@mui/material/styles/createColorScheme.js

import createPalette from "./createPalette.js";
import getOverlayAlpha from "./getOverlayAlpha.js";
const defaultDarkOverlays = [...Array(25)].map((_, index) => {
  if (index === 0) {
    return 'none';
  }
  const overlay = getOverlayAlpha(index);
  return `linear-gradient(rgba(255 255 255 / ${overlay}), rgba(255 255 255 / ${overlay}))`;
});
export function getOpacity(mode) {
  return {
    inputPlaceholder: mode === 'dark' ? 0.5 : 0.42,
    inputUnderline: mode === 'dark' ? 0.7 : 0.42,
    switchTrackDisabled: mode === 'dark' ? 0.2 : 0.12,
    switchTrack: mode === 'dark' ? 0.3 : 0.38
  };
}
export function getOverlays(mode) {
  return mode === 'dark' ? defaultDarkOverlays : [];
}
export default function createColorScheme(options) {
  const {
    palette: paletteInput = {
      mode: 'light'
    },
    // need to cast to avoid module augmentation test
    opacity,
    overlays,
    ...rest
  } = options;
  const palette = createPalette(paletteInput);
  return {
    palette,
    opacity: {
      ...getOpacity(palette.mode),
      ...opacity
    },
    overlays: overlays || getOverlays(palette.mode),
    ...rest
  };
}