Visual Studio 2015 Out of Memory Crash (reproducible)

[TeamworkGuy2]

TypeScript Version: 2.3.3 (VS plugin)
Environment: Visual Studio 2015 update 3, Windows 7
Project Type: tsconfig.json (relevant part...)

  "compilerOptions": {
    "lib": [ "es2017", "dom", "dom.iterable", "webworker" ],
    "module": "commonjs",
    "moduleResolution": "node",
    "skipDefaultLibCheck": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ]
  },
  // ...

Project Info TFS for SCM, mixed code project (TS and C#)

tsc --diagnostics -w:
171k lines, 580 files, ~800 MB mem used, ~8 sec Check time

Visual Studio runs out of memory and crashes frequently. The behavior varies and falls into one of these cases:

• VS2015 closes without warning and a small popup with the message 'Hard Error' and an OK button is displayed
• VS2015 freezes and '(not responding)' is appended to the title bar, clicking on the window or trying to close it causes the standard Windows error report popup to be displayed
• VS2015 displays a 'Visual Studio has suspended some advanced features to improve performance.' message along the top of text editor window and VS crashes 3-10 mins later

The issue has grown worse over the last ~6 months as our team has progressively upgraded from TypeScript 2.0 - 2.3 and as our codebase has grown. This week VS2015 has been crashes every 45 - 60 mins while editing TS files. I've been monitoring devenv.exe via Task Manager and the crashes always occur when it reaches ~3.2 GBs of memory usage.

These crashes can be reproduced my me and a coworker with the proprietary codebase we work on (I also work on several small open source TypeScript projects and have not had VS2015 issues with those). I don't think I can condense the issue down to a non-proprietary repo that I'd be allowed to share with you guys so I'd love some guidance on debugging this from my end.

I have logs from running VS with logging enabled via devenv.exe /log path and would be happy to provide those logs if requested.

I attempted to follow the Dev Mode in Visual Studio wiki article several weeks ago, but couldn't get it working and found issue #14928 which indicates that dev mode no longer works.

Also tried VS Code a few weeks ago and tsserver does not have the same memory issue as VS2015, but VS Code doesn't have all the features I've grown to love in VS2015 so I'd like to stick with VS2015 and get this issue figure out.

I looked around this repository and couldn't find anything that looked like the code for the VS plugin. I'd love if we could revisit this thought #2656 (comment).

I'm ready to devote my own time to resolving this issue as it's seriously affecting my productivity! Any suggestions on what I can do for you guys to help track down this issue?

[billti]

I don't suppose you have a machine with either a) VS 2017 or b) TypeScript 2.4 (or preferably a VS 2017 machine with TS 2.4) to see if this issue still occurs? One of the most useful pieces of info before we investigate further is to know if we've already fixed it ;-)

[TeamworkGuy2]

I'll see what I can do, I'm not sure if the project will run in VS 2017 community edition (we only have enterprise licenses for VS 2015), but I'll give it a try and report back.

[TeamworkGuy2]

@billti & @bowdenk7
VS 2017 is installed - Version 15.2 (26530.16)
I installed TypeScript 2.4.1 from the plugin download page and confirmed that 2.4 was selected in Tools > Options > Text Editor > JavaScript/TypeScript > Intellisense; I noticed TypeScript version is showing as 2.2.2.0 in the Help > About window.
I wrote a String enum in one of the TS files and it compiled, so I'm guessing it's using 2.4 correctly.

The issue, I don't have type autocomplete intellisense in TS files! (working correctly in C# files)
After I finish typing something, the error checker works correctly and shows relevant errors, but no sign of autocomplete anywhere types are expected (parameters, function return, class members, local variables, etc.), not even for basic types like 'string'. Although module/class level autocomplete for words like 'function' and 'interface' is working. Any ideas, should I open a separate issue?

[billti]

Is this with the same project? Are you only seeing intellisense issues with the same problematic project? i.e. if you create a new empty ASP.NET app and add a TypeScript file, do you get intellisense working fine there?

[TeamworkGuy2]

Both the existing problematic project and a brand new ASP.NET project with a new TS file are having the auto completion issue.

[billti]

The fact the error list is updating as you type (I assume you don't need to build to see the errors) indicates the language service is working. The fact you get intellisense in other languages and also it is appearing for keywords shows the completion list is functioning. So this is bizarre.

I wonder if it may be the command-handler not responding as you type certain keys. If in a TypeScript file you type "document." do you not see the completion list after the dot with "addEventListener" etc.? If not, with the cursor positioned after the dot, if you select from the menu "Edit / Intellisense / List members" does anything appear?

[TeamworkGuy2]

If I type 'document' (I also tested with several other global objects as well as some custom objects imported via 'import ...' statements) I do see a full list of members (including fields, methods, interfaces, everything).

It's specifically type completion that's not working. After typing the colon ':' after a parameter, closing method parenthesis, field name, or local variable name I don't get anything.