type ElementOf<T> = T extends Array<any> ? T[number] : never;
type ValueOf<T> = T[keyof T];
export type Concrete<T> = {
    [Key in keyof T]-?: T[Key];
};
/**
 * If typeof `Value` is value, returns `Node`.
 * Otherwise returns the value.
 */
export type ValueAttribute<Value, Node> = (() => Value) & ((value: Value) => Node);
/**
 * If no params, returns `Value`.
 * Otherwise returns the `Node`.
 */
export type ObjectAttribute<Value, Node> = (() => Value) & (<K extends Value extends Record<string, any> ? Value : never>(key: K | keyof K | boolean) => Node) & (<K extends Value extends Record<string, any> ? keyof Value : never, V extends Value extends Record<string, any> ? ValueOf<Value> : never>(key: K, value: V | boolean) => Node);
/**
 * If typeof `Value` is an array or an element of array, returns `Node`.
 * Otherwise returns the array.
 */
export type ArrayAttribute<Value, Node> = (() => Value) & ((value: Value | ElementOf<Value>) => Node);
/**
 * Filter Object keys with the specified prefix.
 * @example
 * type A = { 'mark.a': number, 'composition.b': number }
 * type B = FilterKey<A, 'mark'>; // { 'a': number }
 */
export type FilterKey<T extends string | symbol | number, Prefix extends string> = T extends `${Prefix}.${infer Key}` ? Key : never;
/**
 * Filter Object keys with `mark` as prefix.
 * @example
 * type A = { 'mark.a': number, 'composition.b': number }
 * type B = FilterKey<A, 'mark'>; // { 'a': number }
 * @todo Remove component.xxxx
 */
export type FilterMark<T extends string | symbol | number> = T extends 'component.axisX' ? 'axisX' : T extends 'component.axisY' ? 'axisY' : T extends 'component.legends' ? 'legends' : FilterKey<T, 'mark'>;
/**
 * Filter Object keys with `composition` as prefix.
 * @example
 * type A = { 'mark.a': number, 'composition.b': number }
 * type B = FilterComposition<A>; // { 'b': number }
 */
export type FilterComposition<T extends string | symbol | number> = FilterKey<T, 'composition'>;
/**
 * Map marks of library to Nodes.
 */
export type MarkOf<Library extends Record<string, any>, Node> = {
    [Key in keyof Library as FilterMark<Key>]: Node;
};
/**
 * Map compositions of library to Nodes.
 */
export type CompositionOf<Library extends Record<string, any>, Node> = {
    [Key in keyof Library as FilterComposition<Key>]: Node;
};
/**
 * Map descriptors to props of Nodes.
 */
export type PropsOf<Descriptor extends Record<string, any>, Spec extends Record<any, any>, Node> = {
    [Key in keyof Descriptor]: Descriptor[Key] extends {
        type: 'object';
    } ? ObjectAttribute<Spec[Key], Node> : Descriptor[Key] extends {
        type: 'value';
    } ? ValueAttribute<Spec[Key], Node> : ArrayAttribute<Spec[Key], Node>;
};
export {};