import type { ColumnDataType } from './column.types';
/**
 * Semantic groupings of {@link ColumnDataType}, in one place.
 *
 * These predicates were previously duplicated as four independent `Set`
 * literals — in `chart/chart-analyzer/types.ts`, `chart/range-chart-service.ts`,
 * `chart/range-chart-controller.ts` and
 * `photon-ai/insight/data-analysis-service.ts`. Adding a column type then meant
 * finding all four, and missing one produced a type that could be charted but
 * not analysed, or the reverse, with nothing to catch it. One export means one
 * edit.
 *
 * Typed as `ReadonlySet<ColumnDataType>` so a typo is a compile error, and read
 * through the helpers below so callers holding a `string` (the chart layer
 * mostly does) do not each write their own cast.
 *
 * @packageDocumentation
 */
/**
 * Types whose values are quantities — summable, averagable, chartable as a
 * measure, and sorted numerically.
 *
 * `duration` is here because it is stored as a number of seconds; that is what
 * makes "average handling time" a meaningful aggregate.
 */
export declare const NUMERIC_COLUMN_TYPES: ReadonlySet<ColumnDataType>;
/** Types that carry a point in time. */
export declare const DATE_COLUMN_TYPES: ReadonlySet<ColumnDataType>;
/**
 * Types suitable as a chart's category axis or an analysis dimension — values
 * you group *by* rather than aggregate.
 *
 * `phone` and `url` are excluded on purpose: both are effectively unique per
 * row, so grouping by one produces a category per record and a useless chart.
 */
export declare const DIMENSION_COLUMN_TYPES: ReadonlySet<ColumnDataType>;
/** {@link NUMERIC_COLUMN_TYPES} membership for a loosely-typed column type. */
export declare function isNumericColumnType(type: string | undefined): boolean;
/** {@link DATE_COLUMN_TYPES} membership for a loosely-typed column type. */
export declare function isDateColumnType(type: string | undefined): boolean;
/** {@link DIMENSION_COLUMN_TYPES} membership for a loosely-typed column type. */
export declare function isDimensionColumnType(type: string | undefined): boolean;
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