fix(core): tear down the compiler

.changeset/curly-groups-ask.md

@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes a bug where the Astro compiler wasn't freed at the end of the build. After the fix, the memory used by the compiler is now correctly freed at the end of the build.

packages/astro/src/core/build/index.ts

@@ -231,7 +231,6 @@ export class AstroBuilder {
 			runtimeMode: this.runtimeMode,
 			origin: this.origin,
 			pageNames,
-			teardownCompiler: this.teardownCompiler,
 			viteConfig,
 			key: keyPromise,
 		};
@@ -295,6 +294,15 @@ export class AstroBuilder {
 			this.settings.timer.end('Total build');
 			// Benchmark results
 			this.settings.timer.writeStats();
+
+			if (this.teardownCompiler) {
+				try {
+					const { teardown } = await import('@astrojs/compiler');
+					teardown();
+				} catch {
+					// Compiler teardown is best-effort — don't fail the build if it errors
+				}
+			}
 		}
 	}
 

packages/astro/src/core/build/types.ts

@@ -34,7 +34,6 @@ export interface StaticBuildOptions {
 	origin: string;
 	pageNames: string[];
 	viteConfig: InlineConfig;
-	teardownCompiler: boolean;
 	key: Promise<CryptoKey>;
 }