import { LDMLKeyboard } from "@keymanapp/developer-utils";
/**
 * Verifies that value is an item in the enumeration.
 */
export declare function isValidEnumValue<T extends {
    [key: number]: string | number;
}>(enu: T, value: string): boolean;
/**
 * Returns unique LKKeys only, preserving later ones
 * in case of conflict. (i.e. later overrides)
 * @param keys list of keys to consider. (mutated)
 * @returns Array of unique keys. Order is not specified.
 */
export declare function calculateUniqueKeys(keys?: LDMLKeyboard.LKKey[]): LDMLKeyboard.LKKey[];
/** Convert an array of keys to a hash */
export declare function hashKeys(keys?: LDMLKeyboard.LKKey[]): Map<string, LDMLKeyboard.LKKey>;
export declare function hashFlicks(flicks?: LDMLKeyboard.LKFlick[]): Map<string, LDMLKeyboard.LKFlick>;
/**
 * @param layersList list of layers elements, from `keyboard?.layers`
 * @returns set of key IDs
 */
export declare function allUsedKeyIdsInLayers(layersList?: LDMLKeyboard.LKLayers[]): Set<string>;
/**
 * Extract all of the key ids that this key refers to, not counting flicks
 * @returns map from the key id to a set of attribute names (such as `multiTapDefaultKeyId` etc.) used by that key.
 */
export declare function allUsedKeyIdsInKey(key: LDMLKeyboard.LKKey): Map<string, string[]>;
export declare function allUsedKeyIdsInFlick(flick?: LDMLKeyboard.LKFlick): Set<string>;
/**
 * Helper function for validating child elements. Written for the convenience of message passing functions.
 *
 * @param values array of values to check
 * @param onDuplicate callback with array of duplicate values, deduped
 * @param allowed optional set of valid values
 * @param onInvalid callback with array of invalid values, deduped
 * @returns true if all OK
 */
export declare function verifyValidAndUnique(values: string[], onDuplicate: (duplicates: string[]) => void, allowed?: Set<string>, onInvalid?: (invalids: string[]) => void): boolean;
/**
 * Determine modifier from layer info
 * @param layer layer obj
 * @returns modifier array
 */
export declare function translateLayerAttrToModifier(layer: LDMLKeyboard.LKLayer): number[];
/**
 * @param modifier modifier sequence such as undefined, "none", "shift altR" etc
 * @returns true if valid
 */
export declare function validModifier(modifier?: string): boolean;
//# sourceMappingURL=util.d.ts.map