tsconfig.json

{
  "compilerOptions": {
    "target": "es2018",
    "module": "commonjs", /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
    "lib": [
      "es2018",
      "DOM"
    ], /* Specify library files to be included in the compilation. */
    "allowJs": true, /* Allow javascript files to be compiled. */
    "checkJs": true, /* Report errors in .js files. */
    "noEmit": true, /* Do not emit outputs. */
    /* Strict Type-Checking Options */
    "strict": true, /* Enable all strict type-checking options. */
    "esModuleInterop": true /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
  },
  "files": [
    "background.js"
  ],
  "types": [
    "chrome"
  ]
}