fix: import server in module scope (#363)

* fix: import server in module scope

* chore: rmeove comment

src/run/handlers/server.ts

@@ -18,6 +18,8 @@ import { logger } from '../systemlog.js'
 import { createRequestContext, getRequestContext } from './request-context.cjs'
 import { getTracer } from './tracer.cjs'
 
+const nextImportPromise = import('../next.cjs')
+
 let nextHandler: WorkerRequestHandler, nextConfig: NextConfigComplete, tagsManifest: TagsManifest
 
 /**
@@ -63,7 +65,7 @@ export default async (request: Request) => {
         ),
       )
 
-      const { getMockedRequestHandlers } = await import('../next.cjs')
+      const { getMockedRequestHandlers } = await nextImportPromise
       const url = new URL(request.url)
 
       ;[nextHandler] = await getMockedRequestHandlers({

src/run/next.cts

@@ -4,18 +4,22 @@ import { relative, resolve } from 'path'
 import { getDeployStore } from '@netlify/blobs'
 // @ts-expect-error no types installed
 import { patchFs } from 'fs-monkey'
-import type { getRequestHandlers as GetRequestHandlersSignature } from 'next/dist/server/lib/start-server.js'
 
 import { getRequestContext } from './handlers/request-context.cjs'
 import { getTracer } from './handlers/tracer.cjs'
 
+console.time('import next server')
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const { getRequestHandlers } = require('next/dist/server/lib/start-server.js')
+
+console.timeEnd('import next server')
+
 type FS = typeof import('fs')
 
 const fetchBeforeNextPatchedIt = globalThis.fetch
 
-export async function getMockedRequestHandlers(
-  ...args: Parameters<typeof GetRequestHandlersSignature>
-) {
+export async function getMockedRequestHandlers(...args: Parameters<typeof getRequestHandlers>) {
   const tracer = getTracer()
   return tracer.withActiveSpan('mocked request handler', async () => {
     const ofs = { ...fs }
@@ -57,11 +61,6 @@ export async function getMockedRequestHandlers(
       require('fs').promises,
     )
 
-    const { getRequestHandlers } = await tracer.withActiveSpan(
-      'import next server',
-      async () => import('next/dist/server/lib/start-server.js'),
-    )
-
     return getRequestHandlers(...args)
   })
 }