perf(svelte): reuse incremental parsing in streams - #396
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Architecture 
2 components touched across 2 lanes. Inside the changed components — 2 viewsComponent view — Svelte streaming adapter Svelte Markdown components managing serialized parser instances and error boundaries 
Component view — Core parser task serialization Serialized task queue and incremental AST block reuse engine 
Data flow 
The other flows — 1 sequence
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comark
@comark/angular
@comark/ansi
@comark/html
@comark/nuxt
@comark/react
@comark/svelte
@comark/vue
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: defaults Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (2)
🚧 Files skipped from review as they are similar to previous changes (2)
Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe change adds serialized streaming parsers, preserves parser errors, expands full-parse conditions for headings and references, integrates the behavior into Svelte components, and adds tests and documentation. ChangesStreaming parser and Svelte integration
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MarkdownComponent
participant createSerializedMarkdownParser
participant createSerializedTask
participant parseFn
participant SvelteBoundary
MarkdownComponent->>createSerializedMarkdownParser: create parser from derived options, plugins, and unwrap
MarkdownComponent->>createSerializedTask: submit streaming parse
createSerializedTask->>parseFn: run serialized parse
parseFn->>parseFn: reuse completed blocks or perform full parse
parseFn-->>MarkdownComponent: return document or rejection
MarkdownComponent-->>SvelteBoundary: render document or expose parser error
Merge Risk: ⚪ Minimal · up to No current merge-blocking risk was identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@packages/comark-svelte/src/components/Markdown.svelte`:
- Around line 75-77: Update the parseMarkdown flow in Markdown so rejected
parser promises are routed through the component’s Svelte boundary error path
instead of becoming unhandled or leaving stale parsed content. Use
Svelte-managed error state or an await-based boundary-aware approach, and add
rejecting-plugin coverage for Markdown alongside the existing MarkdownAsync
test.
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ℹ️ Review info
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Configuration used: defaults
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📒 Files selected for processing (13)
docs/content/3.rendering/6.svelte.mdexamples/2.vite/svelte/src/pages/Syntax.sveltepackages/comark-svelte/README.mdpackages/comark-svelte/src/async/MarkdownAsync.sveltepackages/comark-svelte/src/components/Markdown.sveltepackages/comark-svelte/test/incremental-streaming.svelte.test.tspackages/comark-svelte/test/test-components/MarkdownBoundary.sveltepackages/comark/src/internal/parse/token-processor.tspackages/comark/src/parse.tspackages/comark/src/utils/helpers.tspackages/comark/test/streaming.test.tspackages/comark/test/utils/create-serialized-task.test.tstest/bundle.test.ts
Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.
📦 Bundle size snapshot is out of dateThe published size of one or more packages changed, so the inline snapshot in Please review the diff below. If the change is expected, accept the new snapshot:
Only maintainers with write access can trigger the update. You can also comment Bundle size diff FAIL test/bundle.test.ts > package bundle size > published size of each package
Error: Snapshot `package bundle size > published size of each package 1` mismatched
- Expected
+ Received
@@ -2,9 +2,9 @@
"@comark/angular": "56.2k (72 files)",
"@comark/ansi": "37.3k (98 files)",
"@comark/html": "16.5k (58 files)",
"@comark/nuxt": "11.8k (58 files)",
"@comark/react": "37.7k (76 files)",
- "@comark/svelte": "44.9k (84 files)",
+ "@comark/svelte": "45.7k (84 files)",
"@comark/vue": "56.0k (80 files)",
"comark": "368k (158 files)",
}
❯ test/bundle.test.ts:61:20
59| }
60|
61| expect(report).toMatchInlineSnapshot(`
| ^
62| {
63| "@comark/angular": "56.2k (72 files)",
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2 participants
What
Keep a serialized parser in Svelte streaming components so each update reuses completed blocks. Reset it when parser settings change and parse the full source when streaming ends. Use a full parse for heading tails and reference definitions to preserve IDs and links.
Why
Svelte currently parses the entire source on each update, as discussed in #135. Also clear stale frontmatter when a stream switches documents. Fix the Syntax playground's
valueprop so it renders the example.Related #397.
Parser timings for the shared React/Svelte call pattern, using the published PR code:
Summary by CodeRabbit
New Features
Bug Fixes
Documentation