diff --git a/pkgs/webview-ui/app/prettier.config.js b/pkgs/webview-ui/app/prettier.config.js
new file mode 100644
index 000000000..2aa318a4a
--- /dev/null
+++ b/pkgs/webview-ui/app/prettier.config.js
@@ -0,0 +1,9 @@
+/**
+ * @see https://prettier.io/docs/en/configuration.html
+ * @type {import("prettier").Config}
+ */
+const config = {
+  trailingComma: "all",
+};
+
+export default config;