dsanders11/index.html

## index.html
<!DOCTYPE html>
<html>
  <head>
    <title>Starship</title>
  </head>
  <body>
    <h1>Starship</h1>
    <p id="current-theme"></p>
    <nav>
      <button id="theme-dark">Set Dark Theme</button>
      <button id="theme-light">Set Light Theme</button>
      <button id="theme-auto">Set Auto Theme</button>
    </nav>

    <script src="./renderer.js"></script>
  </body>
</html>

## main.js
const {app} = require('electron')

const { Window } = require('./starship')

function createWindow () {
  // Create the Starship window.
  const mainWindow = new Window({
    width: 800,
    height: 600,
  })

  // and load the index.html of the app.
  mainWindow.loadFile('index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
}

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.whenReady().then(() => {
  createWindow()

  app.on('activate', function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
})

// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

## package.json
{
  "name": "milky-power-groan-dvhp2",
  "productName": "milky-power-groan-dvhp2",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "dsanders11",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "18.3.15"
  }
}

## preload.js
const { contextBridge, ipcRenderer } = require('electron')

async function getTheme() {
  return ipcRenderer.invoke('starship.theme.get')
}

async function setTheme(theme) {
  ipcRenderer.send('starship.theme.set', theme)
}

contextBridge.exposeInMainWorld(
  'starship',
  {
    theme: {
      get: getTheme,
      set: setTheme,
    }
  }
)

window.onload = () => {
  const matcher = window.matchMedia('(prefers-color-scheme: dark)');
  document.documentElement.setAttribute('data-theme', matcher.matches ? 'dark' : 'light')
  matcher.addEventListener('change', (event) => {
    document.documentElement.setAttribute('data-theme', event.matches ? 'dark' : 'light')
  })
};

const css = `
  [data-theme='dark'] {
    color-scheme: only dark;
  }

  [data-theme='light'] {
    color-scheme: only light;
  }
`

window.addEventListener('DOMContentLoaded', () => {
  const style = document.createElement('style')
  document.head.appendChild(style)

  style.type = 'text/css'
  style.appendChild(document.createTextNode(css))
})

## renderer.js
function getTheme() {
  starship.theme.get().then((currentTheme) => {
    document.getElementById("current-theme").innerHTML = currentTheme;
  }).catch((error) => {
    throw error;
  });
}

document.getElementById("theme-dark").onclick = function () {
  return starship.theme.set('dark').then(getTheme);
};

document.getElementById("theme-light").onclick = function () {
  return starship.theme.set('light').then(getTheme);
};

document.getElementById("theme-auto").onclick = function () {
  return starship.theme.set('auto').then(getTheme);
};

getTheme();

## starship.js
const {ipcMain, nativeTheme, BrowserWindow} = require('electron')
const path = require('path')

let theme = nativeTheme.themeSource;

ipcMain.handle('starship.theme.get', async () => {
  if (theme === 'system') return 'auto'
  return theme
})

ipcMain.on('starship.theme.set', async (event, newTheme) => {
  if (newTheme === 'auto') {
      nativeTheme.themeSource = 'system'
  } else {
      nativeTheme.themeSource = newTheme
  }

  theme = newTheme
})

class Window {
    constructor(options) {
        return new BrowserWindow({
            ...options,
            webPreferences: {
                ...options.webPreferences,
                preload: path.join(__dirname, 'preload.js')
            }
        })
    }
}

module.exports = {
  Window
}
	<!DOCTYPE html>
	<html>
	<head>
	<title>Starship</title>
	</head>
	<body>
	<h1>Starship</h1>
	<p id="current-theme"></p>
	<nav>
	<button id="theme-dark">Set Dark Theme</button>
	<button id="theme-light">Set Light Theme</button>
	<button id="theme-auto">Set Auto Theme</button>
	</nav>

	<script src="./renderer.js"></script>
	</body>
	</html>
	const {app} = require('electron')

	const { Window } = require('./starship')

	function createWindow () {
	// Create the Starship window.
	const mainWindow = new Window({
	width: 800,
	height: 600,
	})

	// and load the index.html of the app.
	mainWindow.loadFile('index.html')

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()
	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.whenReady().then(() => {
	createWindow()

	app.on('activate', function () {
	// On macOS it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (BrowserWindow.getAllWindows().length === 0) createWindow()
	})
	})

	// Quit when all windows are closed, except on macOS. There, it's common
	// for applications and their menu bar to stay active until the user quits
	// explicitly with Cmd + Q.
	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})
	{
	"name": "milky-power-groan-dvhp2",
	"productName": "milky-power-groan-dvhp2",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "dsanders11",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "18.3.15"
	}
	}
	const { contextBridge, ipcRenderer } = require('electron')

	async function getTheme() {
	return ipcRenderer.invoke('starship.theme.get')
	}

	async function setTheme(theme) {
	ipcRenderer.send('starship.theme.set', theme)
	}

	contextBridge.exposeInMainWorld(
	'starship',
	{
	theme: {
	get: getTheme,
	set: setTheme,
	}
	}
	)

	window.onload = () => {
	const matcher = window.matchMedia('(prefers-color-scheme: dark)');
	document.documentElement.setAttribute('data-theme', matcher.matches ? 'dark' : 'light')
	matcher.addEventListener('change', (event) => {
	document.documentElement.setAttribute('data-theme', event.matches ? 'dark' : 'light')
	})
	};

	const css = `
	[data-theme='dark'] {
	color-scheme: only dark;
	}

	[data-theme='light'] {
	color-scheme: only light;
	}
	`

	window.addEventListener('DOMContentLoaded', () => {
	const style = document.createElement('style')
	document.head.appendChild(style)

	style.type = 'text/css'
	style.appendChild(document.createTextNode(css))
	})
	function getTheme() {
	starship.theme.get().then((currentTheme) => {
	document.getElementById("current-theme").innerHTML = currentTheme;
	}).catch((error) => {
	throw error;
	});
	}

	document.getElementById("theme-dark").onclick = function () {
	return starship.theme.set('dark').then(getTheme);
	};

	document.getElementById("theme-light").onclick = function () {
	return starship.theme.set('light').then(getTheme);
	};

	document.getElementById("theme-auto").onclick = function () {
	return starship.theme.set('auto').then(getTheme);
	};

	getTheme();
	const {ipcMain, nativeTheme, BrowserWindow} = require('electron')
	const path = require('path')

	let theme = nativeTheme.themeSource;

	ipcMain.handle('starship.theme.get', async () => {
	if (theme === 'system') return 'auto'
	return theme
	})

	ipcMain.on('starship.theme.set', async (event, newTheme) => {
	if (newTheme === 'auto') {
	nativeTheme.themeSource = 'system'
	} else {
	nativeTheme.themeSource = newTheme
	}

	theme = newTheme
	})

	class Window {
	constructor(options) {
	return new BrowserWindow({
	...options,
	webPreferences: {
	...options.webPreferences,
	preload: path.join(__dirname, 'preload.js')
	}
	})
	}
	}

	module.exports = {
	Window
	}