postcss-normalize

const plugin: Plugin;

type Plugin = {
    (pluginOptions?: PluginOptions): {
        postcssPlugin: 'postcss-normalize';
        Once(root: PostCSS.Root): void;
        postcssImport: {
            load(filename: string, importOptions: any): {};
            resolve(id: string, basedir: string, importOptions: any): {};
        };
    };
    postcss: true;
};

type PluginOptions = {
    /** Determines whether multiple, duplicate insertions are allowed */
    allowDuplicates?: boolean;
    /** Defines an override of the project’s browserslist for this plugin. */
    browsers?: string;
    /** Defines whether imports from this plugin will always be inserted at the beginning of a CSS file. */
    forceImport?: boolean;
};