tsconfig.json

{
    "compilerOptions": {
        "resolveJsonModule": true,
        "target": "es6" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019', 'ES2020', or 'ESNEXT'. */,
        "module": "esnext" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', 'es2020', or 'ESNext'. */,
        "lib": ["dom", "esnext", "ES2021.String"] /* Specify library files to be included in the compilation. */,
        "jsx": "react" /* Specify JSX code generation: 'preserve', 'react-native', 'react', 'react-jsx' or 'react-jsxdev'. */,
        "removeComments": true /* Do not emit comments to output. */,

        /* Strict Type-Checking Options */
        /* Enable all strict type-checking options. */
        "strictNullChecks": true,

        /* Module Resolution Options */
        "moduleResolution": "node" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
        "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */,

        /* Advanced Options */
        "skipLibCheck": true /* Skip type checking of declaration files. */,
        "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */,

        "types": ["chrome", "node", "firefox-webext-browser"]
    },
    "include": ["src"],
    "exclude": ["src/extension_service_worker.ts", "node_modules"]
}