Thetsconfig.jsonfile is always placed in the root of your project and you can customize what rules you want the TypeScript compiler to enforce. Here’s thetsconfig.jsonfile we provide in every single exercise and project in our Learn TypeScript course:

{  "compilerOptions": {    "target": "es2017",    "module": "commonjs",    "strictNullChecks": true  },  "include": ["**/*.ts"]}
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{  "compilerOptions": {    "target": "es2017",    "module": "commonjs",    "strictNullChecks": true  },  "include": ["**/*.ts"]}

In theJSON, there are several properties:

• "compilerOptions", which is a nested object that contains the rules for the TypeScript compiler to enforce."target", the value"es2017"means the project will be using the 2017 version of EcmaScript standards for JavaScript."module", this project will be using"commonjs"syntaxto import and export modules."strictNullChecks", variables can only havenullorundefinedvalues if they are explicitly assigned those values.
• "include"that determines what files the compiler applies the rules to. In this case["**/*.ts"]means the compiler should check every single file that has a.tsextension.

We chose these rules because we wanted to give you an idea of what rules to enforce and still allow your creativity to shine. For your own projects, you can set these rules to your own preferences! Thetsconfig.jsonfile is great for both individual work and team projects because it allows everyone to be on the same page about how to write their code.

Usage

Another neat addition is that by including atsconfig.jsonfile, you can now use the commandtscwithout any arguments in your terminal! The compiler will automatically recognize from yourtsconfig.jsonfile, what specific files to run on. You can still provide specific files liketsc fileName.tsif that’s the only file you want the compiler to check.

Wrap up

Check out TypeScript’scompiler option documentationfor even more information.

Happy Coding! And remember, when in doubt,typeit out!

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