import { IIterator } from './iteration';
import { ISequence } from './sequence';
/**
 * Create a range of evenly spaced values.
 *
 * @param start - The starting value for the range, inclusive.
 *
 * @param stop - The stopping value for the range, exclusive.
 *
 * @param step - The nonzero distance between each value.
 *
 * @returns A range object which produces evenly spaced values.
 *
 * #### Notes
 * In the single argument form of `range(stop)`, `start` defaults to
 * `0` and `step` defaults to `1`.
 *
 * In the two argument form of `range(start, stop)`, `step` defaults
 * to `1`.
 *
 * All values can be any real number, but `step` cannot be `0`.
 */
export declare function range(start: number, stop?: number, step?: number): Range;
/**
 * An object which produces a range of evenly spaced values.
 */
export declare class Range implements ISequence<number> {
    /**
     * Construct a new range.
     *
     * @param start - The starting value for the range, inclusive.
     *
     * @param stop - The stopping value for the range, exclusive.
     *
     * @param step - The nonzero distance between each value.
     */
    constructor(start: number, stop: number, step: number);
    /**
     * The starting value for the range, inclusive.
     *
     * #### Notes
     * This is a read-only property.
     */
    readonly start: number;
    /**
     * The stopping value for the range, exclusive.
     *
     * #### Notes
     * This is a read-only property.
     */
    readonly stop: number;
    /**
     * The distance between each value.
     *
     * #### Notes
     * This is a read-only property.
     */
    readonly step: number;
    /**
     * The number of values in the range.
     *
     * #### Notes
     * This is a read-only property.
     */
    readonly length: number;
    /**
     * Create an iterator over the range of values.
     *
     * @returns A new iterator for the range of values.
     */
    iter(): RangeIterator;
    /**
     * Get the value at the specified index.
     *
     * @param index - The positive integer index of interest.
     *
     * @returns The value at the specified index.
     *
     * #### Undefined Behavior
     * An `index` which is non-integral or out of range.
     */
    at(index: number): number;
    private _start;
    private _stop;
    private _step;
    private _length;
}
/**
 * An iterator which generates evenly spaced values.
 */
export declare class RangeIterator implements IIterator<number> {
    /**
     * Construct a new range iterator.
     *
     * @param start - The starting value for the range, inclusive.
     *
     * @param stop - The stopping value for the range, exclusive.
     *
     * @param step - The non-zero distance between each value.
     */
    constructor(start: number, stop: number, step: number);
    /**
     * Create an iterator over the object's values.
     *
     * @returns A reference to `this` iterator.
     */
    iter(): this;
    /**
     * Create an independent clone of the range iterator.
     *
     * @returns A new iterator starting with the current value.
     */
    clone(): RangeIterator;
    /**
     * Get the next value from the range.
     *
     * @returns The next value from the range, or `undefined` if the
     *   iterator is exhausted.
     */
    next(): number;
    private _start;
    private _step;
    private _index;
    private _length;
}