Gatsby: feat(gatsby): override default options of gatsby-plugin-page-creator

[wardpeet]

Summary

When a user specifies a gatsby-plugin-page-creator plugin with a path pointing to src/pages we replace the config of our default gatsby-plugin-page-creator in gatsby core. This allows people to add ignore options.

A step in the right direction:
1) open https://github.com/gatsbyjs/gatsby/blob/abf888147de0c87d5c8560eaf2de18a0da4b5fca/packages/gatsby/src/bootstrap/load-plugins/load.js
2) find a gatsby-plugin-page-creator plugin with the path pointing to src/pages and temporary save the config in a variable
3) Replace the options on line (https://github.com/gatsbyjs/gatsby/blob/abf888147de0c87d5c8560eaf2de18a0da4b5fca/packages/gatsby/src/bootstrap/load-plugins/load.js#L217) with your variable.
4) write tests to make sure this works correctly.

Basic example

// in gatsby-config.js
{
  plugins: [{
    resolve: require.resolve(`gatsby-plugin-page-creator`),
    options: {
      path: `${__dirname}/src/pages`,
      ignore: [`**/examples/**`],
    },
  }]
}

Should change the default gatsby-plugin-page-creator config in
https://github.com/gatsbyjs/gatsby/blob/abf888147de0c87d5c8560eaf2de18a0da4b5fca/packages/gatsby/src/bootstrap/load-plugins/load.js#L214-L222

Outcome should be

  plugins.push(
    processPlugin({
      resolve: require.resolve(`gatsby-plugin-page-creator`),
      options: {
        path: slash(path.join(program.directory, `src/pages`)),
        ignore: [`**/examples/**`],
      },
    })
  )

Motivation

We get a lot of requests to override the default gatsby-plugin-page-creator plugin. At this point we don't offer a good solution for this problem, there is a workaround but it's not fixing all use cases.

[akshayymahajan]

Hey @wardpeet! I would like to work on this issue.

[wardpeet]

Nice! Please let us know if we can assist with anything. We suggest opening a draft/WIP PR if you having questions so we can give pointers on specific areas.

Thank you for contributing! ❤️

[akshayymahajan]

My PR is failing e2e tests even though all other tests are passing in my local dev environment. Any idea @wardpeet

[sidharthachatterjee]

Fixed and published in [email protected] thanks to @akshayymahajan 🥇

[karlhorky]

Thanks @sidharthachatterjee @akshayymahajan @wardpeet !

This is working with the following config in my gatsby-config.js (needed to remove the require.resolve from @wardpeet's first description):

{
  resolve: `gatsby-plugin-page-creator`,
  options: {
    path: `${__dirname}/src/pages`,
    ignore: [`**/examples/**`],
  },
},

[siddharthkp]

@karlhorky We meet again! Put you've got the wrong Sid this time 😛 (you want @sidharthachatterjee)

[karlhorky]

🤦‍♂️ Ah oops, sorry Siddharth! Tagged Sidhartha now.