feat: GSTIN validation, SAC codes, export utilities, CLI, and advanced HSN lookups (Issue #4)#6
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…CLI, advanced lookups - Add gstin.js: validateGSTIN, formatGSTIN, getStateFromGSTIN, isValidPAN, getGSTINComponents - Add sac.js + data/sac_codes.json: 490+ real SAC codes with getAllSac, getSacByCode, searchSac, getCodeDetails - Add export.js: exportToCSV, exportToJSON, generateGSTR1Summary - Add advanced HSN: getChapterSummary, findCodesByDescription, bulkValidateHsnCodes - Add bin/cli.js: CLI with search, validate, chapter, stats, gstin, sac, export commands - Add 4 new test files (gstin, sac, export, advanced) - Update TypeScript definitions and README docs - Bump version to 2.2.0 Closes #4 https://claude.ai/code/session_01V2bGsWhrzxeEpoV8BJyZMi
…te job - Add data/gst_rates.json with IGST/CGST/SGST/cess per HSN code (12,604 entries) based on CBIC Notification No. 09/2025-CT(Rate), effective 22 Sep 2025 - Add scripts/update-gst-rates.js: download-or-fallback pipeline for rate data - Add .github/workflows/update-gst-rates.yml: weekly Monday cron + manual dispatch with auto-issue on failure - Add getGstRateByCode(), getHsnByExactCodeWithRate(), getHsnByRateSlabs() - Add TypeScript types: GstRate, HsnCodeWithRate - Add tests/gst-rates.test.js - Bump version to 2.3.0 Closes #2 https://claude.ai/code/session_01V2bGsWhrzxeEpoV8BJyZMi
Merged gst.js calculation utilities (from dev/PR #5) with all PR #6 features: GSTIN validation, SAC codes, export utils, CLI, advanced HSN lookups, and GST rate data. All 105 tests passing. https://claude.ai/code/session_01V2bGsWhrzxeEpoV8BJyZMi
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Summary
Implements all feasible features from Issue #4, bumping the package to v2.2.0. All 77 tests pass.
1. GSTIN & PAN validation (
gstin.js)validateGSTIN— structural + MOD-36 checksum validation, returns state code/name, PAN, entity number, check digitisValidPAN,formatGSTIN,getStateFromGSTIN,getGSTINComponents2. SAC codes (
sac.js+data/sac_codes.json)getAllSac,getSacByCode,searchSac(matchType + pagination),getCodeDetails(HSN/SAC unified lookup, no circular dependency)3. Export utilities (
export.js)exportToCSV(delimiter/headers, RFC-style escaping),exportToJSON,generateGSTR1Summary(rate-wise CGST/SGST/IGST/cess breakdown)4. Advanced HSN lookups (
index.js)getChapterSummary,findCodesByDescription(AND keyword match),bulkValidateHsnCodes5. CLI (
bin/cli.js)hsn search | validate | chapter | stats | gstin | sac | export | help— installed as thehsnbinAlso
gstin,sac,export,advanced(77 tests total, all passing)package.jsonv2.2.0 +bin+files;data/metadata.jsonupdatedTest plan
npm test— 77/77 passinggstin,validate,sac)27AAPFU0939F1ZV→VCloses #4
https://claude.ai/code/session_01V2bGsWhrzxeEpoV8BJyZMi
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