extension-develop/dist/webpack/plugin-extension/feature-manifest/manifest-overrides/common/background.d.ts

The develop step of Extension.js

import { type Manifest, type FilepathList } from '../../../../webpack-types';
export declare function backgroundPage(manifest: Manifest, excludeList: FilepathList): "" | {
    background: {
        page?: string | undefined;
        scripts?: string[] | undefined;
        persistent?: boolean | undefined;
        service_worker: string;
        type?: "module";
    };
} | undefined;