ADR 035 — SWC parser vs alternatives (evaluation only)

ADR 035 — SWC parser vs alternatives (evaluation only)

Context

• vox-cli / vox-drift-check use swc_ecma_parser / swc_ecma_ast / swc_common for JS/TS structural validation.
• Alternative parsers (oxc, biome_js_parser, future tsgo) may offer speed or simpler deps but imply different AST shapes, error semantics, and MSRV/feature tradeoffs.

Decision

• Status quo: SWC remains the supported JS parse surface until this ADR is moved to Accepted with:
  • Benchmarks on representative corpora (cold cache, incremental).
  • Parity matrix for diagnostics consumers rely on today.
  • MSRV and workspace-hack impact notes.

Non-goals

• Drive-by parser swaps in dependency-cleanup PRs.

Status

Proposed — evaluation-only; link future spike PRs here.