/**
 * Attach a tag to a value and return the value's current tags. Primitives are
 * keyed by value (all equal primitives share tags); objects by reference.
 */
export declare function _tag(value: unknown, key: string, val: unknown): Record<string, unknown>;
/**
 * Attach every key/value in `tags` to `value`, then return its current tags.
 */
export declare function _setTags(value: unknown, tags: Record<string, unknown>): Record<string, unknown>;
/** Return a shallow copy of a value's tags, or {} if none. */
export declare function _getTags(value: unknown): Record<string, unknown>;
/** Mark a value for statelog redaction and return its current tags. */
export declare function _redact(value: unknown): Record<string, unknown>;
/** Remove a single tag from a value and return its remaining tags. */
export declare function _removeTag(value: unknown, key: string): Record<string, unknown>;
/** Remove all tags from a value and return the (now empty) tags. */
export declare function _removeAllTags(value: unknown): Record<string, unknown>;