Why you should use TypeScript for writing Cloud Functions
Blog post from Firebase
TypeScript support in the Firebase CLI enables developers to write Cloud Functions with optional static typing, modern language features such as classes, generics, enums, and async/await, while remaining compatible with existing JavaScript code. When initialized with TypeScript, Firebase configures development dependencies, build and lint scripts, compiler settings that transform source files from the functions/src directory into ES6 JavaScript, and predeployment hooks that prevent deployment when linting or compilation fails. TSLint is emphasized as a tool for catching common Cloud Functions issues early, especially unhandled promises in database triggers, which must be returned or awaited to ensure functions complete correctly. It also encourages readability and maintainability through rules such as preferring const over var and avoiding shadowed variable names. Developers can receive immediate TSLint feedback in editors such as Visual Studio Code, and can gradually adopt TypeScript by renaming existing JavaScript files to .ts files before introducing additional TypeScript features.
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