/**
* Removes all null fields and empty objects from an object recursively.
* Empty arrays are preserved as they carry semantic meaning (e.g., "no results found").
* This ensures that data sent to agents doesn't include unnecessary empty values.
*
* @param obj - The object to sanitize
* @returns A new object with all null fields and empty objects removed
*/
export function removeNullFields<T>(obj: T): T {
if (obj === null || obj === undefined) {
return obj
}
if (Array.isArray(obj)) {
return obj.map((item) => removeNullFields(item)) as T
}
if (typeof obj === 'object') {
const sanitized: Record<string, unknown> = {}
for (const [key, value] of Object.entries(obj)) {
if (value !== null) {
const cleanedValue = removeNullFields(value)
// Keep empty arrays - they indicate "no results" which is semantically meaningful
// Only skip empty objects
if (
cleanedValue !== null &&
typeof cleanedValue === 'object' &&
!Array.isArray(cleanedValue) &&
Object.keys(cleanedValue).length === 0
) {
continue
}
sanitized[key] = cleanedValue
}
}
return sanitized as T
}
return obj
}
