/**
 * Flattens the given object.
 * e.g. `{ a: { b: { c: 42 } } }` becomes `{ 'a.b.c': 42 }`
 */
export declare function flatten(obj: unknown): Record<string, unknown>;
/**
 * Checks whether the given object has any properties.
 */
export declare function isEmptyObject(obj: unknown): boolean;
/**
 * Recursively removes all properties with an empty object or array as its value from the given object.
 */
export declare function removeEmptyObjects(obj: Record<string, unknown>): void;
/**
 * Recursively removes all properties with `undefined` as its value from the given object.
 */
export declare function removeUndefinedProperties(obj: Record<string, unknown>): void;
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