Display Repo and File Sizes for GitHub

A lightweight OpenScript that displays total repository disk usage in the About section and each file's size beside its name in GitHub's file browser.

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.
• Individual File Sizes: Shows human-readable byte sizes beside files in root and nested directory listings.
• GitHub-Native Layout: Targets only responsive filename cells, leaving commit messages, dates, links, and directory rows untouched.
• 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.
• No Cache or Script Storage: Reads fresh repository and directory data from GitHub's API for each rendered view.

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.