tsconfig.json

{
  "compilerOptions": {
    "target": "es2021",                                /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', 'ES2021', or 'ESNEXT'. */
    "module": "commonjs",                           /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    "outDir": "./build",                            /* Redirect output structure to the directory. */
    "rootDir": "./",                             /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
    "declaration": true,
    "declarationMap": false,
    "emitDecoratorMetadata": true,
    "esModuleInterop": true,
    "experimentalDecorators": true,
    "forceConsistentCasingInFileNames": true,
    "lib": ["es6"],
    "moduleResolution": "node",
    "noImplicitAny": true,
    "removeComments": true,
    "resolveJsonModule": true,
    "skipLibCheck": true,                           /* Skip type checking of declaration files. */      /* Disallow inconsistently-cased references to the same file. */
    "sourceMap": false,
    "strict": true
  },
  "include": ["*.ts", "**/*.ts", "artifacts/*.json"],
  "files": ["./hardhat.config.ts"],
  "exclude": ["./build", "node_modules"]
}