1 files changed, 32 insertions, 0 deletions
diff --git a/packages/integrations/web-vitals/src/schemas.ts b/packages/integrations/web-vitals/src/schemas.ts
new file mode 100644
index 000000000..7a2050bd5
--- /dev/null
+++ b/packages/integrations/web-vitals/src/schemas.ts
@@ -0,0 +1,32 @@
+import { z } from 'astro/zod';
+
+export const RatingSchema = z.enum(['good', 'needs-improvement', 'poor']);
+const MetricTypeSchema = z.enum(['CLS', 'INP', 'LCP', 'FCP', 'FID', 'TTFB']);
+
+/** `web-vitals` generated ID, transformed to reduce data resolution. */
+const MetricIdSchema = z
+	.string()
+	// Match https://github.com/GoogleChrome/web-vitals/blob/main/src/lib/generateUniqueID.ts
+	.regex(/^v3-\d{13}-\d{13}$/)
+	// Avoid collecting higher resolution timestamp in ID.
+	// Transforms `'v3-1711484350895-3748043125387'` to `'v3-17114843-3748043125387'`
+	.transform((id) => id.replace(/^(v3-\d{8})\d{5}(-\d{13})$/, '$1$2'));
+
+/** Shape of the data submitted from clients to the collection API. */
+const ClientMetricSchema = z.object({
+	pathname: z.string(),
+	route: z.string(),
+	name: MetricTypeSchema,
+	id: MetricIdSchema,
+	value: z.number().gte(0),
+	rating: RatingSchema,
+});
+
+/** Transformed client data with added timestamp. */
+export const ServerMetricSchema = ClientMetricSchema.transform((metric) => {
+	const timestamp = new Date();
+	timestamp.setMinutes(0, 0, 0);
+	return { ...metric, timestamp };
+});
+
+export type ClientMetric = z.input<typeof ClientMetricSchema>;