As we have seen, there are lots of different switches that we can apply to the compilation process, and repeatedly specifying these on the command line is a little clunky. Luckily, we can specify these options in a file called tsconfig.json. The compiler options we have looked at in previous sections are defined in a compilerOptions field without the "--" prefix.

Let's take a look at an example:

1. Let's create a tsconfig.json file with the following content:

{
  "compilerOptions": {
    "target": "esnext",
    "outDir": "dist",
    "module": "es6",
    "moduleResolution": "node",
    "sourceMap": true,
    "noImplicitReturns": true,
    "noImplicitAny": true
  }
}

2. Let's run a compile without specifying the source file and any flags:

tsc

The compilation will run fine, with the transpiled JavaScript being output to the dist folder along with a source map file.