svelte/tsconfig.json

{
	"include": ["src/**/*"],

	"compilerOptions": {
		"rootDir": "src",

		// target node v8+ (https://node.green/)
		// the only missing feature is Array.prototype.values
		"lib": ["es2017", "DOM", "DOM.Iterable"],
		"target": "es2017",

		// silences wrong TS error, we don't compile, we only typecheck
		"outDir": "./irrelevant/unused",

		"declaration": true,
		"declarationDir": "types",

		"noEmitOnError": true,
		"noErrorTruncation": true,

		"allowJs": true,
		"checkJs": true,

		// rollup takes care of these
		"module": "esnext",
		"moduleResolution": "node",
		"resolveJsonModule": true,
		"allowSyntheticDefaultImports": true,

		// Hides exports flagged with @internal from the d.ts output
		"stripInternal": true,

		// TODO: error all the things
		//"strict": true,
		"noImplicitThis": true,
		"noUnusedLocals": true,
		"noUnusedParameters": true,
		"typeRoots": ["./node_modules/@types"]
	}
}