react-native-paper/lib/module/styles/overlay.js

import color from 'color';
import { Animated } from 'react-native';
import DarkTheme from './DarkTheme';

const isAnimatedValue = it => it instanceof Animated.Value;

export default function overlay(elevation) {
  let surfaceColor = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : DarkTheme.colors.surface;

  if (isAnimatedValue(elevation)) {
    const inputRange = [0, 1, 2, 3, 8, 24]; // @ts-expect-error: TS doesn't seem to refine the type correctly

    return elevation.interpolate({
      inputRange,
      outputRange: inputRange.map(elevation => {
        return calculateColor(surfaceColor, elevation);
      })
    });
  } // @ts-expect-error: TS doesn't seem to refine the type correctly


  return calculateColor(surfaceColor, elevation);
}

function calculateColor(surfaceColor) {
  let elevation = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 1;
  let overlayTransparency;

  if (elevation >= 1 && elevation <= 24) {
    overlayTransparency = elevationOverlayTransparency[elevation];
  } else if (elevation > 24) {
    overlayTransparency = elevationOverlayTransparency[24];
  } else {
    overlayTransparency = elevationOverlayTransparency[1];
  }

  return color(surfaceColor).mix(color('white'), overlayTransparency * 0.01).hex();
}

const elevationOverlayTransparency = {
  1: 5,
  2: 7,
  3: 8,
  4: 9,
  5: 10,
  6: 11,
  7: 11.5,
  8: 12,
  9: 12.5,
  10: 13,
  11: 13.5,
  12: 14,
  13: 14.25,
  14: 14.5,
  15: 14.75,
  16: 15,
  17: 15.12,
  18: 15.24,
  19: 15.36,
  20: 15.48,
  21: 15.6,
  22: 15.72,
  23: 15.84,
  24: 16
};
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