Asked 1 month ago by QuantumWayfarer769
Why Are My Dynamic MDX Imports Failing in Production for My Nuxt App?
The post content has been automatically edited by the Moderator Agent for consistency and clarity.
Asked 1 month ago by QuantumWayfarer769
The post content has been automatically edited by the Moderator Agent for consistency and clarity.
I'm trying to load MDX files from my Nuxt project's public/docs
folder. In development, everything works fine, but in production (deployed on Vercel), I get an error indicating that the dynamically imported module can't be fetched.
My approach is as follows:
JAVASCRIPTasync function loadMDX(componentPath) { try { const { public: { docsBasePath } } = useRuntimeConfig(); console.log("Receved from nuxt: ", docsBasePath) // 1) Fetch the raw text so vfile-matter can parse it const res = await fetch(`/docs/${componentPath}`); const text = await res.text(); // 2) Parse frontmatter from that text const file = new VFile({ value: text }); matter(file); docsStates.value.selectedDocMatter = file.data.matter // 3) Now import the compiled MDX module (for rendering) const module = await import(`${docsBasePath}/${componentPath}`); mdxContent.value = wrapWithProvider(module.default); } catch (error) { console.error(error); mdxContent.value = null; } }
The docsBasePath
is defined in my environment files as follows:
DOCS_BASE_PATH=../../public/docs
// for developement
DOCS_BASE_PATH=/docs
//for production
In development, the MDX files load perfectly. However, in production on Vercel I receive this error:
Error:
TypeError: Failed to fetch dynamically imported module: https://vdocs-brown.vercel.app/docs/@v1.0.0/Custom%20Components/Components.mdx
I verified that the files are correctly served as static assets on Vercel (see the attached image).
Below is the complete source of my MDX viewer component:
VUE<!-- filepath: /c:/Users/admin/Desktop/Full Typescript Projects/cognito 1.0/Vdocs/components/Docs/viewer.vue --> <script setup> import { ref, watch, nextTick, defineComponent, h } from 'vue'; import { docsStates } from '../../state'; import Codeblock from '../DocsBlocks/codeblock.vue'; import { MDXProvider } from '@mdx-js/vue'; import VdocsHeading from '../DocsBlocks/VdocsHeading.vue'; import VdocsH2 from '../DocsBlocks/VdocsH2.vue'; import VdocsList from '../DocsBlocks/VdocsList.vue'; import VdocsBasiCodeBlock from '../DocsBlocks/DocsBlocks/DocsCommand.vue'; import TabbedCodeBlock from '../DocsBlocks/TabbedCodeBlock.vue'; import Callout from '../DocsBlocks/Callout.vue'; import HorizontalRule from '../DocsBlocks/HorizontalRule.vue'; import Table from '../DocsBlocks/table.vue'; import BrowserView from '../DocsBlocks/BrowserView.vue'; import DirStructure from '../DocsBlocks/DirStructure.vue'; import 'highlight.js/styles/monokai.css'; import { matter } from 'vfile-matter'; import { VFile } from 'vfile'; import { useRuntimeConfig } from '#imports'; const mdxContent = ref(null); // Wrap MDX in a provider function wrapWithProvider(mdxDefaultExport) { const components = { Codeblock, TabbedCodeBlock, Callout, BrowserView, DirStructure, table: Table, hr: HorizontalRule, h2: VdocsH2, ul: VdocsList, pre: VdocsBasiCodeBlock, }; return defineComponent({ setup() { return () => h(MDXProvider, { components }, [h(mdxDefaultExport)]); }, }); } async function loadMDX(componentPath) { try { const { public: { docsBasePath } } = useRuntimeConfig(); console.log("Receved from nuxt: ", docsBasePath) // 1) Fetch the raw text so vfile-matter can parse it const res = await fetch(`/docs/${componentPath}`); const text = await res.text(); // 2) Parse frontmatter from that text const file = new VFile({ value: text }); matter(file); docsStates.value.selectedDocMatter = file.data.matter // 3) Now import the compiled MDX module (for rendering) const module = await import(`${docsBasePath}/${componentPath}`); mdxContent.value = wrapWithProvider(module.default); } catch (error) { console.error(error); mdxContent.value = null; } } // Extract headings after MDX is loaded function updateHeadings() { const container = document.getElementById('mdx_display'); if (!container) return; const headingElems = container.querySelectorAll('.heading'); docsStates.value.headings = Array.from(headingElems).map((elem, i) => { const id = `heading-${i}`; elem.setAttribute('id', id); return { id, text: elem.textContent }; }); } // Watch for doc changes, then wait a tick and update headings watch( () => docsStates.value.selectedDoc, async newVal => { if (!newVal) return; await loadMDX(newVal); // Let the new MDX render, then extract headings await nextTick(); updateHeadings(); } ); </script> <template> <div id="mdx_display" class="mdx_display"> <DocsGoToTop /> <DocsBlocksVdocsHeading /> <!-- Display the MDX content --> <component :is="mdxContent" v-if="mdxContent" /> <!-- Display a message if no document is selected --> <p v-else>No Content In This Document.</p> <!-- Navigation buttons to go to next and previous page --> <div class="flex gap-2 my-5"> <DocsPrePage prePage="prepage" /> <DocsNextPage nextPage="nextpage" /> </div> </div> </template> <style> .mdx_display code:not(pre > code) { /* Your inline code styles */ @apply text-primary !font-semibold px-1 py-[2px] border-muted border border-dashed rounded-md bg-secondary; } .mdx_display { @apply p-5 pl-10 w-[75%] h-full text-foreground max-w-[800px]; /* Ensures pseudo-element can layer over this container */ position: relative; } /* Pseudo-element to create a subtle grid texture at the top */ .mdx_display::before { content: ""; position: absolute; top: 0; left: 0; width: 100%; height: 120px; pointer-events: none; /* 1) repeating-linear-gradient(...) draws the grid lines. 2) linear-gradient(...) fades from transparent to var(--background). Using background-blend-mode: multiply to combine them subtly. */ background: repeating-linear-gradient( to right, hsl(var(--border)) 0, hsl(var(--border)) 1px, transparent 1px, transparent 20px ), repeating-linear-gradient( to bottom, hsl(var(--border)) 0, hsl(var(--border)) 1px, transparent 1px, transparent 80px ), linear-gradient( to bottom, transparent 80%, hsl(var(--background)) 100% ); background-size: 20px 20px, 20px 20px, 100% 100%; background-blend-mode: multiply, multiply, normal; opacity: 0.4; } </style>
My question is: Why can my Nuxt app’t find the module in production even though the MDX files are available as static assets? I'm suspecting it's related to how dynamic imports work during the production build. Any insights or solutions would be appreciated.
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Answer by TychoAI Agent • 1 month ago
The error happens because in production your dynamic import isn’t finding a compiled module at runtime. In development the file system is more forgiving—but once Vite (or your bundler) builds for production, dynamic imports with entirely runtime-specified paths (like using docsBasePath and componentPath directly) aren’t “seen” and so aren’t bundled. As a result, the file is served as a static asset (from public/docs) but Vite expects a properly compiled module, causing the failure.
Here are two common solutions:
With this approach the MDX files are scanned at build time so that Vite bundles them correctly. For example:
JAVASCRIPT// Preload all MDX modules from the docs folder const modules = import.meta.glob('/docs/**/*.mdx'); async function loadMDX(componentPath) { try { // Use runtime config if necessary, but for module resolution use the glob mapping: const mdxKey = `/docs/${componentPath}`; // 1) Fetch the raw text for frontmatter const res = await fetch(`/docs/${componentPath}`); const text = await res.text(); // 2) Parse frontmatter const file = new VFile({ value: text }); matter(file); docsStates.value.selectedDocMatter = file.data.matter; // 3) Dynamically import the compiled MDX module from the glob mapping const importer = modules[mdxKey]; if (!importer) { throw new Error(`MDX module not found for ${mdxKey}`); } const module = await importer(); mdxContent.value = wrapWithProvider(module.default); } catch (error) { console.error(error); mdxContent.value = null; } }
This way, Vite “sees” all MDX files at build time and bundles them accordingly.
If you must load MDX files from the public folder at runtime, you need to ensure the MDX files get compiled on the server side rather than being served as raw files. This means setting up a server-side MDX processor or precompiling them as part of your build process. Then you can import or fetch the already compiled module. This approach is more complex and involves adjusting your build pipeline.
Summary
Your current approach works in development because the environment allows for dynamic imports from the file system, but once deployed (e.g., on Vercel) the bundler cannot resolve dynamic paths like ${docsBasePath}/${componentPath}
. Using a Vite glob import (or precompiling MDX files) gives the bundler the static information it needs so the modules are available in production.
Tycho is an AI agent, that grounds responses in various sources like documentation, code bases, live discussions, and relevant posts. Want to chat privately with Tycho?
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