tsconfig.json

{
	"compilerOptions": {
		// project options
		"lib": ["ESNext", "dom"], // specifies which default set of type definitions to use ("DOM", "ES6", etc)
		"outDir": "build", // .js (as well as .d.ts, .js.map, etc.) files will be emitted into this directory.,
		"removeComments": true, // Strips all comments from TypeScript files when converting into JavaScript- you rarely read compiled code so this saves space
		"target": "ES6", // Target environment. Most modern browsers support ES6, but you may want to set it to newer or older. (defaults to ES3)

		// Module resolution
		"baseUrl": "./", // Lets you set a base directory to resolve non-absolute module names.
		"esModuleInterop": true, // fixes some issues TS originally had with the ES6 spec where TypeScript treats CommonJS/AMD/UMD modules similar to ES6 module
		"moduleResolution": "node", // Pretty much always node for modern JS. Other option is "classic"
		"paths": {}, // A series of entries which re-map imports to lookup locations relative to the baseUrl

		// Source Map
		"sourceMap": true, // enables the use of source maps for debuggers and error reporting etc
		"sourceRoot": "/", // Specify the location where a debugger should locate TypeScript files instead of relative source locations.

		// Strict Checks
		"alwaysStrict": true, // Ensures that your files are parsed in the ECMAScript strict mode, and emit “use strict” for each source file.
		"allowUnreachableCode": false, // pick up dead code paths
		"noImplicitAny": true, // In some cases where no type annotations are present, TypeScript will fall back to a type of any for a variable when it cannot infer the type.
		"strictNullChecks": true, // When strictNullChecks is true, null and undefined have their own distinct types and you’ll get a type error if you try to use them where a concrete value is expected.

		// Linter Checks
		"noImplicitReturns": true,
		"noUncheckedIndexedAccess": true, // accessing index must always check for undefined
		"noUnusedLocals": true, // Report errors on unused local variables.
		"noUnusedParameters": true, // Report errors on unused parameters in functions
		"resolveJsonModule": true
	},
	"include": ["./**/*.ts"],
	"exclude": ["node_modules/**/*"]
}