tsconfig.json

{
  "compilerOptions": {
    "target": "es2017",
    "module": "commonjs",
    "lib": ["dom", "es2017"],
    "declaration": true,
    "declarationMap": true,
    "composite": true,
    "emitDeclarationOnly": true,
    // blocked by https://github.com/chalk/chalk/pull/390
    // "isolatedModules": true,
    "importsNotUsedAsValues": "error",

    "strict": true,

    /* Additional Checks */
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,

    /* Module Resolution Options */
    "moduleResolution": "node",
    /* This needs to be false so our types are possible to consume without setting this */
    "esModuleInterop": false,
    "resolveJsonModule": true
  },
  "exclude": [
    ".yarn/releases/*",
    "**/__tests__/**/*",
    "**/__mocks__/**/*",
    "**/build/**/*",
    "**/build-es5/**/*"
  ]
}