🤖 Disclaimer: I had Claude help me write this issue.

feat(sh): ✨ support zsh dialect by upgrading sh-syntax to 0.6.0

🐛 Problem

• prettier-plugin-sh cannot format valid zsh scripts.
• Zsh parameter modifier chains such as ${0:A:h:h} are rejected with ternary operator missing ? before :.
• Root cause is upstream: sh-syntax bundled a mvdan/sh build with no zsh LangVariant.

🔁 Reproduction

• Format a file containing a zsh modifier chain:

  DIR=${0:A:h:h}

• Result with the current pinned sh-syntax (0.5.8):
  • Throws ternary operator missing ? before :
  • LangVariant.LangZsh is undefined (no zsh variant exists)

📦 Upstream fix (already merged/available)

• Issue: [bug] 🐛 valid zsh errors with ternary operator missing ? before : — vendored mvdan/sh version has no zsh dialect sh-syntax#135
• Fix PR: feat: ✨ add zsh dialect support (rebuild wasm against mvdan/sh v3.13.1) sh-syntax#136
• Released in [email protected] (https://www.npmjs.com/package/sh-syntax/v/0.6.0), which:
  • Rebuilds main.wasm against mvdan/sh v3.13.1 (was v3.11.0)
  • Exposes a new LangZsh variant
  • Breaking: LangVariant is now a bit-flag enum (1 << iota), so numeric values changed:
    • LangBash: 0 → 1
    • LangPOSIX: 1 → 2
    • LangMirBSDKorn: 2 → 4
    • LangBats: 3 → 8
    • LangZsh: (new) → 16
    • LangAuto: 4 → 32

🛠️ Proposed changes in prettier-plugin-sh

• Bump dependency: packages/sh/package.json → "sh-syntax": "^0.6.0"
• Expose the variant: add LangVariant.LangZsh to the variant option choices in packages/sh/src/index.ts
  • Without this, Prettier rejects variant: 16 with Invalid variant value. Expected 1, 2, 4, 8 or 32, but received 16.
• Update tests for the new upstream error wording (mvdan/sh v3.13 now backtick-quotes tokens):
  • test/error.spec.ts: encountered ) → encountered `)`
  • test/__snapshots__/fixtures.spec.ts.snap (445.sh): closing quote ' → closing quote `'`

✅ Verification

• After applying all three changes locally against [email protected]:
  • ${0:A:h:h} formats correctly with variant: LangVariant.LangZsh
  • foo(){ echo ${1:t}; } → foo() { echo ${1:t}; } (modifier chains preserved)
  • Full suite green: lint:es ✅, lint:tsc ✅, vitest run ✅ (83/83)

⚠️ Note on installing sh-syntax@^0.6.0

• Yarn 4's default npmMinimalAgeGate (1d) reports newly published versions as quarantined for the first 24h after publish.
• [email protected] was published 2026-07-08T05:08:33Z, so a fresh install only resolves cleanly after 2026-07-09T05:08:33Z.
• Not a blocker for the change itself — just relevant for anyone testing immediately after release.

🙋 Willing to contribute

• I will open a PR with all three changes (dependency bump + LangZsh choice + test updates) once Yarn's 1-day age-gate moratorium on [email protected] lifts (after 2026-07-09T05:08:33Z), so CI can resolve the dependency cleanly.