/** Keys to exclude from variant configurations. Currently includes `'defaultVariants'` and `''`. */
type ExcludeKeys = 'defaultVariants' | '';
/** Utility type to exclude `undefined` from a given type `T`. */
type Undefined<T> = T extends undefined ? never : T;
/**
 * Extracts the properties of the first argument of a given function type `T`, excluding `ExcludeKeys`.
 * @example
 * @see {@link https://ilkhoeri.github.io/xuxi/cvx#cvxvariants Docs}
 */
export type cvxVariants<T extends (...keys: any) => any> = Omit<Undefined<Parameters<T>[0]>, ExcludeKeys>;
/** Describes a structure for variant configurations, where each key maps to a set of possible string values. */
export type cvxKeys = {
    [key: string]: {
        [key: string]: string;
    };
};
/** Casts string keys to primitive values if they match known literals. */
export type cvxPrimitiveCast<T extends string> = T extends 'true' ? true : T extends 'false' ? false : T extends 'null' ? null : T extends 'undefined' ? undefined : T extends 'Infinity' ? typeof Infinity : T extends 'NaN' ? typeof NaN : T extends `${infer N extends number}` ? N : T;
/** Variant result type that infers primitive equivalents from string keys. */
export type cvxResult<T extends cvxKeys> = {
    [K in keyof T]?: cvxPrimitiveCast<keyof T[K] & string>;
};
/**
 * Configuration object for defining variants and their options.
 * @property `string` `[assign]` - An optional base class name to prepend to the generated string.
 * @property `T` variants - Defines the variant keys and their possible values.
 * @property `cvxResult<T>` `[defaultVariants]` - Optional default variant mappings.
 */
export interface cvxRecord<T extends cvxKeys> {
    assign?: string;
    variants: T;
    defaultVariants?: cvxResult<T>;
}
/**
 * A utility function for managing values based on variant configurations.
 *
 * @template T - The type of variant keys and their possible values.
 * @param {cvxRecord<T>} keys - The configuration object containing:
 *   - `assign` (optional): A base value to always include.
 *   - `variants`: An object defining variant keys and their possible values as classes.
 *   - `defaultVariants` (optional): Default variant values for each variant key.
 * @returns {(variants?: cvxResult<T>) => string} - A function that takes a `variants` object to override default variants
 * and generates a class name string.
 * @example
 * @see {@link https://ilkhoeri.github.io/xuxi/cvx Docs}
 */
declare function cvx<T extends cvxKeys>(keys: cvxRecord<T>): (variants?: cvxResult<T>) => string;
export { cvx };