tsconfig.json

{
    "compilerOptions": {
      "target": "ES2017",
      "module": "commonjs",
      "declaration": true,
      "declarationMap": true,
      "sourceMap": true,
      "outDir": "./dist",
      "strict": true,
      "rootDirs": ["./src", "./test"],
      "esModuleInterop": true
    },
    // "files": [], // Any hardhat plugin's main .d.ts has to be added here
    "exclude": ["dist", "node_modules"],
    "include": [
      "./test",
      "./src"
    ]
  }