Display Repo Size for GitHub (OpenScript Userscript)

A lightweight OpenScript userscript that displays the total repository size (including all commit history, branches, tags, and packfiles) directly in the About section on GitHub repository pages (for both public and private repositories).

Features

• Accurate Git History Size: Uses GitHub's native repo.size disk usage measurement, accurately reflecting the full Git history, delta compression, and packfiles rather than loose blobs.
• New Repo Handling: If a repository was just pushed and GitHub is still computing initial disk usage (0 KB), it provides a friendly indicator (0 KB (calculating...)) until GitHub finishes indexing.
• Integrated in About Section: Injects cleanly under repository details in the right sidebar.
• Private Repositories Supported: Uses GH_PAT from OpenScript secrets for private repositories and increased rate limits.
• Turbo / SPA Compatible: Seamlessly persists across GitHub's Turbo and client-side page transitions.

Installation in OpenScript

1. Open the OpenScript extension popup.
2. Click + New in the header (or click your existing script to edit).
3. Paste the contents of DisplayRepoSizeGitHub.user.js.
4. Click save script.

GitHub PAT Configuration (for Private Repos)

1. Generate a GitHub Personal Access Token (repo scope for private repos) at github.com/settings/tokens.
2. Open OpenScript and switch to the Secrets tab.
3. Add a secret:
   • Key: GH_PAT
   • Value: <your_token>
4. Click + Add. OpenScript synchronizes the secret via chrome.storage.sync and securely provides it to your script as OpenScript.env.GH_PAT.