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So this is now how we can manage multiple files with typescript.

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Now one word about having multiple files when you work with multiple files as we're doing it here.

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You can also import them into each other with modules which you might know from Manila javascript.

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Here we have modules as well.

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It is something I'll cover in a dedicated section of this course though.

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So for now we just have two files which are not imported into each other but which are instead imported

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into index h to.

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Now with that out of the way though we know that we can manage this as a project and then we can compile

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multiple files here.

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Now let's have a look at the T conflict Jason File because this is a crucial file for managing this

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project.

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It essentially tells typescript how it should compile these files.

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Now before we dive into the compiler options where we as the name suggests can configure how the compiler

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behaves.

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Let's scroll down to the place before the closing curly brace but after this nested closing curly brace

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and let's see some of the options we can add here which don't affect the compiler or the compilation

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step behavior but instead how the compiler works with this project because there for example you can

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set exclude option.

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Now if you add exclude here that will be an array and what you can't enter here are paths to files which

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should not be included in computation when you run TSC on the entire project.

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So for example here we could say we want to exclude analytics teams from compilation.

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Now of course this does make much sense here.

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But just to show how this works if we do that we now rerun TSC and first of all delete analytics Chase

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so that we can see if it is recreated.

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If we now run TSC or TSC in watch mode you see no analytics chairs follows created the reason for that

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is that we're excluding that file.

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Now of course for this file this doesn't make a lot of sense because I typically want to include it.

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But if you had a file that for some reason shouldn't be compiled you can't execute it like this.

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You can also work with wildcards and for example if you had a file that's named analytics dot def dot

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t s and you don't want to compile that you could say all files that end with Def not test should not

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be compiled and you can do that by also adding an asterisk here which is a wildcard basically and now

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types will ignore any files that have dot def or T S included.

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You could also add asterisks asterisk slash here and that would mean any file with that pattern in any

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folder will be ignored.

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So these are things you can set up here.

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The only thing I want to set up here and that is a setting you will often find.

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Instead I want to exclude node modules.

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And the idea here is that I don't want to compile any typescript files I might have inside of node modules.

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Now node modules is that folder that holds all the dependencies we install here in packets Jason.

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And the dependencies of these dependencies and therefore these are third party libraries we're importing

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which we don't want to touch.

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And if any of these libraries should ship some typescript code then we certainly don't want to compile

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it.

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It will just slow down our accumulation process and in the worst case it might even break our project.

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So therefore it's quite common to exclude node modules here though I will say if you don't specify the

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execute option at all node modules is automatically excluded as a default setting.

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So you don't really need to add this option here.

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This would be the default.

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I just want to show that excluding exists and how you could use it if the only thing you want excellent

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is node modules you don't have to add the exclude key at all.

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If you do add it though you should set node modules because otherwise it will not exclude that.

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Now besides exclude.

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We also have include and include allows it to do the opposite.

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It allows you to specifically tell typescript which files you want to include in the compilation process

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and anything that's not listed here will not be compiled.

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So if a point at apt yes here you'll see if I rerun TSC we all will get no analytics t file or no analytics

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J as file I should say.

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Why.

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Because analytics J is not included in include and as I said if we do set to include key then we really

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have to include everything we want to compile.

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So of course here we could then also add analytics tests here and with that addition we would start

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and compile it as we see now we have the analytics chairs file or as an alternative we specify a whole

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folder here which typically holds the files we want to compile exclude by the way if set alongside include

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will filter down include.

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So if we exclude some sub folder of a folder with that as part of include then that excluded sub folder

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will be excluded.

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So basically we compile include minus exclude.

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Now of course here I don't want to set include I want to compile all types of files and therefore I

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don't have to worry about that excluding node modules is all I need and as I explained theoretically

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I don't even need to add that because that would be excluded by default.

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Now we also have a files option.

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This allows you to point at the individual files so it's a bit like include with the difference that

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here you can specify whole folders what you want to include instead.

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You really just specify the individual files you want to compile.

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That might be option for smaller projects where you know you will only work with free files and for

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some reason you've got a couple of other types good files which you don't want to touch though.

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Then you can set the list of files like this.

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In reality you might not need that setting that often though and therefore dates it with the basic compilation

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or project management options here.

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Now of course there is way more we can specify though way more we can specify about the compiler itself

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and how it behaves during the computation step.