tsconfig.json

{
  "compilerOptions": {
    // this is specific with augmented overrides
    "paths": {
      // this is the package name we use (in the interface imports, --package for generators)
      "sample-polkadotjs-typegen/*": ["src/*"],
      // here we replace the @polkadot/api augmentation with our own, generated from chain
      "@polkadot/api/augment": ["src/interfaces/augment-api.ts"],
      // replace the augmented types with our own, as generated from definitions
      "@polkadot/types/augment": ["src/interfaces/augment-types.ts"]
    },
    // some other options, whatever you want for your environment
    "target": "esnext",
    "module": "esnext",
    "jsx": "preserve",
    "declaration": true,
    "strict": true,
    "noImplicitAny": true,
    "noUnusedLocals": true,
    "noImplicitReturns": true,
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "baseUrl": ".",
    "skipLibCheck": true,
    "typeRoots": ["./node_modules/@types"],
    "outDir": "build"
  },
  "exclude": ["build/**/*", "node_modules"]
}