cdslogviewer/frontend/app/theming.ts

import { createMuiTheme, ThemeOptions } from "@material-ui/core/styles";
import {
  Palette,
  PaletteOptions,
} from "@material-ui/core/styles/createPalette";

declare module "@material-ui/core/styles/createPalette" {
  interface Palette {
    logviewer: { main: string; background: string };
  }

  interface PaletteOptions {
    logviewer?: { main?: string; background?: string };
  }
}

export default function createCustomisedTheme(options: ThemeOptions) {
  return createMuiTheme({
    palette: {
      logviewer: {
        main: "green",
        background: "black",
      },
    },
    ...options,
  });
}