/**
 * A set of keys.
 * We use the TypeScript indexable type for this.
 * See https://www.typescriptlang.org/docs/handbook/interfaces.html
 *
 * Example:
 * {
 *     'Mon': true,
 *     'Wed': true,
 *     'Fri': true,
 *     'Sat': false,
 *     'Sun': false,
 * }
 */
export interface KeySet {
    [item: string]: boolean;
}
/**
 * A key-value pair, with the value being a boolean
 *
 * Example:
 * {
 *     key: 'Mon',
 *     value: true,
 * }
 */
export interface KeyBoolValue {
    key: string;
    value: boolean;
}
/**
 * Returns all keys of a KeySet as an array
 */
export declare const keySetToArray: (set: KeySet) => string[];
/**
 * Returns KeySet as an array of key-value pairs
 */
export declare const keySetToKeyValue: (set: KeySet) => Array<KeyBoolValue>;
/**
 * Comparison function for key-value pairs
 */
export declare function compareKeyBoolValues(e1: KeyBoolValue, e2: KeyBoolValue): number;
/**
 * Returns keys whose value is true
 */
export declare const keySetGetOnKeys: (set: KeySet) => string[];
/**
 * Returns keys whose value is true
 */
export declare const keySetGetOffKeys: (set: KeySet) => string[];
export declare const arrayToKeySet: (keys: Array<string>) => KeySet;
export declare const mergeKeySets: (...sets: Array<KeySet | undefined>) => any;
/**
 * Returns true if the two keySets have the same keys (ignoring order)
 * Note that the values are not compared.
 */
export declare const keySetsMatchKeys: (k1: KeySet, k2: KeySet) => boolean;
/**
 * Returns true if the two keySets have the same keys and values (ignoring order)
 * Note that the values are not compared.
 */
export declare const keySetsAreEqual: (k1: KeySet, k2: KeySet) => boolean;
/**
 * Returns true if the supplied KeySet contains any of the specified keys
 */
export declare const keySetContainsOneOf: (set: KeySet, keys: Array<string>) => boolean;
/**
 * Returns a new KeySet with values from src copied to target.
 * If a key does not exist in target, then it is not copied.
 * (This is different from Object.assign)
 * Neither src or target are mutated
 */
export declare const keySetCopyValues: (target: KeySet, src: KeySet) => KeySet;