GitHub Copilot supports 30+ programming languages, but quality varies by language based on training data volume.

Strongest Support

• Python, JavaScript, TypeScript — excellent
• Go, Ruby, C#, C++, Java — very good
• PHP, Kotlin, Swift, Rust — good

Also Supports

• HTML, CSS, SQL, Bash, PowerShell
• YAML, JSON, Markdown, Terraform
• R, MATLAB, Scala, Haskell

Tip

Copilot works best in languages with large open-source training corpora — Python and JavaScript lead by a wide margin.

Reference:

Copilot language support

https://docs.github.com/en/copilot/using-github-copilot/getting-code-suggestions-in-your-ide-with-github-copilot