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Changelog

All notable changes to Lineup are documented here.

[1.1.0] — 2026-04-30

Added

TypeScript support

  • Lineup can now scan TypeScript projects (.ts and .tsx files) for V8 JIT memory layout inefficiencies. V8 stores number properties as unboxed 8-byte doubles while all other property types are stored as 4-byte tagged compressed pointers (Node.js 14+, 64-bit). Interleaving number and non-number properties creates the same hidden padding waste as Go struct misalignment.
  • Analyzes three TypeScript constructs: class declarations (instance properties only; static properties are skipped), interface declarations, and object type aliases (type Foo = { ... }).
  • Supports both exported and non-exported declarations, including export default class.
  • New ts_parser.rs Rust module: walks .ts/.tsx files using oxc_parser 0.128 (pure Rust, no C build step). Auto-skips node_modules/, dist/, build/, .next/, .nuxt/, coverage/, and .cache/ in addition to .gitignore exclusions.
  • New TypeScript analysis pipeline in analyzer.rs: ts_type_info() V8 size model, analyze_ts_files(), and build_ts_def(). Shares the same align_up, struct_layout, and optimal-sort primitives as the Go pipeline.
  • TypeScript declarations that extend or implement other types are flagged ~approximate because parent properties affect V8 hidden-class layout but are not resolved across files.

Language selector

  • New Language toggle (Go / TypeScript) in the Scan Options modal. Arch selector is hidden when TypeScript is selected (V8 always uses 64-bit pointer compression).
  • New Default Language setting in the Settings page (go by default).
  • ScanOptions now carries a language field passed to the Tauri scan_repo command.

Declaration kind

  • declaration_kind field added to all result types: "struct" for Go, "class" / "interface" / "type" for TypeScript.
  • Kind badge shown next to the type name in StructCard and StructDetail for non-Go results.
  • Toolbar on the Scan Results screen shows "declarations" instead of "structs" for TypeScript scans.

Changed

  • Database schema — two additive ALTER TABLE migrations applied at startup:
    • scans.language TEXT NOT NULL DEFAULT 'go'
    • struct_results.declaration_kind TEXT NOT NULL DEFAULT 'struct'
    • Both migrations are no-ops on existing databases (duplicate-column errors are silently ignored).
  • save_scan and save_struct_result in db.rs now accept and store language / declaration_kind respectively.
  • get_history, get_scan_detail, and get_struct_detail queries updated to select and map the new columns.
  • ScanSummary, StructSummary, and StructDetail Rust and TypeScript types updated with new fields.
  • AppSettings TypeScript interface gains defaultLanguage: string.
  • Re-scan pre-fills the language of the original scan (same as it does for arch and ignore patterns).

Dependencies

  • Added oxc_allocator, oxc_parser, oxc_ast, oxc_span at version 0.128.0 (pure Rust TypeScript/JSX parser).

UI improvements

  • History card language badge — the language is now displayed as a bordered monospace pill (GO / TS) next to the repo path instead of inline parenthetical text. The path remains truncatable while the badge is always fully visible.
  • Language-aware ignore pattern placeholders — the ignore patterns textarea in the Scan Options modal and in Settings now shows language-appropriate placeholder examples. Go shows vendor/, generated/, _test\.go$; TypeScript shows \.test\.tsx?$, \.spec\.tsx?$, \.d\.ts$. The modal placeholder updates reactively when the language toggle is switched.

Internal

  • PARSER_LANGUAGE type narrowed to "GO" | "TS" — language values are now uppercase string literals throughout the frontend (types.ts, util.ts, settings store, all components and pages) and stored as "GO" / "TS" in the SQLite database. The database DEFAULT and Rust fallback values updated to match.
  • GitHub Actions CI pipeline (.github/workflows/ci.yml) — two jobs running on ubuntu-24.04:
    • Frontend: pnpm install (frozen lockfile) → Biome lint → tsc --noEmit type-check → Vite build. Uses actions/setup-node pnpm store cache.
    • Backend: apt system-dep cache → Tauri Linux deps → cargo check → cargo clippy → cargo test. Uses Swatinem/rust-cache with cache-on-failure and a shared cache key across branches.
    • All action references pinned to full commit SHAs. Triggers on push to main and develop, and on PRs targeting main.

[1.0.0] — initial release

  • Go struct padding analysis for amd64 and arm64 targets.
  • Three-pane results UI (file tree / declaration list / detail panel).
  • Scan history persisted to local SQLite database.
  • Re-scan with pre-filled options.
  • Configurable ignore patterns (regex).
  • Copy optimized definition to clipboard.
  • Dark / light theme.