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In the next video we are going
to do an exercise and in this
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exercise we won't really need
to execute our code in a
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browser okay because we're not
going to create a UI or
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anything we just want to be
able to run some typescript
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okay and see directly the
result in your terminal but for
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now when you run the command
TSC on your file like this with
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the watch you're basically just
saying I want to compile my
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file but I'm not executing it
okay that's what the browser is
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doing when we were using Chrome
Chrome was reading your
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JavaScript file, the JavaScript
file that has been generated
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right but here well we're not
saying to our terminal, our
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laptop, to read the JavaScript
file and execute it okay and
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and and produce the results so
that's basically what you could
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do by running a node on your
machine so for example here my
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index.ts has already been
compiled okay so you have an
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index.js and by the way for
now I just have this in my
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index.ts okay so Here is the js
file that has been generated
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which is fine and if I just run
node then target my index file
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it's going to work okay so we
want basically something that
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is going to watch our TSC file
and anytime it's going to
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change we want the node command
to run alright so to do that
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we're going to need two
libraries that are two famous
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libraries actually so you can
install them by typing NPM I and
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you're going to install TS node
so TS node will be in charge of
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compiling typescript file like
TSC but as soon as it's going
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to be compiled it's going to
run node on the javascript file has
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been produced and we're going
to need something that will
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watch any change in the project
to rerun the TS note command
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and so the library that we need
is Nodemon and you can install
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that globally like this once
it's done you can go back in
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your package to json and so
now we don't need to watch
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anymore and we don't need TSC
we can just write Nodemon like
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this on this file so Nodemon is
going to run behind the scene
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TS node on this file anytime
this file changes and now I can just
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run NPM start and as you can
see nodemon is starting it's going
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to run TS node on this file
it's going to compile it and
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then run node on the javascript
file has been produced and I
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will see my result and the cool
thing is that now if I go here
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and add something:  "hello" , I'm
going to save it going to
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recompile you're going to see
the output directly in your
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terminal okay so that's useful
when you are not working on web
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application for example alright
So for now in the next exercise
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we're going to work like this
because we don't need a UI,
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okay? So see you on the next
one.