tsconfig.json

{
  "compilerOptions": {
    "target": "es2018",
    "module": "commonjs",
    "lib": ["es6", "dom"],
    "declaration": true,
    "outDir": "dist",
    "rootDir": "src",
    "strict": true,
    // https://github.com/microsoft/TypeScript/wiki/Performance#controlling-types-inclusion:
    "types": ["jest"],
    "esModuleInterop": true,
    // Prevent developers on different OSes from running into problems:
    "forceConsistentCasingInFileNames": true,
    // Advanced Options
    "stripInternal": true
  },
  "include": ["src/**/*.ts"],
  "exclude": [
    "**/node_modules",
    // These end-to-end tests reference code in `.codesandbox`,
    // which is not part of this project and should not be compiled together with it.
    // Not excluding this will lead to the root of the repository being used
    // as the root directory for compilation (instead of /src),
    // meaning that files that would otherwise be included in /dist directly
    // (e.g. dist/index.d.ts) will then be built to /dist/src.
    "e2e",
    "**/*.test.ts",
    "src/tests.internal.ts"
  ]
}