Is it possible to enhance an interface by integrating the characteristics of a constant?

I am currently working on customizing a material-ui v4 Theme. Within our separate @our-project/ui package, we have the following:

export declare const themeOptions: {
  palette: {
    // some colors missing from Palette
  }
  status: string;
  // other properties
}

According to the instructions provided at https://v4.mui.com/guides/typescript/#customization-of-theme, I need to add properties to Theme (and Palette):

import { Theme } from '@material-ui/core/styles/createTheme';

declare module '@material-ui/core/styles/createTheme' {
  interface Theme {
    status: string;
  }
  // allow configuration using `createTheme`
  interface ThemeOptions {
    status?: string;
  }
}

declare module '@material-ui/core/styles/createPalette' {
  interface Palette {
    green: PaletteColor;
    // other colors
  }

  interface PaletteOptions extends DeepPartial<AdminLightPalette> {
    green?: PaletteColor;
  }
}

However, I want to avoid manually duplicating these properties and having to update them whenever there are changes in @our-project/ui. The attempt to augment with

interface Theme extends typeof themeOptions
does not compile. How can I solve this issue?

Answer №1

Trying to enhance it with

interface Theme extends typeof themeOptions
results in a compilation error.

However, assigning a name to it resolves the issue:

type OurThemeOptions = typeof themeOptions;
type OurPalette = typeof themeOptions.palette;

declare module '@material-ui/core/styles/createTheme' {
  interface Theme extends OurThemeOptions {};
  interface ThemeOptions extends DeepPartial<OurThemeOptions> {};
}

declare module '@material-ui/core/styles/createPalette' {
  interface Palette extends OurPalette {}
  interface PaletteOptions extends DeepPartial<OurPalette> {}
}

Utilizing DeepPartial from TypeScript: deep partial?.

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