How to use the react-native-paper.DefaultTheme.colors function in react-native-paper

// Setup global dark theme
      global.DARK = {
        colors: {
          ...DarkTheme.colors,
          surface: 'black',
          text: GREY[50],
          primary: tint[500],
          accent: tint[300],
        }
      };

      // Setup global light theme
      global.LIGHT = {
        colors: {
          ...DefaultTheme.colors,
          surface: 'white',
          text: GREY[900],
          primary: tint[500],
          accent: tint[300],
        }
      };

      props.theme.roundness = 32;
      props.theme.dark = DARKMODE;
      props.theme.colors = DARKMODE ? DARK.colors : LIGHT.colors;
      console.log(props.theme);

      let first = getFirstLaunch();
      if (!first) {
        // Update data here if it is not first launch
        let dn = new Downloader(getCurrServer());

import { View, FlatList, StyleSheet, Image } from 'react-native';
import { CometChat } from '@cometchat-pro/react-native-chat';
import { users} from './fake_data'
import { TouchableRipple, Text, BottomNavigation } from 'react-native-paper';
import NavigationService from './NavigationService';
import { DefaultTheme, Provider as PaperProvider } from 'react-native-paper';
import FontAwesome from 'react-native-vector-icons/FontAwesome';
import { Menu,MenuOptions,MenuOption,MenuTrigger } from 'react-native-popup-menu';

import ActionSheet from 'react-native-actionsheet';

const theme = {
    ...DefaultTheme,
    roundness: 2,
    colors: {
        ...DefaultTheme.colors,
        primary: '#FFF',
    }
};

export class HomeScreen extends Component {
    static navigationOptions = {
        header: null,
    }

    constructor(props) {
        console.log("IN HOME SCREEN.");
        super(props);
        this.state = {
            dataItem: '?',
            index: 0,
            routes: [

import { DefaultTheme } from "react-native-paper";
import colors from "../Colors";

const theme = {
  ...DefaultTheme,
  dark: false,
  roundness: 7,
  colors: {
    ...DefaultTheme.colors,
    primary: colors.pineapple,
    accent: colors.musturd,
    background: colors.issabeline,
    text: colors.panegrey,
    placeholder: colors.ashgrey,
    header: colors.deepkamaru,
    headerTitle: colors.white,

    //react-native-paper theme colors
    surface: colors.white,
    primaryText: colors.darkgunmetal
  }
};

export default theme;

medium: {
      fontFamily: 'Roboto-Bold',
      fontWeight: 'normal',
    },

    thin: {
      fontFamily: 'Roboto-Thin',
      fontWeight: 'normal',
    },
  },
};

const theme = {
  ...DefaultTheme,
  colors: {
    ...DefaultTheme.colors,
    primary: COLORS.primary,
    accent: COLORS.accent,
  },
  fonts: configureFonts(fontConfig),
};

import {AppContainer} from 'src/navigation';

export default class Entrypoint extends React.Component {
  render() {
    return (
      
        
      
    );
  }

...DarkTheme.colors,
    background: '#2e3436',
    primary: '#555753',
    accent: '#e9b96e',
    accent_alt: '#547f2f',
    text: '#d3d7cf',
    comment: '#272c2d',
  }
};


const whiteTheme = {
  ...DefaultTheme,
  roundness: 2,
  colors: {
    ...DefaultTheme.colors,
    background: '#ffffff',
    primary: '#30579a',
    accent: '#30579a',
    accent_alt: '#547f2f',
    text: '#070707',
    comment: '#ececec',
  }
};


class LOReader extends Component {

  state = {
    theme: darkTheme
  };

import React, { Component } from 'react';
import { Provider } from 'react-redux';
import { PersistGate } from 'redux-persist/es/integration/react';
import NavigationStack from 'src/navigation';
import configureStore from 'src/store/configureStore';
const { persistor, store } = configureStore();
import { DefaultTheme, Provider as PaperProvider } from 'react-native-paper';

const theme = {
    ...DefaultTheme,
    roundness: 2,
    colors: {
        ...DefaultTheme.colors,
        primary: '#0084ff',
        accent: '#f1c40f',
        background: '#f9f9f9',
        paper: 'white'
    }
};

export default class Entrypoint extends Component {
    render() {
        return (

import { DefaultTheme } from 'react-native-paper';

export default {
  ...DefaultTheme,
  roundness: 5,
  colors: {
    ...DefaultTheme.colors,
    primary: '#4A90E2',
    accent: '#1C4442',
  },
  fonts: {
    thin: 'product-regular',
    light: 'product-regular',
    regular: 'product-regular',
    medium: 'product-medium',
    bold: 'product-bold',
    italic: 'product-italic',
  },
};

import {DefaultTheme} from 'react-native-paper';
import colors from '../Colors';

const theme = {
  ...DefaultTheme,
  dark: false,
  roundness: 7,
  colors: {
    ...DefaultTheme.colors,
    primary: colors.tiffanyBlue,
    accent: colors.flame,
    background: colors.issabeline,
    text: colors.panegrey,
    placeholder: colors.ashgrey,
    header: colors.deepkamaru,
    headerTitle: colors.white,

    //react-native-paper theme colors
    surface: colors.white,
    primaryText: colors.darkgunmetal,
  },
};

export default theme;

render() {
    return (
      
    );
  }
}