The formatFetchParams function is a utility function that formats fetch parameters such as fields and filter into the format expected by the Statamic API.
const params = {
fields: ['title', 'content'],
filter: {
status: 'published',
},
};
const formattedParams = formatFetchParams(params);
// Returns: { fields: 'title,content', filter[status]: 'published' }
declare function formatFetchParams(params: Record<string, any>): Record<string, any>