Files
ComfyUI_frontend/apps/desktop-ui
Christian Byrne 341fef46a9 refactor: replace unsafe as Error assertions with type guards (#11845)
## Summary

Replaces all 7 production `as Error` type assertions with proper
`instanceof Error` narrowing or a new `toError()` helper, and adds an
ESLint rule to prevent new ones. First slice of #11429 (the `as Error`
category — 9 total occurrences, 7 production + 2 in a test file left
untouched).

## Changes

- **What**:
- New `src/utils/errorUtil.ts` exporting `toError(value: unknown):
Error` and `getErrorMessage(value: unknown): string | undefined`.
`toError` returns the value unchanged if already an `Error`, otherwise
wraps it (handles strings, `undefined`, JSON-serializable objects, and
circular refs via `String()` fallback).
  - Refactored 7 production call sites:
- `src/services/gateway/registrySearchGateway.ts` — `toError(error)` for
`lastError` assignment in fallback loop
- `src/platform/cloud/onboarding/auth.ts` (×2) — `toError(error)` for
`captureApiError` Sentry calls
-
`src/renderer/extensions/vueNodes/widgets/composables/audio/useAudioRecorder.ts`
— `toError(err)` before forwarding to `options.onError`
- `src/extensions/core/load3d/LoaderManager.ts` — replaced `error as
Error & { response?: ... }` cast inside `isNotFoundError` with
`'response' in error` + nested narrowing
- `apps/desktop-ui/src/stores/maintenanceTaskStore.ts` — inline `error
instanceof Error ? error.message : String(error)`
- `apps/desktop-ui/src/components/maintenance/TaskListPanel.vue` —
inline `error instanceof Error ? error.message : undefined`
- New ESLint rule (`no-restricted-syntax` block named
`comfy/no-unsafe-error-assertion`) banning `TSAsExpression
TSTypeReference[typeName.name='Error']` in `src/**` and `apps/*/src/**`,
with test files (`*.test.ts`, `*.spec.ts`) excluded.
  - 12 unit tests for the new helpers in `src/utils/errorUtil.test.ts`.
- **Breaking**: none
- **Dependencies**: none

## Review Focus

- The lint rule is scoped to non-test source files. Test files retain
freedom to use `as Error` for fixture construction; only 2 occurrences
exist (in `teamWorkspaceStore.test.ts` and `errorDialog.spec.ts`) and
they're intentional.
- `toError` is duplicated as inline `instanceof` narrowing in
`apps/desktop-ui/` rather than imported, since the desktop-ui workspace
doesn't share `@/utils/` with the main app and adding a path mapping for
one helper felt heavier than two inline guards.
- Remaining `as`-on-DOM categories (HTMLElement ×133, HTMLInputElement
×55, HTMLCanvasElement ×36, KeyboardEvent ×7, Element ×3, MouseEvent ×2,
Event ×2) are intentionally left for follow-up PRs to keep this one
reviewable.

Refs #11429

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-11845-refactor-replace-unsafe-as-Error-assertions-with-type-guards-3546d73d36508137a015c4f9e8708f23)
by [Unito](https://www.unito.io)
2026-05-04 11:40:28 -07:00
..