Function getDeploymentId

test/lib/next-test-utils.ts:2074–2105

(appDir: string, isDev: boolean)

  curRes.headers.get('x-nextjs-cache') || curRes.headers.get('x-vercel-cache')

export function getDeploymentId(appDir: string, isDev: boolean) {
  let requiredServerFiles
  if (!isDev) {
    // File isn't written in dev, but it might still exist because it was created by a prior
    // production build.
    try {
      requiredServerFiles = JSON.parse(
        readFileSync(
          path.join(appDir, getDistDir(), 'required-server-files.json'),
          'utf8'
        )
      )
    } catch {}
  }

  const deploymentId: string | undefined =
    requiredServerFiles?.config?.deploymentId
  const immutableAssetToken: string | undefined =
    requiredServerFiles?.config?.experimental?.immutableAssetToken
  const assetToken: string | undefined = immutableAssetToken || deploymentId

  return {
    deploymentId,
    getDeploymentIdQuery(ampersand = false) {
      return deploymentId ? `${ampersand ? '&' : '?'}dpl=${deploymentId}` : ''
    },
    assetToken,
    getAssetQuery(ampersand = false) {
      return assetToken ? `${ampersand ? '&' : '?'}dpl=${assetToken}` : ''
    },
  }
}