Default layouts are not working with `gatsby-theme-mdx-deck`

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Description

// gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: 'gatsby-theme-mdx-deck',
      options: {
        contentPath: './src/decks',
        basePath: '/',
      }
    },
    {
      resolve: `gatsby-source-filesystem`,
      options: {
        name: `decks`,
        path: `${__dirname}/src/decks/`,
      },
    },
    {
      resolve: `gatsby-plugin-page-creator`,
      options: {
        path: `${__dirname}/src/decks`,
      },
    },
    {
      resolve: `gatsby-plugin-mdx`,
      options: {
        defaultLayouts: {
          default: require.resolve(`./src/components/Layout.js`),
        }
      }
    }
  ]
}

// Layout.js
import React from 'react'
import HeaderButton from './HeaderButton'

export default ({ children }) => (
  <>
    <HeaderButton />

    { children }
  </>
)

Syntax Error: SyntaxError: unknown: Identifier '_frontmatter' has already been declared (111:13)

  109 | MDXContent.isMDXComponent = true;
  110 |
> 111 | export const _frontmatter = {};
      |              ^
  112 |

Contributor guide

Research direction

Investigate the conflict between gatsby theme mdx deck and gatsby plugin mdx when defaultLayouts are used. The error 'Identifier frontmatter has already been declared' suggests duplicate exports. Check how mdx deck generates MDX content and whether it already defines frontmatter, leading to a clash with gatsby plugin mdx default layouts.

Tech stack

javascriptreact

Domain

frontend

Issue type

Bug

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

2

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

JavaScriptReactGatsbyMDX

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

70