Fix memory leak in dev server

dist/functions/bundler/dispose-bundler-contexts.d.ts

@@ -0,0 +1,6 @@
+/**
+ * Disposes the hydration and SSR esbuild contexts, releasing the incremental
+ * build state esbuild keeps in memory for them. The bundlers re-create the
+ * contexts on their next run.
+ */
+export default function disposeBundlerContexts(): Promise<void>;

dist/functions/bundler/dispose-bundler-contexts.js

@@ -0,0 +1,17 @@
+/**
+ * Disposes the hydration and SSR esbuild contexts, releasing the incremental
+ * build state esbuild keeps in memory for them. The bundlers re-create the
+ * contexts on their next run.
+ */
+export default async function disposeBundlerContexts() {
+    try {
+        await global.BUNEXT_BUNDLER_CTX?.dispose();
+    }
+    catch (error) { }
+    global.BUNEXT_BUNDLER_CTX = undefined;
+    try {
+        await global.BUNEXT_SSR_BUNDLER_CTX?.dispose();
+    }
+    catch (error) { }
+    global.BUNEXT_SSR_BUNDLER_CTX = undefined;
+}

dist/functions/bundler/pages-ssr-context-bundler.js

@@ -8,6 +8,7 @@ import grabRootFilePath from "../server/web-pages/grab-root-file-path";
 import ssrVirtualFilesPlugin from "./plugins/ssr-virtual-files-plugin";
 import ssrCTXArtifactTracker from "./plugins/ssr-ctx-artifact-tracker";
 import cleanupArtifacts from "../server/cleanup-artifacts";
+import { evictDeletedModules } from "../../utils/import-fresh";
 import { writeFileSync } from "fs";
 import path from "path";
 import { log } from "../../utils/log";
@@ -165,6 +166,9 @@ async function doSSRRebuild(params) {
         global.BUNEXT_SSR_BUNDLER_CTX_DISPOSED = false;
         global.BUNEXT_BUILD_FAILED = false;
         await cleanupArtifacts({ paradigm: "ssr" });
+        // esbuild has now replaced superseded outputs on disk; release the
+        // ones the server already imported.
+        evictDeletedModules(BUNX_CWD_MODULE_CACHE_DIR);
     }
     catch (error) {
         global.BUNEXT_SSR_BUNDLER_CTX_DISPOSED = true;