tsconfig.json

{
	"include": ["src"],

	"compilerOptions": {
		"baseUrl": ".",
		"lib": ["DOM", "ESNext"],
		"module": "ESNext", // Must be esnext (for import() and import/export)
		"moduleResolution": "Node", // Must be node (to match webpack resolution)
		"resolveJsonModule": true, // Must be true (to match webpack loader)
		"isolatedModules": true, // Must be true (implementation limitation)
		"noEmit": true, // Must be true
		"jsx": "react-jsx", // Must be react-jsx (to support the new JSX transform in React 17)
		"typeRoots": ["node_modules/@types", "src/types"],
		"strict": true,
		"sourceMap": true,
		"allowJs": false,
		"forceConsistentCasingInFileNames": true,
		"noImplicitReturns": true,
		"noImplicitThis": true,
		"noImplicitAny": true,
		"importHelpers": true,
		"strictNullChecks": true,
		"suppressImplicitAnyIndexErrors": true,
		"allowSyntheticDefaultImports": true,
		"noUnusedLocals": true,
		"removeComments": true,
		"esModuleInterop": true
	}
}

// From create-react-app cli start command
// The following changes are being made to your tsconfig.json file:
//   - compilerOptions.target to be suggested value: es5 (this can be changed)
//   - compilerOptions.lib to be suggested value: dom,dom.iterable,esnext (this can be changed)
//   - compilerOptions.allowJs to be suggested value: true (this can be changed)
//   - compilerOptions.skipLibCheck to be suggested value: true (this can be changed)
//   - compilerOptions.esModuleInterop to be suggested value: true (this can be changed)
//   - compilerOptions.allowSyntheticDefaultImports to be suggested value: true (this can be changed)
//   - compilerOptions.strict to be suggested value: true (this can be changed)
//   - compilerOptions.forceConsistentCasingInFileNames to be suggested value: true (this can be changed)
//   - compilerOptions.noFallthroughCasesInSwitch to be suggested value: true (this can be changed)
//   - compilerOptions.module must be esnext (for import() and import/export)
//   - compilerOptions.moduleResolution must be node (to match webpack resolution)
//   - compilerOptions.resolveJsonModule must be true (to match webpack loader)
//   - compilerOptions.isolatedModules must be true (implementation limitation)
//   - compilerOptions.noEmit must be true
//   - compilerOptions.jsx must be react-jsx (to support the new JSX transform in React 17)