declare module '@styled-system/core' {
  import * as CSS from 'csstype';

  export type ObjectOrArray<T, K extends keyof any = keyof any> = T[] | Record<K, T | Record<K, T> | T[]>;

  export type Scale = ObjectOrArray<number | string>;
  export interface styleFn {
    (...args: any[]): any;

    config?: object;
    propNames?: string[];
    cache?: object;
  }

  export interface ConfigStyle {
    /** The CSS property to use in the returned style object (overridden by `properties` if present). */
    property?: keyof CSS.Properties;
    /**
     * An array of multiple properties (e.g. `['marginLeft', 'marginRight']`) to which this style's value will be
     * assigned (overrides `property` when present).
     */
    properties?: Array<keyof CSS.Properties>;
    /** A string referencing a key in the `theme` object. */
    scale?: string;
    /** A fallback scale object for when there isn't one defined in the `theme` object. */
    defaultScale?: Scale;
    /** A function to transform the raw value based on the scale. */
    transform?: (value: any, scale?: Scale) => any;
  }

  export interface Config {
    /** Property name exposed for use in components */
    [customStyleName: string]: ConfigStyle | boolean;
  }

  export function system(styleDefinitions: Config): styleFn;
  export function get(obj: any, ...paths: Array<string | number>): any;
}