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…n.ansi, correct two JSDoc statements - docs/runtime/yaml.mdx: restore the Bun.YAML.stringify() section that #22921 added to docs/api/yaml.md and the docs move (#24201) dropped. - docs/runtime/markdown.mdx: the page listed three APIs. Bun.markdown.ansi() is the fourth. Add it to the list and add a section for it. - docs/runtime/markdown.mdx, bun.d.ts: autolinks follow md4c's permissive autolink rules, not the cmark-gfm autolink extension. Say so, and list the inputs that cmark-gfm links and Bun does not. - bun.d.ts: the YAML.stringify cycle sample showed &1 / *1. The output is &root / *root.
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Status: ready for review. The diff touches How it was checked, on
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Priority: ⬇️ Low Merge Risk: 🟡 Moderate · up to The documentation and test changes do not add runtime behavior, but the unresolved public type declaration mismatch should be addressed before merge. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@packages/bun-types/bun.d.ts`:
- Line 1556: Update the YAML stringify declaration’s return type in stringify to
include undefined, matching the host function’s behavior for undefined,
function, and symbol inputs while preserving string returns for serializable
values.
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I reviewed this PR and didn't find any bugs. The packages/bun-types/ change is CODEOWNER-gated, so a human sign-off is still needed.
What was reviewed:
Bun.markdown.ansi()theme option names and defaults checked againstsrc/runtime/api/MarkdownObject.rs:137-168—colors/hyperlinks/kittyGraphics/light/columnsall match, includingcolumns: 0disabling wrap.- The "always enables" list for
ansi()matchesmd::Options::TERMINALinsrc/md/root.rs:94-105. YAML.stringifyclaims (replacer throws on non-null/undefined,spaceclamped to 10 for numbers and strings,undefinedinput returnsundefined, anchor names&root/&<propName>) checked againstsrc/runtime/api/YAMLObject.rs.autolinksDefault: falsematchesmd::Options::default().
Extended reasoning...
Overview
This PR is documentation and JSDoc only: it restores a Bun.YAML.stringify() section in docs/runtime/yaml.mdx (~170 lines), adds a Bun.markdown.ansi() section plus an autolink-rules clarification in docs/runtime/markdown.mdx, and fixes two JSDoc statements in packages/bun-types/bun.d.ts (the YAML.stringify cycle example output and the Bun.markdown autolink description). No runtime code is touched.
Security risks
None. The change is prose and code examples in .mdx files plus comment-only edits inside bun.d.ts. Nothing executes at runtime, and none of the examples are security-adjacent (no credentials, no TLS options, no shell invocations that would be unsafe to copy).
Level of scrutiny
Per the repo's docs conventions, the main review burden is factual accuracy: option names, defaults, and example outputs must match the implementation. I spot-checked each new claim against source: the ansi() theme option table matches render_to_ansi in MarkdownObject.rs (defaults colors: true, hyperlinks: false, kittyGraphics: false, light from detect_light_background() reading COLORFGBG, columns: 80 with <= 0 → 0); the fixed-options list matches Options::TERMINAL; the YAML replacer behavior, space clamping (num_f > 10.0 / space_str.trunc(10)), undefined early return, and anchor-name derivation from ValueOrigin all match YAMLObject.rs; and autolinks defaults to false in md::Options::default(). The prose follows the repo voice guide (present tense, "Bun writes…", no "simply/just", named subjects). Code fences look balanced.
Other factors
.github/CODEOWNERS assigns packages/bun-types/ and *.d.ts to a named owner, so per the approval guidelines I'm deferring rather than approving even though the .d.ts edits are inside JSDoc comments only. The PR description also flags a merge overlap with #39925 at the same insertion point in yaml.mdx, which whoever merges second will need to reconcile.
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Updated 5:22 PM PT - Sep 12th, 2026
✅ @robobun, your commit 3aff0b210fc85ce63638eb705c580c0ba9555d0d passed in 🧪 To try this PR locally: bunx bun-pr 42526That installs a local version of the PR into your bun-42526 --bun |
…t with its comments The test takes the @example block from the JSDoc of YAML.stringify, runs it with bun -e, and compares stdout with the comment lines under each console.log(). It fails with the bun.d.ts of main, which shows &1 / *1. Two older tests build a 1,000,000-deep chain. On debug and ASAN builds they now build 100,000 levels: the loop takes 2.8 s there, and the second test hit the 5 s limit in a whole-file run. Those builds overflow below 5,000 levels.
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LGTM — docs, JSDoc, and test-only change with claims that check out against the runtime.
What was reviewed:
Bun.markdown.ansi()theme option names and defaults matchsrc/runtime/api/MarkdownObject.rs(colors: true,hyperlinks: false,columns: 80,lightviadetect_light_background(),kittyGraphics: false);autolinksdefaultfalseand the "permissive" naming matchsrc/md/root.rs.- The updated
YAML.stringifyJSDoc cycle output (&root/obj:/*root) matches the existing inline snapshot at test/js/bun/yaml/yaml.test.ts:4310, and the new example-verification test's line-matching logic traces correctly (trailing-space trim covers thekey: \ncase, no trailing newline fromstringify). overflowDepthbranching onisDebug || isASANfollows the repo convention for slow-build thresholds; 100,000 stays well above the ~5,000 debug overflow point noted in the comment.
Extended reasoning...
Overview
This PR restores the Bun.YAML.stringify() section to docs/runtime/yaml.mdx (lost in a docs reorganization), adds a Bun.markdown.ansi() section to docs/runtime/markdown.mdx with a theme-options table, adds a paragraph clarifying that Bun's autolinks follow md4c's permissive rules rather than cmark-gfm's GFM extension, corrects two JSDoc blocks in packages/bun-types/bun.d.ts (the YAML.stringify cycle example output and the markdown autolinks description), and updates test/js/bun/yaml/yaml.test.ts with a test that runs the JSDoc example verbatim plus an overflowDepth constant that reduces deep-nesting iterations under debug/ASAN. No native code is touched.
Security risks
None. The change is documentation prose, JSDoc comments inside .d.ts, and a test that spawns bunExe() -e on a code block extracted from the repo's own bun.d.ts. There is no user-controlled input, no auth/crypto/permissions surface, and no network access.
Level of scrutiny
Low-to-moderate. The repo's landing-prs guidance for "Docs, types, and comments" asks that every code snippet run as written and every option name/default be checked against the implementation. I spot-checked the load-bearing claims: the ansi() theme option names and defaults line up with MarkdownObject.rs:137-163; permissive_autolinks defaults to false in src/md/root.rs; the &root / obj: / *root block-style anchor output is confirmed by the existing inline snapshot in the same test file; and YAML.stringify(..., null, 2) returns no trailing newline (per existing .toBe(...) assertions), so the new example-comparison test's [...documented, ""] shape is correct. The docs prose follows the repo voice rules (present tense, "Bun" as actor, no "will"/"simple"/"just", positive phrasing where it recommends an action).
Other factors
The second commit (pushed after the earlier review) added the JSDoc-example test and the overflowDepth split — both follow harness conventions exactly (bunExe()/bunEnv, await using, Promise.all draining stdout/stderr/exited, stderr asserted before exitCode, isDebug/isASAN branching for slow-build thresholds). The only third-party thread was a CodeRabbit COMMENTED note that the author replied to and resolved; there is no CHANGES_REQUESTED review outstanding. All required imports (file, join, bunExe, bunEnv, isASAN, isDebug) are already present in the test file.
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Note for the If #42591 lands first, the bullet here needs that wording in place of "or a string to use as the indentation ... so use a string of spaces". If this PR lands first, #42591 updates the bullet. |
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Problem
docs/runtime/yaml.mdxhas noBun.YAML.stringify()section. docs: Add missing YAML.stringify() documentation #22921 added one (172 lines) todocs/api/yaml.md. The docs move (Replace old docs with new docs repo #24201) did not carry it over.docs/runtime/markdown.mdx:10says Bun "provides three APIs".Bun.markdown.ansi()is the fourth, andbun.d.tsalready lists four. The page has no section for it.packages/bun-types/bun.d.tsdo not match the runtime. TheYAML.stringifycycle sample shows&1/obj: *1, and the output is&root/obj:/*root. TheBun.markdownsummary lists autolinks under "GFM extensions", and the rules are md4c's permissive autolinks.Fix
Bun.YAML.stringify()section inyaml.mdx. Thereplacerandspacebullets say what the runtime does today.Bun.markdown.ansi()to the list inmarkdown.mdx, with a section for it. Under "Autolinks", name the rules and list four inputs that cmark-gfm links and Bun does not.Default: falseand the same note toOptions.autolinks.test/js/bun/yaml/yaml.test.tsruns thebun.d.tsexample and compares the output with its comments. It fails onmain. I ran every other new sample on1.4.3-canary.1+6a92015fc. There is no runtime change.Background
src/md/is a port of (feat(md): Zig markdown parser with Bun.markdown API #26440). Its "permissive autolinks" link bare URLs,www.names and e-mail addresses.mailto:andxmpp:URIs.Bun.markdown.ansi(input, theme?)shipped with Add markdown ANSI pretty-printer forbun ./file.md#28833, with JSDoc only.Notes
YAML samples. A script takes the six runnable
tsblocks of the new section from the.mdxfile, runs each one, and compares the output with the comment lines. All six match. The only difference from the page is a space afterkey:before a line break, which a comment cannot show. A round trip throughBun.YAML.parsegives back shared identity for the shared-reference sample and for the cycle, in flow style and in block style.replacer.nullandundefinedare accepted.0,5,"x",true,{},[]and a function all throwYAML.stringify does not support the replacer argument.space.20gives 10 spaces. A string of 15 spaces gives 10.0,""and-3give flow style."\t"givesa: \n\tb: 1, whichBun.YAML.parserejects withTab characters cannot be used as indentation. The bullet tells the reader to use spaces. It does not say what Bun does with other strings, so it stays true whichever way that is decided.bun.d.ts:1524is not changed here. #42483 fixes the indent of a collection in a sequence item for aspaceother than 2. The samples on the page all use 2.Autolinks. cmark-gfm's own 32-paragraph autolink example (
test/extensions.txt) gives different HTML for 23 of the 32 paragraphs with{ autolinks: true }. The four cases on the page are from that run, and I checked each one on its own:mailto:user@example.com,https://example.com/å,"https://example.com",http://localhost:3000. The 11 examples of the GFM spec's autolink section match in 10 cases. The other one is the doubled local part that #42510 fixes.<https://example.com/å>,<mailto:user@example.com>and<http://localhost:3000>all link.ansi().src/runtime/api/MarkdownObject.rs:115readscolors,hyperlinks,kittyGraphics,lightandcolumnsfrom the second argument and always parses withOptions::TERMINAL(src/md/root.rs:94): tables, strikethrough, task lists, the three autolink kinds, wiki links, underline, LaTeX math.bun ./file.mdcalls the samemd::render_to_ansi(src/runtime/cli/run_command.rs:3467). The{ colors: false }sample prints exactly"Hello\n=====\n\ndocs (https://bun.com)\n".Overlap. #39925 (the
replacerargument) adds its ownBun.YAML.stringify()section toyaml.mdxat the same place. Whichever lands second needs a small merge.The new test. It takes the
@exampleblock from the JSDoc ofYAML.stringifyinpackages/bun-types/bun.d.ts, runs it withbun -e, and compares stdout with the// ...lines under eachconsole.log(). Trailing spaces are not compared. With thebun.d.tsofmainit fails: the comments say&1andobj: *1, and the run prints&root,obj:and*root.Two older tests in the same file.
handles stack overflow protectionandstack overflow protection in the write passeach build a 1,000,000-deep object chain. That loop takes 2.8 s on a debug build with ASAN. In a whole-file run there, the second test took 4.7 to 6.5 s and hit the 5 s limit in 3 of 4 runs, with and without this change. On debug and ASAN builds both tests now build 100,000 levels and take 0.3 s and 0.6 s.YAML.stringifyoverflows below 5,000 levels on those builds. A Linux release build overflows between 30,000 and 50,000 levels and keeps the 1,000,000.Return type. A review comment is correct that
YAML.stringify()returnsundefinedforundefined, a function and a symbol, and that the declaration saysstring. #39925 already changes the signature tostring | undefinedand updatesfixture/yaml.ts. This PR leaves the signature alone.Types test.
bun test test/integration/bun-types/bun-types.test.tsgives the same 11 pass and 10 fail with and without this change. The 10 failures are@types/nodeshape errors in files this PR does not touch. Thebun-typesworkflow fails the same way onmain(runs 34683714288 and 34726049611), and #42230 is the open fix. Thebun.d.tsedits are inside comments.[human-review] gate passed · iteration 1 · 4 files touched
fails on main (without fix)
passes on PR (with fix)
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gate history · 1 passed · 1 rejected · iteration 1
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