tsc watch

Watch and re-transpile any TypeScript file with:

tsc file.ts --watch

You can use this tool to quickly tell if you’ve written compilable TypeScript, without other tooling set up. Take any TypeScript file and compile it with the watch option:

tsc tutorial/src/index.ts --watch

This returns:

Starting compilation in watch mode.

Now, when you write your tutorial file, the compiler transpiles, giving near-instant feedback.

See tsc --help for more info.