Add api validations.

lib/yup.ts

@@ -0,0 +1,19 @@
+import * as yup from 'yup';
+
+export function getDateRangeValidation() {
+  return {
+    startAt: yup.number().integer().required(),
+    endAt: yup.number().integer().moreThan(yup.ref('startAt')).required(),
+  };
+}
+
+// ex: /funnel|insights|retention/i
+export function getFilterValidation(matchRegex) {
+  return {
+    filter: yup.string(),
+    filterType: yup.string().matches(matchRegex),
+    pageSize: yup.number().integer().positive().max(200),
+    page: yup.number().integer().positive(),
+    orderBy: yup.string(),
+  };
+}