Base JS runtime for builds

Currently we ship dev runtimes (with things like HMR logic) along with code for loading chunks. This separates them and allows us to include a minimal runtime for builds.

Test Plan: `TURBOPACK=1 TURBOPACK_BUILD=1 pnpm build` on an app with a `middleware.ts` and verified it loads when started.

turbopack/crates/turbopack-browser/src/ecmascript/evaluate/chunk.rs

@@ -147,6 +147,7 @@ impl EcmascriptDevEvaluateChunk {
                 let runtime_code = turbopack_ecmascript_runtime::get_browser_runtime_code(
                     environment,
                     chunking_context.chunk_base_path(),
+                    Value::new(chunking_context.runtime_type()),
                     Vc::cell(output_root.to_string().into()),
                 );
                 code.push_code(&*runtime_code.await?);
@@ -155,6 +156,7 @@ impl EcmascriptDevEvaluateChunk {
                 let runtime_code = turbopack_ecmascript_runtime::get_browser_runtime_code(
                     environment,
                     chunking_context.chunk_base_path(),
+                    Value::new(chunking_context.runtime_type()),
                     Vc::cell(output_root.to_string().into()),
                 );
                 code.push_code(&*runtime_code.await?);

turbopack/crates/turbopack-ecmascript-runtime/js/package.json

@@ -8,6 +8,9 @@
     "check": "run-p check:*",
     "check:nodejs": "tsc -p src/nodejs",
     "check:browser-dev-client": "tsc -p src/browser/dev/hmr-client",
+    "check:browser-runtime-base": "tsc -p src/browser/runtime/base",
+    "check:browser-runtime-dom": "tsc -p src/browser/runtime/dom",
+    "check:browser-runtime-edge": "tsc -p src/browser/runtime/edge",
     "check:browser-dev-runtime-base": "tsc -p src/browser/dev/runtime/base",
     "check:browser-dev-runtime-dom": "tsc -p src/browser/dev/runtime/dom",
     "check:browser-dev-runtime-edge": "tsc -p src/browser/dev/runtime/edge"

turbopack/crates/turbopack-ecmascript-runtime/js/src/browser/runtime/base/dummy.ts

@@ -0,0 +1,23 @@
+/**
+ * This file acts as a dummy implementor for the interface that
+ * `runtime-base.ts` expects to be available in the global scope.
+ *
+ * This interface will be implemented by runtime backends.
+ */
+
+/* eslint-disable @typescript-eslint/no-unused-vars */
+
+/// <reference path="../../../shared/runtime-utils.ts" />
+/// <reference path="../../../shared/require-type.d.ts" />
+
+declare var BACKEND: RuntimeBackend;
+declare var loadWebAssembly: (
+  source: SourceInfo,
+  wasmChunkPath: ChunkPath,
+  imports: WebAssembly.Imports
+) => Exports;
+declare var loadWebAssemblyModule: (
+  source: SourceInfo,
+  wasmChunkPath: ChunkPath
+) => WebAssembly.Module;
+declare var relativeURL: (inputUrl: string) => void;