import { type MetricQuery } from '../types/metricQuery';
/**
 * Resolves the effective timezone for a query using the hierarchy:
 *   metricQuery.timezone → project timezone → 'UTC'
 *
 * The project timezone (from getQueryTimezoneForProject) already handles
 * the project → config → 'UTC' fallback, so this helper only adds the
 * per-chart override layer on top.
 *
 * Validates the resolved timezone to prevent SQL injection — the result
 * is interpolated into warehouse SQL strings (e.g., AT TIME ZONE '...').
 */
export declare function resolveQueryTimezone(metricQuery: Pick<MetricQuery, 'timezone'>, projectTimezone: string): string;
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