chore: use global rather than env in edge

Author: ascorbic

packages/runtime/src/templates/edge-shared/utils.ts

@@ -8,10 +8,7 @@ export interface FetchEventResult {
 
 type NextDataTransform = <T>(data: T) => T
 
-export const useEdgeRouter = () => {
-  const useEdge = Deno.env.get('NETLIFY_NEXT_EDGE_ROUTER')
-  return useEdge === 'true' || useEdge === '1'
-}
+export const useEdgeRouter = () => Boolean(globalThis.NETLIFY_NEXT_EDGE_ROUTER)
 
 /**
  * This is how Next handles rewritten URLs.

packages/runtime/src/templates/edge/router-pre-middleware.ts

@@ -3,7 +3,12 @@ import routesManifest from '../edge-shared/routes-manifest.json' assert { type:
 import { runPreMiddleware } from '../edge-shared/router.ts'
 import type { RoutesManifest } from '../edge-shared/next-utils.ts'
 
-Deno.env.set('NETLIFY_NEXT_EDGE_ROUTER', 'true')
+declare global {
+  // deno-lint-ignore no-var
+  var NETLIFY_NEXT_EDGE_ROUTER: boolean
+}
+
+globalThis.NETLIFY_NEXT_EDGE_ROUTER = true
 
 /**
  * Stage 1 routing