Oddly, the TS Config is probably best described by the CLI which you can find in
src/compiler/commandLineParser.ts.
The CLI starts after parsing tsc.ts which triggers executeCommandLine. This function handles going
from an arg list to structured data in the form of ParsedCommandLine.
The actual work occurs in [parseCommandLineWorker][] which sets up some variables:
const options = {} as OptionsBase;
const fileNames: string[] = [];
const errors: Diagnostic[] = [];Then it starts If the letter is a - then start looking forwards to see if the arg is available in the optionmap
function executeCommandLine