Problem

The Open in StackBlitz flow dies on pnpm install:

ERR_PNPM_UNSUPPORTED_ENGINE  Unsupported environment (bad pnpm and/or Node.js version)
Expected version: >=10.0.0
Got: 8.15.6

StackBlitz WebContainers ship a pinned pnpm 8.15.6, which:

• fails the repo's engines.pnpm: ">=10.0.0" gate under engine-strict=true (.npmrc), and
• cannot read pnpm-lock.yaml (lockfileVersion 9.0, which needs pnpm 9+/10).

Relaxing the engine check is the wrong fix — pnpm 8 still can't parse the v9 lockfile. StackBlitz genuinely needs pnpm 10. The error only flags pnpm (not Node), so the WebContainer's Node already satisfies >=22.

Fix

Prepend npm i -g pnpm@10.33.0 (matching the packageManager field) to .stackblitzrc's startCommand, so the WebContainer installs a compatible pnpm before install/dev. Also upgrades the global pnpm, so a manual pnpm install && pnpm dev in the StackBlitz terminal works too.

- "startCommand": "pnpm install && pnpm dev",
+ "startCommand": "npm i -g pnpm@10.33.0 && pnpm install && pnpm dev",

Keeps engine-strict and the Node 22 / pnpm 10 requirements intact for real dev + CI. Config-only — does not touch the publishable dist/objectstack.json.

Verification

• pnpm verify green locally (validate ✓, typecheck ✓, build ✓, test 17/17 ✓).
• v9 lockfile resolves cleanly under pnpm 10.33.0 (Lockfile is up to date).
• .stackblitzrc is valid JSON.

Maintenance note: the pinned version is coupled to packageManager — bump both together on a future pnpm upgrade.

🤖 Generated with Claude Code