wp-calypso/packages/data-stores/src/reader/helpers/query-key.ts

// change version to invalidate all cache keys
export const version = 'v1';

const buildQueryKey = (
	keyPrefix: ( number | string )[],
	isLoggedIn: boolean,
	userId?: number
) => {
	return [
		...keyPrefix,
		version,
		isLoggedIn ? 'logged-in' : 'not-logged-in',
		userId ? userId : '',
	];
};

export default buildQueryKey;