[naheel0]

What

Adds TypeScript error pattern matching to errlens, closing #84.

Changes

• lib/database.json: Added ~20 TS-specific error patterns (TS2322, TS2339, TS2345, TS2305, TS7006, TS2551, TS2554, TS2304, TS2531, TS2532, TS2349, TS2769, TS2694, TS18046, TS7053, TS2464, TS1005, TS1128, TS1434) — all use plain substring matching (no regex)
• locales/en.json: Added matching translation keys for all TS error patterns
• bin/index.js: Added .ts file extension detection with runner resolution ( s-node → sx → sc fallback)
• test/test-ts.js: 14-test suite covering all TS error patterns — 14/14 passing

Notes

• All match fields use plain substrings (not regex), consistent with how matcher.js works (lowerInput.includes(matchPhrase))
• Existing JS/Python/Go/Rust/Java/C/C++ patterns are unaffected
• TypeScript errors in errlens analyze now produce human-readable explanations, causes, and fix suggestions

Summary by CodeRabbit

• New Features

  • Added support for running TypeScript and JavaScript files through the errlens run command.
  • Added guidance when no supported TypeScript runner is installed.
  • Expanded TypeScript error detection and explanations across common compiler diagnostics.
  • Added English localization for TypeScript error messages.

• Tests

  • Added coverage for matching representative TypeScript compiler errors.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d8d42bca-eb89-4635-8968-92fd04c61b45

📥 Commits

Reviewing files that changed from the base of the PR and between 5ebb77a and fc2a5ba.

📒 Files selected for processing (4)

• bin/index.js
• lib/database.json
• locales/en.json
• test/test-ts.js

🚧 Files skipped from review as they are similar to previous changes (4)

• test/test-ts.js
• bin/index.js
• lib/database.json
• locales/en.json

---

📝 Walkthrough

Walkthrough

The CLI now runs .ts and .mts files through tsx or ts-node. The diagnostic database and English locale now include TypeScript compiler errors. A test script validates 14 TypeScript diagnostic matches.

Changes

TypeScript support

Layer / File(s)	Summary
TypeScript runner selection and execution bin/index.js	The run command detects TypeScript files, selects tsx or ts-node, provides installation guidance when neither exists, and preserves direct Node execution for JavaScript files.
TypeScript diagnostic catalog and localization lib/database.json, locales/en.json	The diagnostic database and English locale now cover TypeScript type, module, syntax, control-flow, iterator, configuration, argument, overload, and global-type errors.
TypeScript diagnostic matching tests test/test-ts.js	The test script checks 14 representative compiler messages and exits with status 1 when any expected match fails.

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

Possibly related issues

• Add TypeScript support and TS-specific patterns #84 — This PR implements TypeScript execution support, diagnostic patterns, localization, and tests requested by the issue.

Suggested reviewers: jaseel0

🚥 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
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the primary change: adding TypeScript error pattern support, and it references the related issue.
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 unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 4

🤖 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.

Inline comments:
In `@bin/index.js`:
- Around line 112-116: Update the child-process launch around isTsFile,
resolveTsRunner, and execArgs so TypeScript files invoke the resolved runner
executable directly (or via npx --no-install) with filePath, while JavaScript
files continue using process.execPath. Adjust the command and arguments
consistently for both branches.

In `@lib/database.json`:
- Around line 520-525: Differentiate the TS2305 and TS2694 diagnostics by
assigning each a unique match phrase so matching by name cannot merge their
guidance: update lib/database.json lines 520-525 for TS2694 and lines 456-461
for TS2305. Replace the corresponding generic and duplicate localization keys in
locales/en.json lines 214-218 and 249-253 with keys for those unique phrases.
Update test/test-ts.js lines 7-14 to assert one result and the expected
diagnostic name for both cases.
- Around line 584-589: Update the database entry for “Cannot find global type”
from TS2309 to TS2318, preserving its existing match, explanation, fixes, and
example. Locate the related diagnostic-code test and replace its expected TS2309
value with TS2318.
- Around line 512-517: Update the TS2488 diagnostic configuration in
lib/database.json (lines 512-517) so match includes the emitted
“[Symbol.iterator]()” token; rename the corresponding localization keys in
locales/en.json (lines 244-248) to the corrected phrase, and update the TS2488
assertion in test/test-ts.js (line 13) to verify that token is present.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e17b071e-90f1-4e6e-b891-a24dd855822e

📥 Commits

Reviewing files that changed from the base of the PR and between 20b801f and 5ebb77a.

📒 Files selected for processing (4)

• bin/index.js
• lib/database.json
• locales/en.json
• test/test-ts.js

[naheel0]

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