diff --git a/src/Sekiban.Infrastructure.IndexedDb/Runtime/Runtime.code-workspace b/src/Sekiban.Infrastructure.IndexedDb/Runtime/Runtime.code-workspace
index 0bca7b3c..a56b5182 100644
--- a/src/Sekiban.Infrastructure.IndexedDb/Runtime/Runtime.code-workspace
+++ b/src/Sekiban.Infrastructure.IndexedDb/Runtime/Runtime.code-workspace
@@ -13,6 +13,14 @@
       "editor.defaultFormatter": "biomejs.biome",
       "editor.formatOnSave": true,
     },
+    "[javascript]": {
+      "editor.codeActionsOnSave": {
+        "source.fixAll": "explicit",
+        "source.organizeImports": "explicit",
+      },
+      "editor.defaultFormatter": "biomejs.biome",
+      "editor.formatOnSave": true,
+    },
     "[json]": {
       "editor.defaultFormatter": "vscode.json-language-features",
     },
diff --git a/src/Sekiban.Infrastructure.IndexedDb/Runtime/build.js b/src/Sekiban.Infrastructure.IndexedDb/Runtime/build.js
new file mode 100644
index 00000000..a0d52d98
--- /dev/null
+++ b/src/Sekiban.Infrastructure.IndexedDb/Runtime/build.js
@@ -0,0 +1,67 @@
+// @ts-check
+
+import child_process from "node:child_process";
+import fs from "node:fs/promises";
+import process from "node:process";
+
+const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
+
+const obtainLock = async () => {
+	try {
+		await fs.mkdir("build-lock");
+		return true;
+	} catch (e) {
+		if (e.code === "EEXIST") {
+			return false;
+		}
+
+		throw new Error(e.message, { cause: e });
+	}
+};
+
+const releaseLock = async () => await fs.rmdir("build-lock");
+
+const waitAnotherBuild = async () => {
+	while (true) {
+		await sleep(1000);
+
+		try {
+			await fs.stat("build-lock");
+		} catch (e) {
+			if (e.code === "ENOENT") {
+				return;
+			}
+
+			throw new Error(e.message, { cause: e });
+		}
+	}
+};
+
+const main = async () => {
+	if (!(await obtainLock())) {
+		// An another build task is running concurrently.
+		// Wait until it done.
+		await waitAnotherBuild();
+		process.exit(0);
+	}
+
+	try {
+		const restore = child_process.spawnSync("npm", ["install"], {
+			stdio: "inherit",
+		});
+		if (restore.status !== 0) {
+			process.exit(restore.status);
+		}
+
+		const build = child_process.spawnSync("npm", ["run", "build"], {
+			stdio: "inherit",
+		});
+		if (build.status !== 0) {
+			process.exit(build.status);
+		}
+	} finally {
+		await releaseLock();
+	}
+};
+
+main();
diff --git a/src/Sekiban.Infrastructure.IndexedDb/Sekiban.Infrastructure.IndexedDb.csproj b/src/Sekiban.Infrastructure.IndexedDb/Sekiban.Infrastructure.IndexedDb.csproj
index 3a004aee..ef2908c1 100644
--- a/src/Sekiban.Infrastructure.IndexedDb/Sekiban.Infrastructure.IndexedDb.csproj
+++ b/src/Sekiban.Infrastructure.IndexedDb/Sekiban.Infrastructure.IndexedDb.csproj
@@ -40,9 +40,8 @@
     <None Include="..\README.md" Pack="true" PackagePath="\"/>
   </ItemGroup>
 
-  <Target Name="Build runtime" BeforeTargets="DispatchToInnerBuilds">
-    <Exec Command="npm install" WorkingDirectory="Runtime" />
-    <Exec Command="npm run build" WorkingDirectory="Runtime" />
+  <Target Name="Build runtime" BeforeTargets="BeforeBuild">
+    <Exec Command="node build.js" WorkingDirectory="Runtime" />
   </Target>
 
 </Project>