build.js

#!/usr/bin/env node
/**
 * GeoSpot build script
 * ---------------------
 * The extension logic (popup.js, background.js, popup.html, shared images,
 * and _locales translations) is identical across Chrome and Firefox once
 * written against the promise-based `browser.*` namespace (see the small
 * shim at the top of popup.js / background.js). Only manifest.json genuinely
 * differs per browser (service_worker vs. scripts array, CSP,
 * browser_specific_settings) and is hand-maintained in chrome/manifest.json
 * and firefox/manifest.json.
 *
 * Edit files under ./shared, then run:
 *   node build.js
 * to copy them into ./chrome and ./firefox. Do not edit the copies in
 * chrome/ or firefox/ directly - they will be overwritten.
 */
const fs = require('fs');
const path = require('path');

const ROOT = __dirname;
const SHARED = path.join(ROOT, 'shared');
const TARGETS = ['chrome', 'firefox'];
const SHARED_FILES = ['popup.js', 'background.js', 'popup.html'];

function copyFile(src, dest) {
    fs.mkdirSync(path.dirname(dest), { recursive: true });
    fs.copyFileSync(src, dest);
    console.log(`  ${path.relative(ROOT, src)} -> ${path.relative(ROOT, dest)}`);
}

for (const target of TARGETS) {
    console.log(`Syncing shared/ -> ${target}/`);

    for (const file of SHARED_FILES) {
        copyFile(path.join(SHARED, file), path.join(ROOT, target, file));
    }

    const sharedImagesDir = path.join(SHARED, 'images');
    const targetImagesDir = path.join(ROOT, target, 'images');
    for (const imgFile of fs.readdirSync(sharedImagesDir)) {
        copyFile(path.join(sharedImagesDir, imgFile), path.join(targetImagesDir, imgFile));
    }

    const sharedLocalesDir = path.join(SHARED, '_locales');
    const targetLocalesDir = path.join(ROOT, target, '_locales');
    for (const locale of fs.readdirSync(sharedLocalesDir)) {
        copyFile(
            path.join(sharedLocalesDir, locale, 'messages.json'),
            path.join(targetLocalesDir, locale, 'messages.json')
        );
    }
}

console.log('\nDone. manifest.json in chrome/ and firefox/ are hand-maintained and were not touched.');