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🦋 Changeset detectedLatest commit: 7b7bb56 The changes in this PR will be included in the next version bump. This PR includes changesets to release 1 package
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Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe pull request adds Swift and PowerShell syntax highlighting, registers both languages, and adds showcase sources, tests, benchmarks, bundle-size profiles, and documentation. ChangesSwift and PowerShell support
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Merge Risk: ⚪ Minimal · up to No actionable merge-blocking risk remains. The new test has substantial margin below its timeout, and long code lines remain accessible on narrow screens. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Swift highlighting introduces quadratic scanning for long sequences of hash characters. Applications that highlight untrusted source or Markdown could suffer synchronous CPU exhaustion. HTML escaping and language-instance isolation remain intact, but deployment-level input limits and affected consumers are unknown. Retained concerns
Security review detailsSecurity Blast Radius
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 12.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 12 files. (4 skipped: 4 unsupported.)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/guides/performance.md:
- Line 21: Update the CI size figures in the performance guide paragraph to
match the table’s current 12.43 KB gzip measurement and 12.7 KB budget, or
clearly mark the 10,838-byte and 10,900-byte figures as historical.
Review comments at @src/languages/swift.ts:
- Around line 64-67: Update the Swift scanner around stringEnd so a rejected
hash run advances the outer scanner past the entire run instead of returning to
rescan from the next hash. Preserve the existing handling of hash runs followed
by a quote or slash.
Review comments at @test/showcases/Get-StationReport.ps1:
- Line 10: Make the `Limit` parameter in `Get-StationReport` control how many
stations the function emits, rather than relying on the later hard-coded
`Select-Object -First 5`. Apply the same change to the documented copy in
test/showcases/Get-StationReport.ps1 at lines 10-10 and
docs/guides/swift-and-powershell.md at lines 88-88.
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.changeset/swift-powershell.mdREADME.mddocs/config.jsondocs/guides/performance.mddocs/guides/swift-and-powershell.mddocs/language-support.mddocs/reference/languages.mddocs/test-strategy.mdscripts/bench.mjsscripts/generate-visual-compare.mjsscripts/measure-size.mjsscripts/test-package.mjssrc/index.tssrc/languages/index.tssrc/languages/powershell.tssrc/languages/swift.tstest/fixtures.tstest/real-doc-fixtures.test.tstest/showcases/Get-StationReport.ps1test/showcases/Observatory.swifttest/swift-powershell.test.ts
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Followed up on the three review findings in 7b7bb56:
Local Node 26.10.0 validation passed: CI run #61 is |
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Thanks for this. I have been adding a batch of other languages in #27 (Java, Kotlin, Rust, Ruby, C#, Dart, Lua, Perl) and left Swift out because this PR already covers it. To make sure the two fit together I ran the same checks I used there on this branch, with Claude's help: realistic docs-style samples for both languages, roughly 60k-character repeated-delimiter inputs for timing, and pnpm run verify.
The scanners held up on every nested string, raw string, and nested comment case I tried. The inline suggestions are the handful of things that came out of it. With all six applied, pnpm run verify still passes including the 127 existing tests, both languages stay under 20 ms on the timing inputs, and each language bundle gets about 15 gzip bytes smaller. Each comment carries an optional regression test that fails without its suggestion.
A few non-code things I noticed while comparing with how earlier languages were added (#17, #18):
scripts/language-utils.mjs(supportedLanguagesand thepwsh/ps1aliases),skills/configure-selective-highlighting/references/languages.md(this one ships in the npm package),docs/reference/default-entry.md("30 canonical language names"), anddocs/installation.md("roughly 11 KB gzip") do not mention the new languages yet.verifydoes not catch these.docs/guides/performance.mdre-measures the TSX, Octane, Docs, and theme-helper figures and rewrites the note about CI compression. Those profiles are not affected by this change, so the differences look like local Node/zlib variation; leaving the existing figures might make the diff easier to review.- The six screenshots under
docs/assets/swift-powershell/(about 1.3 MB) are not referenced from any docs page, only from the PR description. That is the maintainers' call; I am only flagging it becausedocs/has no binary assets today.
#27 and this PR edit the same shared lists and size numbers (README, the performance and test-strategy docs, scripts/measure-size.mjs, test/real-doc-fixtures.test.ts). If this lands first I will rebase #27 onto it.
| name: 'swift', | ||
| tokenize: patternTokenizer([ | ||
| { collect: collectSwiftLexicalRanges }, | ||
| { className: 'meta', regex: /#(?:if|elseif|else|endif|available|unavailable|selector|keyPath|sourceLocation|warning|error|fileID|filePath|file|line|column|function)\b/g }, |
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Freestanding macros such as #Preview { … }, #expect(…), #require(…) and #externalMacro(…) leave the # unclassified and the name as a function or plain text, while #available, #selector and #if get meta. Raw strings and extended regexes are already taken by the collector, so any remaining #name is a directive or macro expansion and the list can become one general pattern (which is also shorter).
| { className: 'meta', regex: /#(?:if|elseif|else|endif|available|unavailable|selector|keyPath|sourceLocation|warning|error|fileID|filePath|file|line|column|function)\b/g }, | |
| { className: 'meta', regex: /#[A-Za-z_]\w*/g }, |
Optional test:
it('classes every freestanding macro like the built-in directives', () => {
for (const text of ['#Preview', '#expect', '#externalMacro']) expect(classes(`${text}(x)`, text, 'swift')).toEqual(['meta'])
})| { className: 'attr', regex: /@[A-Za-z_]\w*/g }, | ||
| { className: 'variable', regex: /\$(?:\d+|[A-Za-z_]\w*)/g }, | ||
| { className: 'literal', regex: /\b(?:true|false|nil)\b/g }, | ||
| { className: 'keyword', regex: /\b(?:actor|any|as|associatedtype|async|await|borrowing|break|case|catch|class|consuming|continue|convenience|copy|default|defer|deinit|didSet|distributed|do|dynamic|each|else|enum|extension|fallthrough|fileprivate|final|for|func|get|guard|if|import|indirect|infix|init|inout|internal|in|is|isolated|lazy|let|mutating|nonisolated|nonmutating|open|operator|optional|override|package|postfix|precedencegroup|prefix|private|protocol|public|repeat|required|rethrows|return|self|set|some|static|struct|subscript|super|switch|throw|throws|try|typealias|unowned|var|weak|where|while|willSet)\b/g }, |
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Keywords are matched right after . and contextual keywords are matched when they are ordinary identifiers, which is common in docs code: .package(url: "…", from: "1.0.0") and let package = Package( in a Package.swift, case .default:, .open, .optional, x.copy(), var set = Set<Int>() and let copy = x all come out as keywords. This version skips keywords after . (except .self and .init) and stops treating the contextual words as keywords when they are followed by = or :, while open class, { get set }, private(set), package func, some View and async let still highlight as before. Since it is the same line, it also adds macro to the contextual words so public macro stringify<T>(…) declarations get a keyword.
| { className: 'keyword', regex: /\b(?:actor|any|as|associatedtype|async|await|borrowing|break|case|catch|class|consuming|continue|convenience|copy|default|defer|deinit|didSet|distributed|do|dynamic|each|else|enum|extension|fallthrough|fileprivate|final|for|func|get|guard|if|import|indirect|infix|init|inout|internal|in|is|isolated|lazy|let|mutating|nonisolated|nonmutating|open|operator|optional|override|package|postfix|precedencegroup|prefix|private|protocol|public|repeat|required|rethrows|return|self|set|some|static|struct|subscript|super|switch|throw|throws|try|typealias|unowned|var|weak|where|while|willSet)\b/g }, | |
| { className: 'keyword', regex: /\b(?:init|self)\b|(?<!\.)\b(?:as|associatedtype|await|break|case|catch|class|continue|default|defer|deinit|do|else|enum|extension|fallthrough|fileprivate|for|func|guard|if|import|inout|internal|in|is|let|operator|precedencegroup|private|protocol|public|repeat|rethrows|return|static|struct|subscript|super|switch|throw|throws|try|typealias|var|where|while|(?:actor|any|async|borrowing|consuming|convenience|copy|didSet|distributed|dynamic|each|final|get|indirect|infix|isolated|lazy|macro|mutating|nonisolated|nonmutating|open|optional|override|package|postfix|prefix|required|set|some|unowned|weak|willSet)\b(?!\s*[:=](?!=)))\b/g }, |
Optional test:
it('keeps member names and identifiers named like contextual keywords out of keywords', () => {
for (const [code, text] of [['let package = Package()', 'package'], ['[.package(url: "x")]', 'package'], ['style = .default', 'default'], ['var set = Set<Int>()', 'set']]) expect(classes(code, text, 'swift')).not.toContain('keyword')
for (const [code, text] of [['open class Box {}', 'open'], ['var v: Int { get { 1 } set {} }', 'set'], ['package func f() {}', 'package'], ['Foo.self', 'self'], ['super.init()', 'init'], ['public macro m() = #externalMacro(module: "M", type: "T")', 'macro']]) expect(classes(code, text, 'swift')).toEqual(['keyword'])
})| { className: 'keyword', regex: /\b(?:actor|any|as|associatedtype|async|await|borrowing|break|case|catch|class|consuming|continue|convenience|copy|default|defer|deinit|didSet|distributed|do|dynamic|each|else|enum|extension|fallthrough|fileprivate|final|for|func|get|guard|if|import|indirect|infix|init|inout|internal|in|is|isolated|lazy|let|mutating|nonisolated|nonmutating|open|operator|optional|override|package|postfix|precedencegroup|prefix|private|protocol|public|repeat|required|rethrows|return|self|set|some|static|struct|subscript|super|switch|throw|throws|try|typealias|unowned|var|weak|where|while|willSet)\b/g }, | ||
| { className: 'type', regex: /\b(?:actor|class|enum|protocol|struct|typealias)\s+([\p{L}_][\p{L}\p{N}_]*)/gu, group: 1 }, | ||
| { className: 'type', regex: /\b(?:Any|AnyObject|Array|Bool|Character|Dictionary|Double|Float|Int(?:8|16|32|64)?|Never|Optional|Result|Self|Set|String|UInt(?:8|16|32|64)?|Void)\b/g }, | ||
| { className: 'function', regex: /[\p{L}_][\p{L}\p{N}_]*(?=\s*\()/gu }, |
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The function pattern has no left boundary, so on a long identifier-like run it restarts at every character and goes quadratic: 60k characters of a take about 7.2 s here (_ 7.0 s, 1_ and 0x 3.5 s). Only starting at the beginning of an identifier brings all of them down to 1–5 ms.
| { className: 'function', regex: /[\p{L}_][\p{L}\p{N}_]*(?=\s*\()/gu }, | |
| { className: 'function', regex: /(?<![\p{L}\p{N}_])[\p{L}_][\p{L}\p{N}_]*(?=\s*\()/gu }, |
Optional test:
it('scans long identifier runs in linear time', () => {
const code = 'a'.repeat(100_000)
expect(classes(code, code, 'swift')).not.toContain('function')
}, 1000)| const close = quote + hashes | ||
| const escape = regex ? '\\' : '\\' + hashes | ||
| while (index < code.length) { | ||
| if (code.startsWith(close, index)) return index + close.length |
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A single-line " string never stops at a line break, so one stray quote keeps the string open and flips string parity for the rest of the block. With a bare regex literal such as
let r = /[^"]+/
let name = "Ada"
let ready = true"]+/ through let name = " becomes one string, Ada is left as code and let ready = true is coloured as a string. Ending non-""" strings at the newline keeps the damage to one line; interpolations have their own loop, so "\(items.map { spanning lines, multi-line strings, raw strings and extended regexes are unchanged.
| if (code.startsWith(close, index)) return index + close.length | |
| if (code.startsWith(close, index)) return index + close.length | |
| if (quote === '"' && /[\r\n]/.test(code[index])) return index |
Optional test:
it('ends single-line strings at the line break', () => {
const code = 'let r = /[^"]+/\nlet name = "Ada"\nlet ready = true'
expect(classes(code, '"Ada"', 'swift')).toEqual(['string'])
expect(classes(code, 'true', 'swift')).toEqual(['literal'])
})| tokenize: patternTokenizer([ | ||
| { collect: collectPowerShellLexicalRanges }, | ||
| { className: 'literal', regex: /\$(?:true|false|null)\b/gi }, | ||
| { className: 'variable', regex: /\$\{(?:`[\s\S]|[^}`])*\}|[$@](?:[\p{L}\p{N}_?]+:)?[\p{L}\p{N}_?]+|\$[$^]/gu }, |
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The ${…} alternative here backtracks on unterminated ${ runs: 60k characters of ${ take about 1.9 s ("${ about 1.3 s). The collector already emits every braced variable, so without the alternative ${my var}, ${env:ProgramFiles(x86)} and ${a`}b} keep exactly the same output and both inputs drop to a few ms. The only difference I found is that an escaped `${x} outside a string is no longer coloured as a variable, which matches PowerShell treating the escaped $ as literal text.
| { className: 'variable', regex: /\$\{(?:`[\s\S]|[^}`])*\}|[$@](?:[\p{L}\p{N}_?]+:)?[\p{L}\p{N}_?]+|\$[$^]/gu }, | |
| { className: 'variable', regex: /[$@](?:[\p{L}\p{N}_?]+:)?[\p{L}\p{N}_?]+|\$[$^]/gu }, |
Optional test:
it('scans unterminated braced variables in linear time', () => {
const code = '${'.repeat(50_000)
expect(classes(code, code, 'pwsh')).toEqual(['variable'])
}, 1000)| { className: 'literal', regex: /\$(?:true|false|null)\b/gi }, | ||
| { className: 'variable', regex: /\$\{(?:`[\s\S]|[^}`])*\}|[$@](?:[\p{L}\p{N}_?]+:)?[\p{L}\p{N}_?]+|\$[$^]/gu }, | ||
| { className: 'type', regex: /\[(?:[A-Za-z_]\w*\.)*[A-Za-z_]\w*(?:\[\])?\]/g }, | ||
| { className: 'keyword', regex: /(?<![\w-])(?:begin|break|catch|class|clean|continue|data|do|dynamicparam|else|elseif|end|enum|exit|filter|finally|for|foreach|function|if|in|param|process|return|switch|throw|trap|try|until|using|while|workflow|parallel|sequence|inlinescript)(?![\w-])/gi }, |
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Member names after . are matched as keywords because the lookbehind excludes word characters and - but not ., so $job.End, $proc.Process, $x.Begin and $y.Data highlight End, Process, Begin and Data as keywords. Adding . to the lookbehind makes them properties and leaves the statement keywords alone.
| { className: 'keyword', regex: /(?<![\w-])(?:begin|break|catch|class|clean|continue|data|do|dynamicparam|else|elseif|end|enum|exit|filter|finally|for|foreach|function|if|in|param|process|return|switch|throw|trap|try|until|using|while|workflow|parallel|sequence|inlinescript)(?![\w-])/gi }, | |
| { className: 'keyword', regex: /(?<![\w.-])(?:begin|break|catch|class|clean|continue|data|do|dynamicparam|else|elseif|end|enum|exit|filter|finally|for|foreach|function|if|in|param|process|return|switch|throw|trap|try|until|using|while|workflow|parallel|sequence|inlinescript)(?![\w-])/gi }, |
Optional test:
it('keeps member names out of keywords', () => {
for (const text of ['End', 'Process', 'Data']) expect(classes(`$job.${text}`, text, 'pwsh')).toEqual(['property'])
})2 participants
Swift and PowerShell fences currently fall back to plaintext. Add isolated
swiftandpowershelldefinitions (withpwshandps1aliases), default registration, and selective public imports.Swift handles nested comments, raw/multiline strings with nested interpolation protection, extended regex delimiters, attributes, actor/concurrency keywords, common types, and numeric bases. PowerShell handles quoted/here-strings, nested subexpressions, scoped/braced/splat variables, case-insensitive keywords and word operators, cmdlets, parameters, type literals, and numeric suffixes. Both preserve exact source text.
Add an actor-based observatory and advanced report pipeline as representative fixtures, documentation examples, benchmark inputs, and the first two samples in the existing Shiki comparison demo. Include a minor changeset and document the lightweight scope.
Validation:
pnpm run verify: passed on Node 26.10.0, including 124 tests, 34 documentation pages, five skills, package/packed runtime checks, 14 isolated public import bundles, 19 size profiles, and 12 benchmark profiles.pnpm run changeset:status: compatible minor release;git diff --check: passed.swiftc -frontend -parse test/showcases/Observatory.swift: passed. Full Swift typecheck is unavailable with the local SDK/toolchain mismatch; PowerShell runtime is not installed.pnpm run report:compare.Size tradeoff: Swift plus core is 3.36 KB gzip; PowerShell plus core is 3.27 KB. The all-language convenience entry grows from 10.77 KB to 12.43 KB gzip, and its explicit budget rises to 12.7 KB. Existing selective budgets remain unchanged.
Limits: interpolation is one string token; bare Swift regex literals, arbitrary custom operators, symbol resolution, and full PowerShell command/argument disambiguation are outside scope. Example API endpoints are placeholders. The existing comparison's Shiki reference remains light under its theme toggle; TanStack's showcased theme switches correctly.
Summary by CodeRabbit
pwshandps1.Rendered screenshot artifacts
Real browser captures of
pnpm run report:compare, using the committed showcase sources and the existing demo CSS. Desktop is 1440px wide; mobile is 390px. The left panel is TanStack Highlight, the right panel is Shiki. TanStack switches between GitHub Light and Aurora X; the existing Shiki reference remains light under the demo toggle. The six original PNGs are stored underdocs/assets/swift-powershell/and excluded from the published package.Swift's concurrency keywords, attributes, numeric literals, nested comments, and raw delimiters get distinct semantic colors. PowerShell's scoped variables, cmdlets, parameters, and here-string bodies stay visually distinct. Mobile stacks the comparison panels and scrolls long code lines within the block, without page overflow.
Aurora X
GitHub Light screenshots
Mobile screenshots (Swift light / PowerShell dark)
Minimal language and CSS setup
The themes generate CSS variables and
.th-*token selectors; the host app controls layout. This uses the same language/theme APIs as the captured demo:Screenshot-only follow-up: the six assets match the captured bytes exactly; documentation verification and package-exclusion verification passed. Full implementation verification above was run at
90acf0f; implementation files are unchanged in the screenshot commit.CI is blocked at GitHub's fork approval gate: the workflow explicitly says it is awaiting approval from a maintainer. A TanStack/highlight maintainer with write access must review and approve workflows for this PR before
verifyand the dependent Node runtime matrix can run. No approval, permission change, or rerun was attempted.