Fix npm run check failing on a clean clone

[rafaelfiguereod-stack]

What

npm run check, the typecheck gate the README asks for before sending a PR, fails on a fresh clone of main. Three workspaces report the same error:

../assets/src/browser.ts(65,25): error TS2339: Property 'showSaveFilePicker'
does not exist on type 'Window & typeof globalThis'.

@diffusionstudio/encoder, @diffusionstudio/reconciler and @diffusionstudio/runtime fail. The other eight workspaces pass.

Why

packages/assets/src/browser.ts calls window.showSaveFilePicker, which is typed by @types/wicg-file-system-access. That package is declared only in apps/web, and pulled in there through types in tsconfig.app.json.

The three failing packages pin types in their own tsconfigs (["@webgpu/types"], plus @types/audioworklet for the encoder). Pinning types turns off automatic inclusion of every other @types package, so the global augmentation is not in their program when they typecheck the assets source they import.

packages/assets itself passes, but only by accident: it does not pin types, so it picks up the hoisted copy that the apps/web install put in the root node_modules.

The fix

Two lines plus a lockfile entry.

A triple-slash reference in the file that uses the API. types only governs automatic inclusion, so an explicit reference resolves regardless of what a consumer pins. This matches the existing style in apps/web/src/vite-env.d.ts.

The package declared in packages/assets, so the workspace that uses the API owns its type dependency instead of leaning on another workspace's install.

Adding the package alone does not fix it. I checked: with the dependency installed but the reference removed, the encoder still fails, because its types pin keeps the augmentation out either way.

Verified

On Windows, Node 24.1.0, npm 11.3.0, at b317412.

• npm run check: clean across all eleven workspaces, was three failures
• npm run lint: unchanged, 0 errors and the same 3 pre-existing warnings
• npm test: 131 passed across the three workspaces that have tests

One unrelated note in case it is useful: packages/agent-chat's "interrupts a running turn and records what was streamed" e2e test failed once under a full npm test run and then passed 3 of 3 on its own, so it looks timing sensitive under load rather than broken.

🤖 Generated with Claude Code

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