message: packages/theme: fix theme palette types
diff: */
  import { Theme, ThemeOptions } from '@material-ui/core';
  +import {
  + PaletteOptions,
  + Palette,
  +} from '@material-ui/core/styles/createPalette';
  export type BackstageColorScheme = {
  TEXT_COLOR: string;
  @@ -33,7 +37,7 @@ export type BackstageColorScheme = {
  STATUS_ERROR: string;
  };
  -export type BackstagePalette = Theme['palette'] & {
  +type PaletteAdditions = {
  status: {
  ok: string;
  warning: string;
  @@ -65,10 +69,13 @@ export type BackstagePalette = Theme['palette'] & {
  };
  };
  +export type BackstagePalette = Palette & PaletteAdditions;
  +export type BackstagePaletteOptions = PaletteOptions & PaletteAdditions;
  +
  export interface BackstageTheme extends Theme {
  palette: BackstagePalette;
  }
  export interface BackstageThemeOptions extends ThemeOptions {
  - palette: Partial<BackstagePalette>;
  + palette: BackstagePaletteOptions;
  }
  