tsconfig.json is the config file for every TypeScript project. It tells the TypeScript compiler what to check and how to build your code. Run tsc --init to create one. The key options you need to know are target, module, strict, outDir, and rootDir. Always turn on strict mode. It saves you from many bugs.
What is tsconfig.json?
tsconfig.json is a file that lives at the root of your TypeScript project. It controls how TypeScript compiles your code.
When you run tsc in your terminal, TypeScript looks for this file first. It reads your settings and uses them to type-check and compile your .ts files.
Without this file, the TypeScript compiler uses its default settings. Those defaults are not always the best for your project. That is why you should always create and customize your own tsconfig.json.
