Anjana Vakil is a US software engineer (formerly at Mozilla and Observable) and one of the longer-running Frontend Masters instructors. She is widely cited for the clarity of her teaching on functional programming concepts in JavaScript and on TypeScript fundamentals for working developers.
Her CourseFlix listing carries TypeScript — From First Steps to Professional — a structured TypeScript curriculum that takes a JavaScript developer from no TypeScript experience through to the patterns that show up in real production TypeScript codebases.
Material is paid; Anjana's courses are primarily distributed through Frontend Masters on the original platform. Courses are aimed at JavaScript developers picking up TypeScript seriously. For broader content, see CourseFlix's TypeScript category page.