1 files changed, 29 insertions, 0 deletions
diff --git a/packages/integrations/vercel/src/lib/speed-insights.ts b/packages/integrations/vercel/src/lib/speed-insights.ts
new file mode 100644
index 000000000..8e3639536
--- /dev/null
+++ b/packages/integrations/vercel/src/lib/speed-insights.ts
@@ -0,0 +1,29 @@
+export type VercelSpeedInsightsConfig = {
+	enabled: boolean;
+};
+
+export function getSpeedInsightsViteConfig(enabled?: boolean) {
+	if (enabled) {
+		return {
+			define: exposeEnv(['VERCEL_ANALYTICS_ID']),
+		};
+	}
+
+	return {};
+}
+
+/**
+ * While Vercel adds the `PUBLIC_` prefix for their `VERCEL_` env vars by default, some env vars
+ * like `VERCEL_ANALYTICS_ID` aren't, so handle them here so that it works correctly in runtime.
+ */
+export function exposeEnv(envs: string[]): Record<string, unknown> {
+	const mapped: Record<string, unknown> = {};
+
+	envs
+		.filter((env) => process.env[env])
+		.forEach((env) => {
+			mapped[`import.meta.env.PUBLIC_${env}`] = JSON.stringify(process.env[env]);
+		});
+
+	return mapped;
+}