Add TSRX syntax highlighting

[tannerlinsley]

Adds dedicated TSRX/Octane language support instead of falling back to plaintext.

Changes

• Recognizes tsrx with the octane alias
• Highlights TypeScript/JSX plus Octane @{} component bodies and template directives
• Supports line-start markup inside Octane component bodies
• Adds modular exports, docs, real TanStack fixture coverage, and regression tests

Validation

• Typecheck and build
• 48 tests across 7 files
• Docs, skills, package exports, and publint checks
• All bundle-size budgets
• Benchmark target: 10,020 blocks at 45.12 blocks/ms

Summary by CodeRabbit

• New Features

  • Added TSRX language support, including the octane alias.
  • Added syntax highlighting for TSRX component shorthand and template directives.
  • TSRX is now available through language registration, normalization, listing, and highlighting APIs.

• Documentation

  • Updated language support guides, examples, and reference tables to include TSRX.

• Bug Fixes

  • Improved JSX detection and highlighting when syntax begins at the start of a line or appears inside template interpolations.

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds the tsrx language with Octane alias support, TSRX-specific directive and shorthand highlighting, improved JSX-at-line-start detection, highlighter registration, tests, and documentation updates.

Changes

TSRX language implementation

Layer / File(s)	Summary
TSRX tokenization and JSX detection src/internal/script.ts, src/languages/tsrx.ts	Adds TSRX directive and @{ shorthand tokenization, with line-start JSX detection propagated through script and template ranges.
Registration and behavioral validation src/index.ts, src/languages/index.ts, scripts/*, test/*	Registers tsrx and the octane alias, updates package checks, and tests normalization, tokenization, and context handling.
Language catalog and usage documentation README.md, docs/*, skills/*	Documents the TSRX export, alias, language support, shared highlighter configuration, and updated language count.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant createHighlighter
  participant tsrx
  participant collectScriptRanges
  participant Tests
  Tests->>createHighlighter: Register tsrx
  createHighlighter->>tsrx: Tokenize source
  tsrx->>collectScriptRanges: Collect script and JSX ranges
  collectScriptRanges-->>tsrx: Return token ranges
  tsrx-->>createHighlighter: Add TSRX keyword ranges
  createHighlighter-->>Tests: Return highlighted tokens

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change: adding TSRX syntax highlighting.
Description check	✅ Passed	The description matches the required template and includes both Changes and Validation with concrete details.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch taren/add-tsrx-highlighting

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[coderabbitai]

🧹 Nitpick comments (1)

test/regressions.test.ts (1)

155-170: 🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

Cover line-start JSX-looking lexical content.

Add multiline template-string and block-comment cases where <Tag /> starts a physical line; this directly exercises jsxAtLineStart and ensures lexical ranges still win over JSX tags.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@test/regressions.test.ts` around lines 155 - 170, Add multiline
template-string and block-comment cases to the regression test covering `<Tag
/>` at physical line start, asserting it remains lexical content rather than
being tokenized as JSX. Ensure the cases exercise `jsxAtLineStart`, preserve
lexical-range precedence, and continue verifying reconstructed output.

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@test/regressions.test.ts`:
- Around line 155-170: Add multiline template-string and block-comment cases to
the regression test covering `<Tag />` at physical line start, asserting it
remains lexical content rather than being tokenized as JSX. Ensure the cases
exercise `jsxAtLineStart`, preserve lexical-range precedence, and continue
verifying reconstructed output.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fed2106b-fe9c-4abf-b638-4441f864ea9c

📥 Commits

Reviewing files that changed from the base of the PR and between d6b4904 and ce2b104.

⛔ Files ignored due to path filters (1)

• test/generated/tanstack-doc-fixtures.json is excluded by !**/generated/**

📒 Files selected for processing (15)

• README.md
• docs/guides/octane.md
• docs/language-support.md
• docs/reference/languages.md
• scripts/language-utils.mjs
• scripts/test-package.mjs
• skills/_artifacts/domain_map.yaml
• skills/configure-selective-highlighting/references/languages.md
• src/index.ts
• src/internal/script.ts
• src/languages/index.ts
• src/languages/tsrx.ts
• test/fixtures.ts
• test/modular.test.ts
• test/regressions.test.ts