tsconfig.base.json

{
  "files": [],
  "compilerOptions": {
    // Interop Constraints
    // ===================
    "esModuleInterop": true, // require to import hh plugins and access hre.ethers
    "allowSyntheticDefaultImports": false,
    "forceConsistentCasingInFileNames": true,
    "verbatimModuleSyntax": false, // not practical in a CommonJS module

    // Type checking
    // =============
    "strict": true,
    "allowUnreachableCode": false,
    "allowUnusedLabels": false,
    "exactOptionalPropertyTypes": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": true,
    "noImplicitOverride": true,
    "noImplicitReturns": true,
    "noPropertyAccessFromIndexSignature": false, // Otherwise call like contract.getACLAddress() will fail.
    "noUncheckedIndexedAccess": false, // idem
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "useDefineForClassFields": true,
    "useUnknownInCatchVariables": true,

    // Modules
    // =======
    // Hardhat is built using CommonJS and expects plugins to be require()-able.
    "module": "CommonJS",
    "moduleResolution": "node10",
    "resolveJsonModule": true, // we need to resolve JSON files
    "rootDirs": ["./src", "./test"],

    // Language and Environment
    // ========================
    "target": "ES2021", // Setting this to `ES2021` enables native support for `Node v16+`: https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping.
    "lib": ["es2020", "ES2021.String"],

    // Completeness
    // ============
    "skipLibCheck": true
  }
}