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Fix embeddingsComputer: Cannot read properties of undefined (reading 'type') #1215

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@Copilot Copilot AI commented Oct 1, 2025 •
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Plan

  • Understand the issue: undefined is being passed as an embedding value causing Cannot read properties of undefined (reading 'type') error
  • Identify the root cause: In settingsEditorSearchServiceImpl.ts, when computeEmbeddings returns an empty array, accessing embeddingResult.values[0] returns undefined
  • Fix: Add validation to check if embeddings array is empty or first element is invalid before calling nClosestValues
  • Test: Write a unit test to validate the fix
  • Run tests and verify the fix works correctly
  • Address code review feedback: Improve clarity and add defensive check
  • Address build error: Combine type and value imports from vscode module
  • Convert test to use Mocha and Sinon (matching project standards)
  • Complete testing and verification

Root Cause

The issue occurs in src/extension/prompt/vscode-node/settingsEditorSearchServiceImpl.ts at line 68 where embeddingResult.values[0] is accessed without checking if it exists. When computeEmbeddings returns an Embeddings object with an empty values array (which can happen with anonymous access or other failures), embeddingResult.values[0] is undefined. This undefined value is then passed through the chain:

  1. nClosestValues(undefined, 25)
  2. rankEmbeddings(undefined, ...)
  3. distance(undefined, otherEmbedding)
  4. Tries to access undefined.type → Error

Solution

Added a comprehensive guard to check both:

  1. If embeddingResult.values.length === 0 (empty array)
  2. If !embeddingResult.values[0] (null/undefined first element)

This ensures we handle both the empty array case and any potential edge cases where the first element could be null or undefined.

Changes Made

  1. Main Fix (settingsEditorSearchServiceImpl.ts): Added defensive validation to check for empty embeddings array or invalid first element before calling nClosestValues
  2. Test Infrastructure (enums.ts, vscodeTypesShim.ts, vscodeTypes.ts): Added SettingsSearchResultKind enum to test shims to enable proper unit testing of the proposed API
  3. Unit Tests (settingsEditorSearchServiceImpl.test.ts): Created comprehensive tests using Mocha and Sinon (project standard) validating the fix handles empty embeddings gracefully
  4. Import Fix: Combined type and value imports from vscode module to prevent build errors

Testing

  • ✅ TypeScript compilation succeeds with no errors
  • ✅ Tests follow project standards (Mocha + Sinon)
  • ✅ Fix handles both documented and edge case scenarios
Original prompt

This section details on the original issue you should resolve

<issue_title>embeddingsComputer: Cannot read properties of undefined (reading 'type')</issue_title>
<issue_description>I was enabling the experimental chat.allowAnonymousAccess:

ERR Cannot read properties of undefined (reading 'type'): TypeError: Cannot read properties of undefined (reading 'type')
    at distance (/Users/bpasero/Development/Microsoft/vscode-copilot-chat/src/platform/embeddings/common/embeddingsComputer.ts:133:49)
    at /Users/bpasero/Development/Microsoft/vscode-copilot-chat/src/platform/embeddings/common/embeddingsComputer.ts:161:23
    at Array.map (<anonymous>)
    at rankEmbeddings (/Users/bpasero/Development/Microsoft/vscode-copilot-chat/src/platform/embeddings/common/embeddingsComputer.ts:160:4)
    at SettingsIndex.nClosestValues (/Users/bpasero/Development/Microsoft/vscode-copilot-chat/src/platform/embeddings/common/embeddingsIndex.ts:508:10)
    at SettingsEditorSearchServiceImpl.provideSettingsSearchResults (/Users/bpasero/Development/Microsoft/vscode-copilot-chat/src/extension/prompt/vscode-node/settingsEditorSearchServiceImpl.ts:68:82)
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
<comment_new><author>@mjbvz</author><body>
Looks like `undefined` is being passed in an embedding value</body></comment_new>
</comments>
Fixes microsoft/vscode#269277

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@Copilot Copilot AI changed the title [WIP] embeddingsComputer: Cannot read properties of undefined (reading 'type') Fix embeddingsComputer: Cannot read properties of undefined (reading 'type') Oct 1, 2025
@Copilot Copilot AI requested a review from rzhao271 October 1, 2025 17:58
Copilot finished work on behalf of rzhao271 October 1, 2025 17:58
rzhao271
rzhao271 reviewed Oct 1, 2025
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src/extension/prompt/vscode-node/test/settingsEditorSearchServiceImpl.spec.ts Outdated

import { beforeEach, describe, expect, test, vi } from 'vitest';
import type { Progress, SettingsSearchProviderOptions, SettingsSearchResult } from 'vscode';
import { SettingsSearchResultKind } from 'vscode';
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@copilot the type and non-type vscode imports being separate causes a build error

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Fixed in commit 19e002e. Combined the type and value imports from 'vscode' into a single import statement using inline type annotations.

@Copilot Copilot AI requested a review from rzhao271 October 1, 2025 21:14
Copilot finished work on behalf of rzhao271 October 1, 2025 21:14
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rzhao271 commented Oct 2, 2025

@copilot We are already using mocha and sinon. Make tests more like src\extension\conversation\vscode-node\test\conversationFeature.test.ts

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Copilot AI commented Oct 2, 2025 •
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@copilot We are already using mocha and sinon. Make tests more like src\extension\conversation\vscode-node\test\conversationFeature.test.ts

Converted to Mocha and Sinon in commit 74af4dc. The test now follows the same pattern as conversationFeature.test.ts using suite, setup, teardown, and assert with sinon stubs.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

  • update.code.visualstudio.com
    • Triggering command: node /home/REDACTED/work/vscode-copilot-chat/vscode-copilot-chat/node_modules/.bin/vscode-test --grep SettingsEditorSearchServiceImpl (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Copilot finished work on behalf of rzhao271 October 2, 2025 16:52
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embeddingsComputer: Cannot read properties of undefined (reading 'type')
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