import type { NumberArray } from "../types/NumberArray";
export declare function getUniqueValues(array: string[]): string[];
export declare function countUnique(iterable: string[]): number;
export declare const areArraysEqual: (leftArray: number[], rightArray: number[]) => boolean;
export declare function arrayRemove<T>(array: T[], item: T): T[];
/**
 * returns true if the array is sorted
 * @param arr The array
 * @param ascending If True checks for sorted ascending, if False for descending
 */
export declare function isArraySorted(arr: NumberArray, ascending?: boolean): boolean;
/**
 * Helper method for generating an array of a given length, where the values are the indicies
 * An optional multiplier and map function can be applied.
 * @param length
 * @param multiplier
 * @param map
 * @returns
 */
export declare function makeIncArray(length: number, multiplier?: number, map?: (n: number, index?: number) => number): number[];
/**
 * Helper function to append an array to a target array, treating the target as a circular buffer
 *
 * BUG: TWO BRANCHES OF THIS FUNCTION ARE BROKEN, AND BOTH ARE REACHABLE ON A RELEASED PATH.
 * Recorded rather than fixed - see the two `BUG` markers in the body below. Fixing them changes
 * behaviour on a code path shared by every fifo series, so it needs its own task and its own test
 * matrix over both branches; do not fix one in passing.
 *
 * Reach: the live caller is `BaseDataSeries.appendMetadataRange` (BaseDataSeries.ts:1603), so this
 * backs POINT METADATA on every fifo series that carries it - metadata silently absent after an
 * over-capacity bulk append, and metadata paired with the wrong point in the other branch. It is
 * also public API (`src/index.ts:1559`), so a consumer can call it directly.
 * `XyTextDataSeries` used to be the other caller and no longer is; nothing else in `src/` calls it.
 *
 * `tests/utils/array.test.ts` holds two `it.skip` cases carrying the CORRECT expectations for both
 * faults. Un-skip them when this is fixed and they should pass as written.
 *
 * @param source
 * @param target
 * @param fifoCapacity
 * @param startIndex
 */
export declare function appendRangeFifo(source: any[], target: any[], fifoCapacity: number, startIndex: number): void;