tsconfig.json

{
  "compilerOptions": {
    "target": "es2016",
    "allowJs": true,
    "checkJs": true,
    "esModuleInterop": true,                             /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
    // "preserveSymlinks": true,                         /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
    "forceConsistentCasingInFileNames": true,            /* Ensure that casing is correct in imports. */

    /* Type Checking */
    "strict": true,
    "skipLibCheck": false,
    "emitDeclarationOnly": true,
    "declaration": true,
    "moduleResolution": "nodenext",
    "noImplicitAny": false
  },
  "include": ["add-on/src/**/*.js", "add-on/src/**/*.ts"]
}