import type { FieldDescriptor } from './types.js';
/** Field keys marked `.traceSafe()`, in declaration order. */
export declare function traceSafeKeys(fields: Record<string, FieldDescriptor>): readonly string[];
/**
 * Project a row down to its trace-safe fields.
 *
 * Keys not declared `.traceSafe()` are dropped. Keys that are trace-safe but
 * absent from `row` are skipped rather than emitted as `undefined`, so a
 * partial row projects to a partial result with no holes.
 */
export declare function projectTraceSafe(fields: Record<string, FieldDescriptor>, row: Record<string, unknown>): Record<string, unknown>;
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