cannot find module 'angular2/core'

Question

These red squiggly lines say cannot find module 'angular2/core',cannot find module 'angular2/router',cannot find module 'angular2/http'. I checked other posts in SO but it seems they have no appropriate answer.

I also added a reference to the d.ts files as seen below but still not working.

Other posts say that I need to configure something in the tsconfig.json file but I am using Visual Studio and I see no need to use the tscompiler suggested by the angular team because Visual Studio should be able to compile ts files automatically.

Am I missing something?

Is the tsconfig.json still required even if you use Visual Studio?

How do I get rid of these squiggly lines?

Thanks!

(I am using Visual Studio 2015 and latest Typescript engine)

UPDATE: I am not sure what exactly is the npm package manager. But I have a pre-built package.json file that was created when the project was created. I use this file for installing npm packages.

Answer 1

1. In Visual Studio 2015, go to "Tools" menu and click on "Options...". You will be able to see a tree structure on the left side of the opened window.
2. Expand "Projects and Solutions" and then select "External Web Tools". Now move "$(PATH)" entry above the "$(DevEnvDir)" entry.
3. Click OK. Restart the Visual Studio.
4. Now right click on the "package.json" file in the solution explorer and click on "Restore Packages".

Answer 2

Just right click on "package.json"

and select "Restore Packages" after installation of Packages build it... your problem is solved

Answer 3

Easiest way to install it is with npm package manager, because angular2 is shipped with typing now. Your editor will recognize all import locations...

Answer 4

For ASP.NET 5.0 applications in VS 2015, configuring typescript is a bit challenging.

Until the tooling around typescript improves, you can configure typescript manually:

Step 1: Right-click project, and Unload Project 
Step 2: Right-click the unloaded project, and Edit the .xproj file
Step 3: Add a PropertyGroup node, under the Project node:

  <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
    <TypeScriptTarget>ES5</TypeScriptTarget>
    <TypeScriptJSXEmit>None</TypeScriptJSXEmit>
    <TypeScriptCompileOnSaveEnabled>True</TypeScriptCompileOnSaveEnabled>
    <TypeScriptNoImplicitAny>False</TypeScriptNoImplicitAny>
    <TypeScriptModuleKind>CommonJS</TypeScriptModuleKind>
    <TypeScriptRemoveComments>False</TypeScriptRemoveComments>
    <TypeScriptOutFile />
    <TypeScriptOutDir />
    <TypeScriptGeneratesDeclarations>False</TypeScriptGeneratesDeclarations>
    <TypeScriptNoEmitOnError>True</TypeScriptNoEmitOnError>
    <TypeScriptSourceMap>True</TypeScriptSourceMap>
    <TypeScriptMapRoot />
    <TypeScriptSourceRoot />
    <TypeScriptExperimentalDecorators>True</TypeScriptExperimentalDecorators>
  </PropertyGroup>

Step 4: Right-click the unloaded project and Reload Project
Step 5: Re-build project

If you are still encountering the error where it cannot find the module, exit visual studio and reload the solution.

Answer 5

This has to be done for both 'Debug' and 'Release' then only it works in VS 2013. Like below..

<PropertyGroup Condition="'$(Configuration)' == 'Release'">
    <TypeScriptTarget>ES5</TypeScriptTarget>
    <TypeScriptJSXEmit>None</TypeScriptJSXEmit>
    <TypeScriptCompileOnSaveEnabled>True</TypeScriptCompileOnSaveEnabled>
    <TypeScriptNoImplicitAny>False</TypeScriptNoImplicitAny>
    <TypeScriptModuleKind>system</TypeScriptModuleKind>
    <TypeScriptRemoveComments>False</TypeScriptRemoveComments>
    <TypeScriptOutFile />
    <TypeScriptModuleResolution>NodeJs</TypeScriptModuleResolution>
    <TypeScriptOutDir />
    <TypeScriptGeneratesDeclarations>False</TypeScriptGeneratesDeclarations>
    <TypeScriptNoEmitOnError>True</TypeScriptNoEmitOnError>
    <TypeScriptSourceMap>True</TypeScriptSourceMap>
    <TypeScriptMapRoot />
    <TypeScriptSourceRoot />
    <TypeScriptEmitDecoratorMetadata>True</TypeScriptEmitDecoratorMetadata>
    <TypeScriptExperimentalDecorators>True</TypeScriptExperimentalDecorators>
</PropertyGroup>

<PropertyGroup Condition="'$(Configuration)' == 'Debug'">
    <TypeScriptTarget>ES5</TypeScriptTarget>
    <TypeScriptJSXEmit>
    </TypeScriptJSXEmit>
    <TypeScriptCompileOnSaveEnabled>True</TypeScriptCompileOnSaveEnabled>
    <TypeScriptNoImplicitAny>False</TypeScriptNoImplicitAny>
    <TypeScriptModuleKind>system</TypeScriptModuleKind>
    <TypeScriptRemoveComments>False</TypeScriptRemoveComments>
    <TypeScriptOutFile />
    <TypeScriptModuleResolution>NodeJs</TypeScriptModuleResolution>
    <TypeScriptOutDir />
    <TypeScriptGeneratesDeclarations>False</TypeScriptGeneratesDeclarations>
    <TypeScriptNoEmitOnError>True</TypeScriptNoEmitOnError>
    <TypeScriptSourceMap>True</TypeScriptSourceMap>
    <TypeScriptMapRoot />
    <TypeScriptSourceRoot />
    <TypeScriptEmitDecoratorMetadata>True</TypeScriptEmitDecoratorMetadata>
    <TypeScriptExperimentalDecorators>True</TypeScriptExperimentalDecorators>
</PropertyGroup>

Answer 6

• Try to run npm install command (will install missing lib in your project)
• ReOpen your folder/project