tsconfig.json

{
  "compilerOptions": {
    "target": "ES2015",
    "module": "commonjs",
    "moduleResolution": "node",
    "declaration": true,
    "pretty": true,
    "rootDir": "src",
    "sourceMap": false,
    "strict": true,
    "strictNullChecks": true,
    "esModuleInterop": true,
    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "resolveJsonModule": true,
    "downlevelIteration": true,
    "noErrorTruncation": true,
    "alwaysStrict": true,
    "diagnostics": true,
    "suppressImplicitAnyIndexErrors": false,
    "outDir": "lib",
    "lib": [
      "es2018",
      "dom"
    ],
    "baseUrl": "./src",
    "importHelpers": true,
    "plugins": [
      {
        "transform": "@zerollup/ts-transform-paths"
      }
    ]
  },

  "include": ["src/**/*"],
  "exclude": [
    "node_modules",
    "lib",
    "esm"
  ]
}