`parseMarkdown` can not parse codeblock correctly

[dusty-cjh]

I'm using nuxt-content, and want to dynamically render some markdown with out-of-box MDC supports.

{
    "@nuxt/content": "^3.7.1",
    "nuxt": "^3.19.3",
}

Phonomenon

1. pnpm run build works smooth for building nuxt-content pages, no error.
2. parserMarkdown failed when rendering mdc that contains code block, but works in other scenario.

Key code snippet:

import MDCRenderer from '@nuxtjs/mdc/runtime/components/MDCRenderer.vue'

const mdc = await import('@nuxtjs/mdc/runtime');
const parseMarkdown = mdc.parseMarkdown;
const parsed = await parseMarkdown(props.text, {
      highlight: true,
    });

Error:

ERROR  [unhandledRejection] Cannot read properties of undefined (reading 'map')                                                                                                                                       3:11:11 PM

    at compileToJSON (node_modules/.pnpm/@nuxtjs+mdc@0.18.0_magicast@0.3.5/node_modules/@nuxtjs/mdc/dist/runtime/parser/compiler.js:50:127)
    at node_modules/.pnpm/@nuxtjs+mdc@0.18.0_magicast@0.3.5/node_modules/@nuxtjs/mdc/dist/runtime/parser/compiler.js:50:142
    at Array.map (<anonymous>)
    at compileToJSON (node_modules/.pnpm/@nuxtjs+mdc@0.18.0_magicast@0.3.5/node_modules/@nuxtjs/mdc/dist/runtime/parser/compiler.js:50:127)
    at node_modules/.pnpm/@nuxtjs+mdc@0.18.0_magicast@0.3.5/node_modules/@nuxtjs/mdc/dist/runtime/parser/compiler.js:14:48
    at Array.map (<anonymous>)
    at compileToJSON (node_modules/.pnpm/@nuxtjs+mdc@0.18.0_magicast@0.3.5/node_modules/@nuxtjs/mdc/dist/runtime/parser/compiler.js:14:33)
    at Compiler (node_modules/.pnpm/@nuxtjs+mdc@0.18.0_magicast@0.3.5/node_modules/@nuxtjs/mdc/dist/runtime/parser/compiler.js:73:18)
    at Function.stringify (node_modules/.pnpm/unified@11.0.5/node_modules/unified/lib/index.js:1002:12)
    at node_modules/.pnpm/unified@11.0.5/node_modules/unified/lib/index.js:749:36

If you have any other question, or want me provide more info, please let me know.
Thanks a lot!

[farnabaz]

Do you mind providing a simple reproduction repository?
Without valid production it is pretty hard to debug and understand the issue.

[smart-trust]

this works:
parseMarkdown("```bash```");

this does not work:
parseMarkdown("```bash\n```");

downgraded to 0.17.4 and 0.16.1 -  failed on all.

also failed on:

 parseMarkdown(```ts\nclass C {\n  private name: string = \"foo\"\n}```) 

which is part of the test suite.

[smart-trust]

see also #422