import { ColorName } from "./colors";
export declare const documentStyle: CSSStyleDeclaration;
export declare const normalizeColor: (color: string) => string;
export declare const getStyle: (className: string) => string;
export declare const normalizeFontNames: (fonts: string | null) => string;
export declare const transparentize: (color: string, amount: number) => string;
export declare const capitalizeString: (str: string) => string;
export declare const isFunction: (f: unknown) => f is (...args: never[]) => never;
export declare const copyToClipboard: (text: string) => Promise<void>;
export declare const EMPTY_IMMUTABLE_ARRAY: readonly [];
/**
 * Helper function returning an empty immutable array.
 * This can for example be used as a default value for array props when so desired.
 * Note: Errors will be thrown at runtime when code tries to modify the returned array.
 * @returns An empty immutable array
 */
export declare const getEmptyImmutableArray: <T = ReadonlyArray<unknown>>() => NonNullable<T>;
export declare const EMPTY_IMMUTABLE_OBJECT: Readonly<{}>;
/**
 * Helper function returning an empty immutable object.
 * This can for example be used as a default value for object props when so desired.
 * Note: Errors will be thrown at runtime when code tries to modify the returned object.
 * @returns An empty immutable array
 */
export declare const getEmptyImmutableObject: <T = Readonly<unknown>>() => NonNullable<T>;
export type Nullable<T> = T | null;
export type Optional<T> = T | undefined;
export interface LabelValuePair<T> {
    value: T;
    label: string;
}
export interface KeyValuePair<T, K> {
    key: T;
    value: K;
}
export declare const isValidColorName: (color?: string) => color is ColorName;
export declare const isLTR: boolean;
export declare const isRTL: boolean;
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