lens/build/build_tray_icon.ts

// Generate tray icons from SVG to PNG + different sizes and colors (B&W)
// Command: `yarn build:tray-icons`
import path from "path";
import sharp from "sharp";
import jsdom from "jsdom";
import fs from "fs-extra";

export async function generateTrayIcon(
  {
    outputFilename = "tray_icon", // e.g. output tray_icon_dark@2x.png
    svgIconPath = path.resolve(__dirname, "../src/renderer/components/icon/logo-lens.svg"),
    outputFolder = path.resolve(__dirname, "./tray"),
    dpiSuffix = "2x",
    pixelSize = 32,
    shouldUseDarkColors = false, // managed by electron.nativeTheme.shouldUseDarkColors
  } = {}) {
  outputFilename += shouldUseDarkColors ? "_dark" : "";
  dpiSuffix = dpiSuffix !== "1x" ? `@${dpiSuffix}` : "";
  const pngIconDestPath = path.resolve(outputFolder, `${outputFilename}${dpiSuffix}.png`);
  try {
    // Modify .SVG colors
    const trayIconColor = shouldUseDarkColors ? "white" : "black";
    const svgDom = await jsdom.JSDOM.fromFile(svgIconPath);
    const svgRoot = svgDom.window.document.body.getElementsByTagName("svg")[0];
    svgRoot.innerHTML += `<style>* {fill: ${trayIconColor} !important;}</style>`;
    const svgIconBuffer = Buffer.from(svgRoot.outerHTML);

    // Resize and convert to .PNG
    const pngIconBuffer: Buffer = await sharp(svgIconBuffer)
      .resize({ width: pixelSize, height: pixelSize })
      .png()
      .toBuffer();

    // Save icon
    await fs.writeFile(pngIconDestPath, pngIconBuffer);
    console.info(`[DONE]: Tray icon saved at "${pngIconDestPath}"`);
  } catch (err) {
    console.error(`[ERROR]: ${err}`);
  }
}

// Run
const iconSizes: Record<string, number> = {
  "1x": 16,
  "2x": 32,
  "3x": 48,
};
Object.entries(iconSizes).forEach(([dpiSuffix, pixelSize]) => {
  generateTrayIcon({ dpiSuffix, pixelSize, shouldUseDarkColors: false });
  generateTrayIcon({ dpiSuffix, pixelSize, shouldUseDarkColors: true });
});