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Section 1.4: Running TypeScript using ts-node

ts-node is an npm package which allows the user to run typescript files directly, without the need for precompilation using tsc . It also provides REPL.

Install ts-node globally using

  • npm install -g ts-node

ts-node does not bundle typescript compiler, so you might need to install it.

  • npm install -g typescript

Executing script

To execute a script named main.ts, run

  • ts-node main.ts

main.ts (example file)

console.log("Hello world");

Example usage

  • $ ts-node main.ts Hello world

Running REPL

To run REPL run command ts-node

  • Example usage
$ `ts-node`
> const sum = (a, b): number => a + b;
> `undefined`
> `sum(2, 2)`
> 4
> .exit

To exit REPL use command .exit or press CTRL+C twice.