import { Breakpoints } from './createBreakpoints'; import { Spacing } from './spacing'; import { StyleRules } from '../styles'; export interface Mixins { gutters: (styles: React.CSSProperties) => React.CSSProperties; toolbar: React.CSSProperties; // ... use interface declaration merging to add custom mixins } export interface MixinsOptions extends Partial { // ... use interface declaration merging to add custom mixin options } export default function createMixins( breakpoints: Breakpoints, spacing: Spacing, mixins: MixinsOptions, ): Mixins;