Function getFilesForRoute

packages/next/src/client/route-loader.ts:208–240

(
  assetPrefix: string,
  route: string
)

  css: string[]
}
function getFilesForRoute(
  assetPrefix: string,
  route: string
): Promise<RouteFiles> {
  if (process.env.NODE_ENV === 'development') {
    const scriptUrl =
      assetPrefix +
      '/_next/static/chunks/pages' +
      encodeURIPath(getAssetPathFromRoute(route, '.js')) +
      getAssetTokenQuery()
    return Promise.resolve({
      scripts: [__unsafeCreateTrustedScriptURL(scriptUrl)],
      // Styles are handled by `style-loader` in development:
      css: [],
    })
  }
  return getClientBuildManifest().then((manifest) => {
    if (!(route in manifest)) {
      throw markAssetError(new Error(`Failed to lookup route: ${route}`))
    }
    const allFiles = manifest[route].map(
      (entry) => assetPrefix + '/_next/' + encodeURIPath(entry)
    )
    return {
      scripts: allFiles
        .filter((v) => v.endsWith('.js'))
        .map((v) => __unsafeCreateTrustedScriptURL(v) + getAssetTokenQuery()),
      css: allFiles
        .filter((v) => v.endsWith('.css'))
        .map((v) => v + getAssetTokenQuery()),
    }
  })
}

export function createRouteLoader(assetPrefix: string): RouteLoader {
  const entrypoints: Map<string, Future<RouteEntrypoint> | RouteEntrypoint> =