UI: Fix copying line breaks with Twoslash codeblocks

.changeset/mean-lines-wave.md

@@ -0,0 +1,5 @@
+---
+'fumadocs-ui': patch
+---
+
+Fix copying line breaks with Twoslash codeblocks

apps/docs/content/docs/ui/manual-installation.mdx

@@ -177,10 +177,72 @@ If you want to deploy your Fumadocs app using Docker with **Fumadocs MDX configu
 The following snippet is taken from the official [Next.js Dockerfile Example](https://github.com/vercel/next.js/blob/canary/examples/with-docker/Dockerfile):
 
 ```zsh title="Dockerfile"
+# syntax=docker.io/docker/dockerfile:1
+
+FROM node:18-alpine AS base
+
+# Install dependencies only when needed
+FROM base AS deps
+# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
+RUN apk add --no-cache libc6-compat
 WORKDIR /app
 
-# Install dependencies based on the preferred package manager
+# Install dependencies based on the preferred package manager [!code highlight]
 COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* .npmrc* source.config.ts ./
+RUN \
+  if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
+  elif [ -f package-lock.json ]; then npm ci; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \
+  else echo "Lockfile not found." && exit 1; \
+  fi
+
+
+# Rebuild the source code only when needed
+FROM base AS builder
+WORKDIR /app
+COPY --from=deps /app/node_modules ./node_modules
+COPY . .
+
+# Next.js collects completely anonymous telemetry data about general usage.
+# Learn more here: https://nextjs.org/telemetry
+# Uncomment the following line in case you want to disable telemetry during the build.
+# ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN \
+  if [ -f yarn.lock ]; then yarn run build; \
+  elif [ -f package-lock.json ]; then npm run build; \
+  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm run build; \
+  else echo "Lockfile not found." && exit 1; \
+  fi
+
+# Production image, copy all the files and run next
+FROM base AS runner
+WORKDIR /app
+
+ENV NODE_ENV=production
+# Uncomment the following line in case you want to disable telemetry during runtime.
+# ENV NEXT_TELEMETRY_DISABLED=1
+
+RUN addgroup --system --gid 1001 nodejs
+RUN adduser --system --uid 1001 nextjs
+
+COPY --from=builder /app/public ./public
+
+# Automatically leverage output traces to reduce image size
+# https://nextjs.org/docs/advanced-features/output-file-tracing
+COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
+COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static
+
+USER nextjs
+
+EXPOSE 3000
+
+ENV PORT=3000
+
+# server.js is created by next build from the standalone output
+# https://nextjs.org/docs/pages/api-reference/config/next-config-js/output
+ENV HOSTNAME="0.0.0.0"
+CMD ["node", "server.js"]
 ```
 
 This ensures Fumadocs MDX can access your configuration file during builds.

packages/ui/src/components/codeblock.tsx

@@ -82,7 +82,7 @@ export const CodeBlock = forwardRef<HTMLElement, CodeBlockProps>(
 
       const clone = pre.cloneNode(true) as HTMLElement;
       clone.querySelectorAll('.nd-copy-ignore').forEach((node) => {
-        node.remove();
+        node.replaceWith('\n');
       });
 
       void navigator.clipboard.writeText(clone.textContent ?? '');
@@ -118,9 +118,7 @@ export const CodeBlock = forwardRef<HTMLElement, CodeBlockProps>(
             <figcaption className="flex-1 truncate text-fd-muted-foreground">
               {title}
             </figcaption>
-            {allowCopy ? (
-              <CopyButton className="-me-2" onCopy={onCopy} />
-            ) : null}
+            {allowCopy && <CopyButton className="-me-2" onCopy={onCopy} />}
           </div>
         ) : (
           allowCopy && (