new·The score now tells you which way it movedA brain's exam only ever grows: its own material writes questions, and so does every question a real caller asked and did not get answered. The score is a percentage over that growing set, so a brain that learned more could post a smaller number — and this week three did. One of them answered two MORE questions than the week before and showed eighteen points less. Printed as a single percentage, that reads as decline to a reader and as punishment to anyone who contributes material.all news →
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explore / Backend & APIs / mozg / Bun

Bun · Bundler

Answer questions about the Bun bundler: Bun.build and its exact options, loaders, plugins, macros, and the executables and CSS features.

408 notes · updated 2026-08-13 · trained 92%

since last sitting: +27 newly passed — this brain is learning · the verified changelog →

use this brain
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$ claude mcp add --transport http mozg \
https://mozg.sh/mcp --header "Authorization: Bearer …"
> use mozg/bun-bundler — …
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Ask it things like

answers 26/28 on its latest exam · anti-bluff 1/2
What is the return type of Bun.build(), and what properties does it include?Bun.build() API core✓
What must be true about macro arguments at compile time?Macros✓
What is the difference between onResolve and onLoad hooks?Plugins & hooks✓
What is the syntax for the --compile flag, and what does it create?Standalone executables✓
How does the define option work, and what is the difference between it and --define CLI flag?Build options & configuration✓
What does the splitting option do in Bun.build(), and when should I enable it?Build options & configuration✓
When I call Bun.build() with both entry points and publicPath, which one prefixes the module paths in the output?Bun.build() API core✓
What is the main benefit of bytecode caching with --bytecode?Bytecode caching✓

What it can answer

28 coverage checks
92%
Answers 27 of the exam's 30 questionsIt answers 27 questions, 27 more than last time, out of an exam that grew by 30.Nothing it used to answer has stopped working.
✓Build options & configuration3 / 3
✓Bun.build() API core3 / 3
✓Bytecode caching3 / 3
✓CSS bundling3 / 3
✓Loaders & file handling3 / 3
▲Macros3 / 4
✓Plugins & hooks3 / 3
▲Standalone executables3 / 4
✓CLI flags & behavior2 / 2
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Attacks survived

re-run weekly · 2026-08-11
✓gate-battery12/12 known hostile payloads caught by the ingest gate
✓injection-corpusevery active note scanned — no steering language
✓secret-corpusevery active note scanned — no keys or credentials

heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability

Inside

  • Bun.serve() development as object with console logging · js api
  • Inline environment variables configuration · bundler/behavior
  • HTML import syntax for routes · js api
  • Bun.serve() development option features · js api
  • Ahead of Time Bundling for fullstack apps · executables and compilation
  • TailwindCSS plugin for Bun.serve · plugins
  • Bun.serve() routes option with HTML imports · js api
  • HTML routes processing with HTMLRewriter · bundler/behavior
  • API endpoints in Bun.serve() routes · js api
  • Dynamic routes with URL parameters · js api
  • Development vs Production mode comparison · bundler/behavior
  • Runtime bundling in production with development: false · bundler/behavior
  • Plugins in bunfig.toml for Bun.serve static routes · plugins
  • Sourcemap configuration in bunfig.toml · bundler/behavior

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.