Using build config make markdown mandatory to be set

[edimitchel]

Environment

N/A

Version

v3

Reproduction

Not an issue about reproduction but TypeScript

Description

When I want to add a transformer to my Nuxt Content application, adding the field transformers alone is making the validation of build type to fail.

  content: {
    build: {
//  ~~~~~ => missing markdown
      transformers: ['~~/transformers/article-metadata'],
    }
  },

I had to add markdown: {} to avoid the typescript error.

Additional context

No response

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