gatsby-plugin-manifest: Include required config in gatsby-config.js

[harry643]

I'm a Gatsby beginner. I was going through the Gatsby interactive command-line setup and chose the 'Generate a manifest' option. After setup, I run gatsby develop and I get an error:

This is because the required config that gatsby-plugin-manifest needs is not in gatsby-config.js. It is currently this that causes the problem:

module.exports = {
 plugins: ["gatsby-plugin-manifest"],
};

My proposal is to include a basic config in gatsby-config.js if you choose the 'Generate a manifest' option during setup so you can run the project with no problems. Like this from the gatsby-plugin-manifest page:

module.exports = {
plugins: [
{
      resolve: `gatsby-plugin-manifest`,
      options: {
        name: `GatsbyJS`,
        short_name: `GatsbyJS`,
        start_url: `/`,
        background_color: `#f7f0eb`,
        theme_color: `#a2466c`,
        display: `standalone`,
        icon: `./src/images/icon.png`,
      }

This does require creation of the images folder and a default icon image.

[LekoArts]

Thanks for highlighting that, we're aware of it and track it as a bug now here: #28613