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perf(kirari): stream JSX, TSX, and JSONC in checkpoint mode - #1
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A name's function check can read past a `/` on the last line, where it is division only until more input turns it into a regex literal. A streamed `a` before `</]/>(` stayed a variable once the line was checkpointed, while batch tokenization made it a generic call. The lookahead now reports a pending answer when it passes a slash after the source's last line break.
Generated sources and chunk sizes now shrink to a minimal counterexample with a replay seed. `bun test` runs 300 cases per language plus fixed regression examples; `bun run test:fuzz` runs 20,000 to search for rare mismatches while adding a language. Adds JSONC, JSX, and TSX properties.
JSONC joins the rule-based checkpoint path. JSX and TSX rescan from the last root-level newline outside elements, carrying the previous token and script scan context, instead of retokenizing all source on every write. Resume points after a rejected sibling element are dropped, since the sibling may close once more source arrives. Streaming 8 KB of TSX one character at a time drops from about 13 s to about 0.2 s.
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WalkthroughThe change adds resumable checkpoint scanning for JSX and TSX, includes JSONC in checkpoint mode, and updates streamed slash lookahead. Tests, fuzz coverage, performance checks, package metadata, CI, and documentation are also updated. ChangesStreaming tokenizer changes
Priority: ⚪ Pending latest changes Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Stream
participant scanJsx
participant markup
Stream->>scanJsx: scan from resume offset
scanJsx->>markup: source and resume configuration
markup->>Stream: report valid checkpoints
markup-->>scanJsx: scanned tokens
scanJsx-->>Stream: scanned tokens
Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
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| Description Check |  |
Check skipped - CodeRabbit’s high-level summary is enabled. |
| Title check | |
The title clearly and concisely describes the main change: enabling checkpoint-mode streaming for JSX, TSX, and JSONC in Kirari. |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1… |
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No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 11 files.
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A rabbit streams through JSX lines
Checkpoints mark the safe designs
JSONC joins the steady flow
Slash clues wait for more to show
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Tokens return in the proper place
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Actionable comments posted: 2
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Inline comments:
Review comments at @packages/kirari/src/grammars/functions.ts:
- Around line 30-33: Cache the last-line position once per source and reuse it
across createFunctionLookup calls, rather than repeating the backward scan
through the final line for each JSX expression. Update the surrounding lookup
state while preserving the existing newline detection and position semantics.
Review comments at @packages/kirari/test/language-performance.test.ts:
- Line 19: Update the performance assertion in the language performance test to
remove the unsupported fixed two-second wall-clock limit; use a threshold
validated across supported CI runners or assert scaling without relying on a
fixed elapsed-time value, while preserving the test’s existing timeout.
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packages/kirari/src/grammars/functions.tspackages/kirari/test/language-performance.test.tspackages/kirari/test/stream.test.ts
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Review comments at @.github/workflows/ci.yml:
- Line 24: Align the CI matrix and compatibility documentation: update the
Node.js version matrix near node to include both 24 and 26, or revise
CONTRIBUTING.md to accurately describe a Node.js 26-only CI matrix while
preserving Node.js 24 as a documented compatibility target.
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What and why
createTokenStreamused full mode for JSX, TSX, and JSONC, so every write retokenized all accumulated source. That is the most common case for streamed LLM output: streaming 8 KB of TSX one character at a time took about 13 s. It now takes about 0.2 s, and streamed tokens still equal batch tokenization after every write.markupscan. Resume points are root-level newlines outside elements, and each one carries the previous token and the script scan context. A sibling element that is rejected may still close once more source arrives, so resume points after it are dropped. A long element is rescanned from its opening line until it closes.main): a name's function lookahead could pass a/on the last line that later input turns into a regex literal, for exampleabefore</]/>(. The streamed result stayed final and differed from batch tokenization. The lookahead now stays pending until that line ends.bun testruns 300 cases per language plus fixed regression examples.bun run test:fuzzruns 20,000 per language for adding new languages; it passes clean for all seven checkpoint languages.Copies or extensions of the built-in definitions still use full mode. No public API changes. The bundle grows by about 50 B gzip for core and about 330 B for all languages.
Checklist
bun run checkpassesbunx changeset), or not needed for docs, tests, or internal changesSummary by CodeRabbit