tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "lib": ["esnext"],
    "module": "esnext",
    // output .d.ts declaration files for consumers
    "declaration": true,
    "emitDeclarationOnly": true,
    "allowJs": true,
    // output .js.map sourcemap files for consumers
    "sourceMap": true,
    "allowSyntheticDefaultImports": true,
    // match output dir to input dir. e.g. dist/index instead of dist/src/index
    "rootDir": "./src",
    "outDir": "./dist",
    "allowImportingTsExtensions": true,
    // stricter type-checking for stronger correctness. Recommended by TS
    "strict": true,
    // linter checks for common issues
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    // noUnused* overlap with @typescript-eslint/no-unused-vars, can disable if duplicative
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    // use Node's module resolution algorithm, instead of the legacy TS one
    "moduleResolution": "node",
    // interop between ESM and CJS modules. Recommended by TS
    "esModuleInterop": true,
    // significant perf increase by skipping checking .d.ts files, particularly those in node_modules. Recommended by TS
    "skipLibCheck": true,
    // error out if import and file system have a casing mismatch. Recommended by TS
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true,
    "composite": true,
    "baseUrl": "." /* Skip type checking all .d.ts files. */
  },
  "include": ["src/**/*", "src/**/*.json"]
}