Create participants.ts

libs/@guardian/libs/src/consent-management-platform/lib/participants.ts

@@ -0,0 +1,23 @@
+import { isObject } from '../../isObject/isObject';
+import { isString } from '../../isString/isString';
+import { storage } from '../../storage/storage';
+
+export type Participations = Record<string, { variant: string }>;
+
+const participationsKey = 'gu.ab.participations';
+export const getParticipationsFromLocalStorage = (): Participations => {
+	const participations = storage.local.get(participationsKey);
+	return isParticipations(participations) ? participations : {};
+};
+
+const isParticipations = (
+	participations: unknown,
+): participations is Participations => {
+	return (
+		isObject(participations) &&
+		Object.values(participations).every(
+			(participation) =>
+				isObject(participation) && isString(participation.variant),
+		)
+	);
+};