          ) {\n            entry.target.setAttribute(PREFETCH_ATTR, 'true');\n          }\n        });\n      },\n      {\n        root: null,\n        rootMargin: '0px',\n        threshold: 0.1,\n      },\n    );\n\n    links.forEach((link) => observer.observe(link));\n\n    return () => {\n      observer.disconnect();\n    };\n  }, [isLoading, links]);\n\n  useEffect(() => {\n    if (isLoading) {\n      return;\n    }\n\n    /**\n     * Mutation observer to notify when new nodes have entered/exited the document\n     * or an href has changed.\n     */\n    const observer = new MutationObserver((mutations) => {\n      const hasChanged = mutations.some((mutation) => {\n        return (\n          (mutation.type === 'childList' && mutation.addedNodes.length > 0) ||\n          (mutation.type === 'attributes' && mutation.attributeName === 'href')\n        );\n      });\n\n      if (hasChanged) {\n        // Whenever there's a change, add all cross-zone links that haven't been\n        // prefetched.\n        setLinks(\n          Array.from(\n            document.querySelectorAll<HTMLAnchorElement>(\n              `a${DATA_ATTR_SELECTORS.anyZone}:not(${DATA_ATTR_SELECTORS.prefetch}):not(${DATA_ATTR_SELECTORS.sameZone}):not(${DATA_ATTR_SELECTORS.external})`,\n            ),\n          ),\n        );\n      }\n    });\n\n    observer.observe(document.body, {\n      childList: true,\n      subtree: true,\n      attributes: true,\n      attributeFilter: ['href'],\n    });\n\n    return () => {\n      observer.disconnect();\n    };\n  }, [isLoading]);\n\n  // Wait till the zone-config loads to take into consideration any\n  // flagged routes.\n  if (isLoading) {\n    return null;\n  }\n\n  // Prefetch links with moderate eagerness by default, immediately when marked \"data-prefetch\".\n  // Prerender links with conservative eagerness by default, immediately when marked \"data-prefetch\".\n  const speculationRules = {\n    prefetch: [\n      {\n        eagerness: 'moderate',\n        where: PREFETCH_ON_HOVER_PREDICATES,\n      },\n      {\n        eagerness: 'immediate',\n        where: PREFETCH_WHEN_VISIBLE_PREDICATES,\n      },\n    ],\n    prerender: [\n      {\n        eagerness: 'conservative',\n        where: PREFETCH_ON_HOVER_PREDICATES,\n      },\n    ],\n  };\n\n  return (\n    <Script\n      dangerouslySetInnerHTML={{\n        __html: JSON.stringify(speculationRules),\n      }}\n      id=\"prefetch-zones-links\"\n      type=\"speculationrules\"\n    />\n  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