/**
 * GEF Chart Helpers
 *
 * Optional utilities for detecting chart axes and formatting column metadata for visualization.
 * This is presentation logic separate from the core parser - consumers can use their own
 * chart detection logic or copy this file to their application.
 */
import { type ColumnInfo, type ZID } from "./gef-schemas";
import type { Row } from "./depth-correction";
export declare const DEPTH_KEYWORDS: string[];
export declare const CPT_QUANTITY: {
    readonly LENGTH: 1;
    readonly CONE_RESISTANCE: 2;
    readonly FRICTION_RESISTANCE: 3;
    readonly FRICTION_NUMBER: 4;
    readonly PORE_PRESSURE_U2: 6;
    readonly INCLINATION: 8;
    readonly CORRECTED_DEPTH: 11;
    readonly CORRECTED_CONE_RESISTANCE: 13;
};
/**
 * Find column by quantity number
 */
export declare function findColumnByQuantity(columns: Array<ColumnInfo>, quantityNumber: number): ColumnInfo | undefined;
/**
 * Extract unit code from verbose unit strings like "MPa (megaPascal)" -> "MPa"
 */
export declare function getUnitCode(unit: string): string;
/**
 * Get standardized display name for a column based on its quantity number
 */
export declare function getColumnDisplayName(col: ColumnInfo): string;
export interface ChartColumn {
    key: string;
    unit: string;
    name: string;
}
export interface ChartAxes {
    yAxis: ChartColumn | null;
    xAxis: ChartColumn | null;
    availableColumns: Array<ChartColumn>;
    yAxisOptions: Array<ChartColumn>;
}
/**
 * Detect sensible default chart axes for CPT data visualization
 *
 * This is opinionated presentation logic - consumers may prefer to implement
 * their own axis selection based on their specific use case.
 *
 * Default behavior:
 * - Y-axis: Penetration length (quantity 1), fallback to corrected depth (11)
 * - X-axis: Cone resistance (quantity 2), fallback to corrected cone (13) or friction (4)
 * - Also provides all available columns and Y-axis alternatives
 */
export declare function detectChartAxes(columnInfo: Array<ColumnInfo>, data: Array<Row>, zid: ZID | undefined): ChartAxes;
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