tsconfig.json

{
	"compilerOptions": {
		// Output options
		"outDir": "lib/esm",
		"jsx": "react", // import React style
		"declaration": true, // Generate .d.ts files
		"noEmit": true, // Don't want to output while typechecking

		// These two are just defaults, microbundle overrides for other builds
		"target": "esnext", // Compile to es5
		"module": "esnext", // Export esm syntax

		// Support requires in tests
		"moduleResolution": "node",
		// Supporting types for tests
		"types": ["node", "jest", "@testing-library/jest-dom"],

		// TS strictness
		"strict": true,
		"allowUnusedLabels": false,
		"allowUnreachableCode": false,
		"exactOptionalPropertyTypes": true,
		"noFallthroughCasesInSwitch": true,
		"noImplicitOverride": true,
		"noImplicitReturns": true,
		"noPropertyAccessFromIndexSignature": true,
		"noUncheckedIndexedAccess": true,
		"noUnusedLocals": true,
		"noUnusedParameters": true,

		// TSC config
		"checkJs": true, // Typecheck JS files
		"esModuleInterop": true, // Treat commonjs imports like esm
		"skipLibCheck": true, // Don't typecheck all deps, only the ones we directly use
		"forceConsistentCasingInFileNames": true // Force fs case sensitivity
	},
	"exclude": ["lib", "example"]
}