polish isomorphic path module

packages/next/lib/constants.ts

@@ -1,6 +1,4 @@
-import path from '../shared/lib/isomorphic/path'
-
-const { join } = path
+import { join } from '../shared/lib/isomorphic/path'
 
 export const NEXT_PROJECT_ROOT = join(__dirname, '..', '..')
 export const NEXT_PROJECT_ROOT_DIST = join(NEXT_PROJECT_ROOT, 'dist')

packages/next/server/base-server.ts

@@ -17,7 +17,7 @@ import type { PagesManifest } from '../build/webpack/plugins/pages-manifest-plug
 import type { BaseNextRequest, BaseNextResponse } from './base-http'
 import type { PayloadOptions } from './send-payload'
 
-import pathMod from '../shared/lib/isomorphic/path'
+import { join, resolve } from '../shared/lib/isomorphic/path'
 import { parse as parseQs } from 'querystring'
 import { format as formatUrl, parse as parseUrl } from 'url'
 import { getRedirectStatus } from '../lib/load-custom-routes'
@@ -66,8 +66,6 @@ import { PrerenderManifest } from '../build'
 import { ImageConfigComplete } from '../shared/lib/image-config'
 import { replaceBasePath } from './router-utils'
 
-const { join, resolve } = pathMod
-
 export type FindComponentsResult = {
   components: LoadComponentsReturnType
   query: NextParsedUrlQuery

packages/next/server/normalize-page-path.ts

@@ -1,8 +1,6 @@
-import path from '../shared/lib/isomorphic/path'
+import { posix } from '../shared/lib/isomorphic/path'
 import { isDynamicRoute } from '../shared/lib/router/utils'
 
-const { posix } = path
-
 export { normalizePathSep, denormalizePagePath } from './denormalize-page-path'
 
 export function normalizePagePath(page: string): string {

packages/next/shared/lib/isomorphic/path.d.ts

@@ -0,0 +1,3 @@
+import m from 'path'
+
+export = m

packages/next/shared/lib/isomorphic/path.js

@@ -0,0 +1,12 @@
+/**
+ * This module is for next.js server internal usage of path module.
+ * It will use native path module for nodejs runtime.
+ * It will use path-browserify polyfill for edge runtime.
+ */
+
+const path =
+  process.env.NEXT_RUNTIME === 'edge'
+    ? require('next/dist/compiled/path-browserify')
+    : require('path')
+
+module.exports = path

packages/next/types/misc.d.ts

@@ -340,11 +340,6 @@ declare module 'next/dist/compiled/process' {
   export = m
 }
 
-declare module 'next/dist/compiled/path-browserify' {
-  import m from 'path'
-  export = m
-}
-
 declare module 'pnp-webpack-plugin' {
   import webpack from 'webpack4'