import { type ImmutableDictionary } from "../../util/dictionary.js";
/**
 * Set of classnames that can be joined.
 *
 * - `string` — used directly as a classname.
 * - `null` or `undefined` — ignored.
 * - Array of classnames — recursively parsed.
 */
export type Classes = string | null | undefined | readonly Classes[] | Variants;
/**
 * Variants list is a dictionary of booleans.
 * - `true` or `false` item values in dictionaries use the string `key` of the item if the value is `true`, or ignore it if the value is falsy.
 * - Anything that is not `true` has no effect, so other values can be passed in and will be ignored. This means you can pass the entire `props` into this and it'll work just fine.
 *
 * Typed as `object` (not `Data`/`Record<string, unknown>`) so plain `interface` types are accepted —
 * interfaces lack an implicit string index signature, so they don't satisfy index-signature types.
 */
export interface Variants {
    readonly [key: string]: boolean;
}
/** CSS modules mapping of local class names to hashed runtime class names. */
export type CSSModule = ImmutableDictionary<string | undefined>;
/**
 * Parse a list of possible `className` strings and join them into a single string.
 * - See `Classes` type for parsing rules.
 *
 * @param classes The input set of classes to merge.
 * @returns The merged string classname.
 */
export declare function getClass(...classes: unknown[]): string;
/**
 * Parse a list of possible `className` strings, match them in a `CSSModule` dictionary, and join them into a single string.
 * - See `Classes` type for parsing rules.
 *
 * @param module CSS module object _or_ a string.
 * - Allows "string" because if this environment does not process `*.module.css` files then `import styles from "./styles.module.css"` will be a string.
 * - This allows this situation to be handled gracefully and classes will be silently ignored in this environment.
 *
 * @param classes Class keys/values to merge.
 * @returns The merged string classname.
 */
export declare function getModuleClass(module: CSSModule | string, ...classes: unknown[]): string | undefined;