repomix/browser/app/scripts/background.js

// This background.js is kept minimal as all implementation is handled in content_scripts

const injectContentToTab = async (tab) => {
  // Skip if URL is undefined
  if (!tab.url) {
    return;
  }

  // Skip if tab is discarded
  if (tab.discarded) {
    return;
  }

  // Skip if tab ID is undefined
  if (tab.id === undefined) {
    return;
  }

  // Skip if not a GitHub URL
  if (!tab.url.startsWith('https://github.com/')) {
    return;
  }

  try {
    const manifest = chrome.runtime.getManifest();

    // Inject CSS
    if (manifest.content_scripts && manifest.content_scripts[0].css) {
      await chrome.scripting.insertCSS({
        target: { tabId: tab.id },
        files: manifest.content_scripts[0].css
      });
    }

    // Inject JavaScript
    if (manifest.content_scripts && manifest.content_scripts[0].js) {
      await chrome.scripting.executeScript({
        target: { tabId: tab.id },
        files: manifest.content_scripts[0].js
      });
    }
  } catch (e) {
    // Ignore errors (e.g., chrome:// pages, extension pages, etc.)
  }
};

// Apply content to all tabs when installed or updated
chrome.runtime.onInstalled.addListener(() => {
  chrome.tabs.query({}, async (tabs) => {
    for (const tab of tabs) {
      try {
        await injectContentToTab(tab);
      } catch (e) {
        console.error('Failed to inject content to tab:', e);
      }
    }
  });
});

// Apply content when a new tab is created
chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
  if (changeInfo.status === 'complete') {
    injectContentToTab(tab);
  }
});