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Now to get started I want to make sure that I don't have to rerun this command here.

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This TSC command we're at point at a file after every change I make because right now whenever I change

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something here in my typescript file and a one hour reflect that in my output file and on this Web page

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here we have to save to file run the compilation again and then reload this file or if we have our NPM

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start process running which we should have that at least our browser will automatically reload if we

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don't directly open the file but instead are on low closed three thousand.

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But nonetheless even though with that reloading automatically we still have to manually rerun the compilation

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command.

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So to get rid of that we can enter watch mode.

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That means we can tell typescript to watch file and whenever that file changes typescript will recompile.

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So for that we can still run the same command but now we add dash dash watch at the end or just single

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dash w if we do that then we are in watch mode on that file.

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And now whenever we change anything in there and we save that so that the file on the disk technically

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changes as well.

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You see does automate automated you read compiles.

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And of course this also means that if we would do anything which is not allowed.

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Like for example reassigning to a constant and then a wrong type as well.

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Whenever we tried to do that of course it all recompensed.

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But then just as if we manually run the command we see the compilation error down there.

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So watch mode is already a big improvement.

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The downside is that we still have to specifically target this file here and at the moment of course

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this is the only file we're working with.

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But typically in bigger projects that's not necessarily the case.