VSCodeVim / VSCodeVim/Vim

Cannot read properties of undefined (reading 'lineAt')

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Dominant language
TypeScript
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Merged PRs (30d)
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Description

To Reproduce
Steps to reproduce the behavior:

  1. Go to '...'
  2. Click on '....'
  3. Scroll down to '....'
  4. See error

VSCodeVim version: 1.21.18

Stack trace 
TypeError: Cannot read properties of undefined (reading 'lineAt')
    at Ao.isLineEnd (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim.vim-1.30.1/out/extension.js:2:766614)
    at D.handleSelectionChange (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/src/mode/modeHandler.ts:265:55)
    at job (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/extensionBase.ts:335:38)
    at o.start (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/node_modules/queue/index.js:145:17)
    at o.push (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/node_modules/queue/index.js:59:12)
    at Object.enqueueTask (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/src/taskQueue.ts:55:20)
    at listener (/home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/extensionBase.ts:335:17)
    at /home/jaycee/.var/app/com.visualstudio.code/data/vscode/extensions/vscodevim-sneak-fork.vscodevim-sneak-fork-1.21.18/extensionBase.ts:633:5
    at Gh.value (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:164:103706)
    at $.C (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2375)
    at $.D (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2445)
    at $.fire (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2662)
    at yq.$acceptEditorPropertiesChanged (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:164:71969)
    at a4.S (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:117864)
    at a4.Q (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:117644)
    at a4.M (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:116733)
    at a4.L (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:115838)
    at Gh.value (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:114635)
    at $.C (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2375)
    at $.fire (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2593)
    at ao.fire (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:9459)
    at Gh.value (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:356:8152)
    at $.C (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2375)
    at $.fire (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:27:2593)
    at ao.fire (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:29:9459)
    at MessagePortMain.<anonymous> (file:///app/extra/vscode/resources/app/out/vs/workbench/api/node/extensionHostProcess.js:356:6444)
    at MessagePortMain.emit (node:events:518:28)
    at MessagePortMain.emit (node:domain:489:12)
    at Object.MessagePortMain._internalPort.emit (node:electron/js2c/utility_init:2:3073)
    at Object.topLevelDomainCallback (node:domain:161:15)
    at Object.callbackTrampoline (node:internal/async_hooks:128:24)

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First steps

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Research direction

The report provides placeholder reproduction steps; start at handleSelectionChange in src/mode/modeHandler.ts around line 265 and trace the selection-change listener in extensionBase.ts around line 335. Compare this path with isLineEnd in the reported extension.js stack frame. Done means reproducing the scenario without the undefined lineAt error and verifying selection changes remain functional.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript, vscode
Domain
developer-experience, tooling
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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