Add TypeScript declaration file

[favna]

Before I start I will say I would directly PR this since I have the code ready, however looking at your Package.json I cannot directly see how you're building so instead I'm giving it to you through issue so you can add it yourself. It would be nice if you could add this as TypeScript declaration file. It could be improved upon by removing some of the any types and replacing them with proper types but this should at least do for the basis and support import postcss from rollup-plugin-postcss

declare module 'rollup-plugin-postcss' {

    type FunctionType = (...args: any[]) => void;
  
    type PostCssPluginOptions = {
      extensions?: string[];
      plugins?: any[];
      inject?: boolean | any;
      extract?: boolean | string;
      modules?: boolean | any;
      autoModules?: boolean;
      namedExports?: boolean | FunctionType;
      minimize?: boolean | any;
      sourceMap?: boolean | 'inline';
      parser?: string | FunctionType;
      stringifier?: string | FunctionType;
      syntax?: string | FunctionType;
      exec?: boolean;
      config?: boolean | {
        path: string;
        ctx: any;
      };
      name?: any[] | any[][];
      loaders?: any[];
      onImport?: (id: any) => void;
    }
  
    function postcss(options: PostCssPluginOptions): void;
  
    export default postcss;
  }

[egoist]

🎉 This issue has been resolved in version 2.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[jednano]

You need to add this file to the files list of package.json or it will never be published.