[ts] Cannot find module '@angular/core'

[lizhuangs]

• VSCode Version: Code - Insiders 1.17.0-insider (f7962f0, 2017-09-20T05:24:33.599Z)
• OS Version: Windows_NT x64 10.0.15063
• Extensions:

Extension	Author (truncated)	Version
project-manager	ale	0.21.1
path-intellisense	chr	1.4.2
githistory	don	0.2.3
EditorConfig	Edi	0.10.1
tslint	eg2	1.0.7
auto-close-tag	for	0.5.0
auto-rename-tag	for	0.0.14
beautify	Hoo	1.1.1
Angular2	joh	2.7.0
vscode-JS-CSS-HTML-formatter	lon	0.2.3
Angular-BeastCode	Mik	4.4.1
debugger-for-chrome	msj	3.3.0
seti-icons	qin	0.1.3
vscode-icons	rob	7.13.0
code-settings-sync	Sha	2.8.3

when I upgrade the lastest vscode 1.17.0 insiders,
I got the error :[ts] Cannot find module '@angular/core',even though my app can also run.
now I uninstall the 1.17.0 insiders and install 1.16.1 stable version.It works well.
hope for testing well when release new version next time.
Tks.I really like it~

[Frikki]

I can verify this issue.

[Abdullah-AlAttar]

I'm having the same issue just after the latest update

[mjbvz]

Can you please try installing [email protected] in your workspace and rebuilding your project with that. I'd like to understand if the TypeScript update may have regressed this

[Frikki]

@mjbvz, that didn’t help for me. In fact, packages cannot be built using [email protected].

[mjbvz]

@Frikki I'm just trying to track down the root cause right now. What I want to understand is if you are seeing compile errors with the latest insiders build of TypeScript (2.5.3-insiders.20170919) vs with TypeScript 2.5.2 that we included in VSCode 1.16

Independent of VSCode, do you see new compile errors when running tsc from [email protected] vs tsc from [email protected]?

[NickClark]

Same issue here. I found that by setting VSCode to use my workspace version (2.5.2), the problem went away.

[mjbvz]

Hey @mhegazy / @RyanCavanaugh, should we move this over to the TS repo? The issue sounds similar to microsoft/TypeScript#18630

[Frikki]

@mjbvz

Independent of VSCode, do you see new compile errors when running tsc from [email protected] vs tsc from [email protected]?

Yes, I see compilation errors when running tsc using [email protected], but not with [email protected]. Both display errors in VSCode version 1.17.0-insider, however.

[Frikki]

Workaround

1. Open a TypeScript file.
2. Click the TypeScript version to the bottom right in the Status Bar.
3. Choose Use Workspace Version from the message box.

[mjbvz]

Thank, yes switching the workspace to use a stable TS version like 2.5.2 is the proper workaround

@mhegazy / @RyanCavanaugh It sounds like users are seeing this on the 2.5.3 insiders but not on 2.5.2. Does that still sound consistent with microsoft/TypeScript#18630 which seems to track a regression that first appeared in TS 2.5?

[ghost]

This is working on me with typescript@next on the command line (except that @angular/core has some compiler diagnostics relating to microsoft/TypeScript#15104) and in vscode with typescript.tsdk set. It doesn't work without typescript.tsdk, because then vscode uses TypeScript 2.5.3-insiders.20170919, and thus doesn't include microsoft/TypeScript#18651 which was merged less than a day ago.
I've also tested that this works against a local build of the release-2.5 branch of TypeScript.

[mjbvz]

Thanks @andy-ms!

Closing as upstream. This should be fixed when we pick up the next TS insiders drop

[smlombardi]

I can't seem to switch versions of Typescript:

Note: we have TS 2.5.2 installed, but inside of /client

[ghost]

@smlombardi Use npm install -g typescript@next, then set up vscode to use it.

[ayyash]

When is this going to be fixed? I am stuck with insiders and have no work around, is this going to be fixed soon? Or should I install VSCode for now?

[ghost]

@ayyash Same advice I gave to @smlombardi -- install typescript@next and get vscode to use that instead of a bundled version

[krzkaczor]

WORKAROUND FOR DESPERATE ONES

I think I have tried everything that was mentioned across many different issues: reloading projects, using different versions of typescript, playing with type related settings in tsconfig. Nothing seems to work.

Finally, I decided to copy (only for dev since compilation with tsc works without any problems) whole module (it had typings build in) to @types:

cp -r ./node_modules/routing-controllers ./node_modules/@types/routing-controllers

and it works 🎉

[smlombardi]

FWIW, the advice from @andy-ms worked fine for me. I installed TS 2.5.2 globally, and added
"typescript.tsdk": "/usr/local/lib/node_modules/typescript/lib", to my user settings.

[krzkaczor]

Finally I nailed it down: i was missing "module": "commonjs", setting in package.json. Then suddenly visual studio code started resolving all modules :O really bizarre. I will create a proper bug report if I can reproduce this problem.

[ghost]

@krzkaczor Without that setting, TypeScript will use a different method to attempt to resolve modules, that doesn't look in node_modules (except for @types packages).

[krzkaczor]

@andy-ms Yeah you're totally right.

I think I went "full retard" on this one — I was using all the time some weird mix of ts-node with different tools which were happily compiling my project even though running tsc would return errors.