Unexpected token ':'

I am currently trying to use the terminal to see my output of “Hello, World”. When I do what the instructions ask I get no result when I use “node hello_world.js”, but when I run “node hello_world.ts” it tells me that there is an (unexpected token ‘:’). I downloaded the typescript and it shows me the the correct result when I type in tsc -v. Is there something else I need to do to? Have not been able to get the terminal to print “Hello, World”.

you added an extra space between message and : so that may be throwing the error. Mine was
let message: string = 'Hello, World';