fix(mdx): Disable in-memory cache for development

[sfanahata]

DESCRIBE YOUR PR

Problem:

• Problem: MDX files in /docs directory required server restart to see changes
• Root Cause: The getFileBySlugWithCache function was caching MDX files even in development
• Solution: Added development mode check to bypass cache when NODE_ENV === 'development'
• Impact: Hot reload now works for .mdx files while preserving production performance

Solution

• Bypass MDX cache in development mode to allow hot reload
• Maintains caching behavior in production for performance
• Resolves issue where MDX changes required server restart

IS YOUR CHANGE URGENT?

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• Urgent deadline (GA date, etc.):
• Other deadline:
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SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
develop-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 12, 2025 7:59am
sentry-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 12, 2025 7:59am

[codecov]

Bundle Report

Changes will increase total bundle size by 141 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-client-array-push	9.82MB	-2 bytes (-0.0%) ⬇️
sentry-docs-server-cjs	11.91MB	143 bytes (0.0%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: sentry-docs-client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
static/chunks/pages/_app-*.js	-3 bytes	879.57kB	-0.0%
static/chunks/1831-*.js	-3 bytes	422.11kB	-0.0%
server/app/api/ip-*.js	1 bytes	259.13kB	0.0%
server/app/_not-*.js	1 bytes	259.12kB	0.0%
server/app/[[...path]]/page_client-*.js	1 bytes	259.08kB	0.0%
server/app/platform-*.js	1 bytes	244.62kB	0.0%
static/1jDYZ1MP__ENFnugCaJvE/_buildManifest.js (New)	684 bytes	684 bytes	100.0% 🚀
static/1jDYZ1MP__ENFnugCaJvE/_ssgManifest.js (New)	77 bytes	77 bytes	100.0% 🚀
static/Ti_7Tl8aOw9Jb9v_6tDbb/_buildManifest.js (Deleted)	-684 bytes	0 bytes	-100.0% 🗑️
static/Ti_7Tl8aOw9Jb9v_6tDbb/_ssgManifest.js (Deleted)	-77 bytes	0 bytes	-100.0% 🗑️

view changes for bundle: sentry-docs-server-cjs

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
1729.js	-3 bytes	1.67MB	-0.0%
../instrumentation.js	-41 bytes	996.74kB	-0.0%
9523.js	-3 bytes	972.72kB	-0.0%
../app/[[...path]]/page.js.nft.json	65 bytes	705.76kB	0.01%
../app/platform-redirect/page.js.nft.json	65 bytes	705.68kB	0.01%
../app/sitemap.xml/route.js.nft.json	65 bytes	703.65kB	0.01%
../app/[[...path]]/page.js	1 bytes	592.68kB	0.0%
4217.js	1 bytes	191.33kB	0.0%
9273.js	1 bytes	84.57kB	0.0%
../app/platform-redirect/page.js	1 bytes	31.66kB	0.0%
9567.js	-9 bytes	20.65kB	-0.04%

Files in 9567.js:

• ./src/mdx.ts → Total Size: 24.14kB

App Routes Affected:

App Route	Size Change	Total Size	Change (%)
/platform-redirect	1 bytes	2.58MB	0.0%
/[[...path]]	1 bytes	3.14MB	0.0%

[BYK]

I'll change one little thing before merging but this is definitely the right place and the right approach. Will approve and merge tomorrow morning.