/**
 * Converts an object payload into `FormData`.
 *
 * Supports single files, file arrays, primitive values, dates, and nested
 * objects. Arrays are appended as repeated fields with the same key.
 *
 * @throws {Error} when `FormData` is unavailable in the current runtime.
 */
export declare function toFormData<T extends object>(payload: T): FormData;
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