[snekxs]

Related to #777.

Problem

With Bridge as the active navigator.hid, clicking Add mouse on a setup where nothing matches the HID filters ended silently: the status text flashed back with only the button click sound audible. Root cause: the Bridge shim has no picker to cancel, so an empty requestDevice() result always means "nothing matched" — but requestSupportedClient() treated it as a user cancellation and returned null (native WebHID rejects on picker cancel, so that path is Bridge-only).

This hid real situations like a present-but-unsupported receiver (e.g. the reporter's G-Wolves Fenrir Pro, whose xvi-new protocol has no driver yet).

Change

• src/bridge-hid.ts: new bridgeEmptyResultMessage() — distinguishes "Bridge sees no mice from supported vendors" from "Bridge sees N device(s) but none matches a filter", including VID/PID details.
• src/device/controller.ts: empty result while Bridge is active now throws that message, landing in the persistent Connection-failed status + error toast. Native-picker behavior unchanged.

Verification

• npx tsc --noEmit clean, npm test 382/382 pass (2 new tests), npm run build succeeds. No styling or i18n changes (message is dynamic English, like the existing unsupported-device path).

Summary by CodeRabbit

• Bug Fixes
  • Improved feedback when Bridge HID cannot find a compatible mouse. Messages distinguish between no supported-vendor mouse being detected and visible devices lacking a supported control interface. When devices are visible, the message includes their names and VID details to help diagnose compatibility. Native WebHID behavior remains unchanged, and empty native device-picker results continue to return without an error.

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• src/device/controller.ts

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🚧 Files skipped from review as they are similar to previous changes (1)

• src/device/controller.ts

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📝 Walkthrough

Walkthrough

When Bridge HID is active and device selection returns no devices, the controller enumerates authorized devices and throws a Bridge-specific message. Native WebHID retains its null result.

Changes

Bridge HID empty results

Layer / File(s)	Summary
Format and test empty-result messages src/bridge-hid.ts, src/bridge-hid.test.ts	bridgeEmptyResultMessage distinguishes between no visible devices and visible devices without a supported control interface. Tests check both messages.
Handle empty device results in the controller src/device/controller.ts	When Bridge HID is active and device selection returns no devices, the controller enumerates authorized devices and throws the helper’s message. Native WebHID still returns null.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

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Merge Risk: ⚪ Minimal · up to d2bd2

Bridge enumeration failures reach the connection-failed status and toast rather than being reported as an empty device result. No merge-blocking issue is established.

Architecture Summary

Architecture risk: 🟡 Medium · up to 8f469

The change affects 1 system.

Changed systems: src

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — src (service) was modified; 3 changed files map to changed impact.

Before / after behavior

• observed — Modified behavior in src/bridge-hid.test.ts: The test import now includes bridgeEmptyResultMessage.
• observed — Modified behavior in src/bridge-hid.test.ts: Adds tests for bridgeEmptyResultMessage: an empty list is expected to mention missing supported-vendor mice and suggest adding a mouse; a list containing MOUSE is expected to report no matching supported control interface and include the product name and VID/PID.
• observed — Modified behavior in src/bridge-hid.ts: Added the exported bridgeEmptyResultMessage helper. It returns a no-supported-vendor-devices message when the input list is empty; otherwise, it includes the device count and describeHidDevice details and reports that no supported control interface matched.
• observed — Modified behavior in src/device/controller.ts: Imports bridgeEmptyResultMessage and isBridgeHidActive for Bridge-specific handling of empty device results.

Reliability and maintainability

• inferred — Risk-relevant change factors for src: blast_radius_1; direct_dependents_1

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Pre-merge checks | 4 | 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: reporting empty Bridge device enumeration results instead of silently treating them as cancellation.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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Inline comments:
Review comments at @src/device/controller.ts:
- Line 3565: Update the Bridge HID enumeration around navigator.hid.getDevices()
to propagate enumeration failures instead of converting them to an empty device
list. Preserve the existing connection-failed handling for the original error.

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📒 Files selected for processing (3)

• src/bridge-hid.test.ts
• src/bridge-hid.ts
• src/device/controller.ts

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