@bentley/build-tools/tsconfig-base.json

{
  "compilerOptions": {
    "target": "es2017",
    "lib": [
      // Required for async iterators/generators:
      "esnext.asynciterable",
      // These are the defaults for "target": "es2017", but they have to be explicitly specified if we want to add anything to "lib":
      "es2017",
      "dom",
      "dom.iterable",
      "scripthost"
    ],
    "module": "commonjs",
    "stripInternal": false,
    "declaration": true,
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "noUnusedLocals": false,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noImplicitOverride": true,
    "noFallthroughCasesInSwitch": false,
    "experimentalDecorators": true,
    "skipLibCheck": true,
    "sourceMap": true,
    "inlineSources": true,
    "declarationMap": true,
    "jsx": "react",
    "forceConsistentCasingInFileNames": true,
    "incremental": true
  }
}