tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "module": "ESNext",
    "moduleResolution": "Bundler",
    // Allow importing TypeScript files using their native extension (.ts(x)).
    "allowImportingTsExtensions": true,
    // Enable JSON imports.
    "resolveJsonModule": true,
    // Enforce the usage of type-only imports when needed, which helps avoiding bundling issues.
    "verbatimModuleSyntax": true,
    // Ensure that each file can be transpiled without relying on other imports.
    // This is redundant with the previous option, however it ensures that it's on even if someone disable `verbatimModuleSyntax`
    "isolatedModules": true,
    "forceConsistentCasingInFileNames": true,
    // Properly support importing CJS modules in ESM
    "esModuleInterop": true,
    // Allow JSX files (or files that are internally considered JSX, like Astro files) to be imported inside `.js` and `.ts` files.
    "jsx": "preserve",
    "allowJs": true,
    "checkJs": true,
    "strict": true,
    "noImplicitAny": true,
    "skipLibCheck": true,
    "declaration": true
  },
  "include": ["lib/**/*.js", "**/*.ts"],
  "exclude": ["node_modules", "**/coverage/*"]
}