Get rid of weird replacement in Webpack

Author: eps1lon

packages/next/src/build/define-env.ts

@@ -337,7 +337,6 @@ export function getDefineEnv({
       !isTurbopack || (config.experimental.turbopackPersistentCaching ?? false),
     'process.env.__NEXT_OPTIMIZE_ROUTER_SCROLL':
       config.experimental.optimizeRouterScrolling ?? false,
-    __next__clear_chunk_cache__: JSON.stringify(null),
   }
 
   const userDefines = config.compiler?.define ?? {}

packages/next/src/server/app-render/entry-base.ts

@@ -61,10 +61,16 @@ if (process.env.NODE_ENV === 'development') {
 // For hot-reloader
 declare global {
   var __next__clear_chunk_cache__: (() => void) | null | undefined
+  var __turbopack_clear_chunk_cache__: () => void | null | undefined
 }
 // hot-reloader modules are not bundled so we need to inject `__next__clear_chunk_cache__`
 // into globalThis from this file which is bundled.
-globalThis.__next__clear_chunk_cache__ = __next__clear_chunk_cache__
+if (process.env.TURBOPACK) {
+  globalThis.__next__clear_chunk_cache__ = __turbopack_clear_chunk_cache__
+} else {
+  // Webpack does not have chunks on the server
+  globalThis.__next__clear_chunk_cache__ = null
+}
 
 // patchFetch makes use of APIs such as `React.unstable_postpone` which are only available
 // in the experimental channel of React, so export it from here so that it comes from the bundled runtime

turbopack/crates/turbopack-ecmascript/src/runtime_functions.rs

@@ -111,5 +111,5 @@ pub const TURBOPACK_RUNTIME_FUNCTION_SHORTCUTS: [(&str, &TurbopackRuntimeFunctio
     ("__turbopack_refresh__", TURBOPACK_REFRESH),
     ("__turbopack_require_stub__", TURBOPACK_REQUIRE_STUB),
     ("__turbopack_require_real__", TURBOPACK_REQUIRE_REAL),
-    ("__next__clear_chunk_cache__", TURBOPACK_CLEAR_CHUNK_CACHE),
+    ("__turbopack_clear_chunk_cache__", TURBOPACK_CLEAR_CHUNK_CACHE),
 ];