tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",                       /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */
    "module": "NodeNext",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */
    "jsx": "react-jsx",                       /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
    "jsxImportSource": "preact",
    "declaration": true,                      /* Generates corresponding '.d.ts' file. */
    "declarationMap": true,                   /* Generates a sourcemap for each corresponding '.d.ts' file. */
    "sourceMap": true,                        /* Generates corresponding '.map' file. */
    "outDir": "./dist/preact",
    "rootDir": "./src/",
    "isolatedModules": true,
    "lib": ["ESNext", "DOM", "DOM.Iterable", "ES2021", "ES2021.String"],
    "exactOptionalPropertyTypes": false,    
    "strict": true,                            /* Enable all strict type-checking options. */
    "moduleResolution": "NodeNext",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
    "skipLibCheck": true,                      /* Skip type checking of declaration files. */
    "forceConsistentCasingInFileNames": true,  /* Disallow inconsistently-cased references to the same file. */
    "preserveWatchOutput": true,
    "types": []
  },
  "include": ["./src"],
  "exclude": ["./node_modules", "./src/util/lib-react.tsx"]
}