Searching code
someCodePiece in:file searches for code in any file in the repository
filename: something.ts searches for filenames in the repository
something in:path searches in file path
You can search by more criteria like size:>10000, language:LANGUAGE, extension:TS or by user:USERNAME, org:ORGNAME, repo:USERNAME/REPOSITORY
You can search almost anything, for example commits, topics, repositories, issues, PRs, discussions, users, packages, wikis, forks.
More on the Search On GitHub page.
About Author
I am Mathias from Heidelberg, Germany. I am a passionate IT freelancer with 15+ years experience in programming, especially in developing web based applications for companies that range from small startups to the big players out there. I create Bosycom and initiated several software projects.