找不到 Typescript 编译器：命令“tsc”无效

Question

Just installed Typescript extension to VS2012 and followed Install TypeScript for Visual Studio 2012 and then the tutorial to call the compiler:

> tsc greeter.ts

But when i try to compile .ts file where should i type: tsc greeter.ts ? Tried it in VS command line and in windows console, always get the message that tsc is not recognized as command( Command "tsc" is not valid. ).

Answer 1

If you're using tsc as a node module, make sure you've installed it with

npm install -g typescript

Then it should be available globally in your node command prompt

Answer 2

Ensure you have,

C:\\Program Files (x86)\\Microsoft SDKs\\TypeScript\\0.8.0.0

or,

C:\\Program Files\\Microsoft SDKs\\TypeScript\\0.8.0.0

on your path. If not, try restarting CMD.EXE and see if shows up with a fresh copy. If that fails, try adding one of the above manually to your path.

Answer 3

For folks on Windows with Visual Studio Code , who don't want to install full Visual Studio just for tsc.exe , I can suggest to simply download it from here: https://www.microsoft.com/en-us/download/details.aspx?id=48593 .

This is a shame that this link is missing from the TypeScript download page.

Although the installer is called TypeScript for Visual Studio 2015 , it works with Visual Studio Code as well.

After you downloaded and installed TypeScript, you should manually add its installation directory ( C:\\Program Files (x86)\\Microsoft SDKs\\TypeScript\\2.0\\ in my case) to the %PATH% environment variable .

Open environment variables editor:

Win + S ; e , n , v , i , r , o ; click Edit environment variables for your account .

In the window opened find Path user variable (note that it is not named %PATH% here, but still this is it). You probably have some path set there already. You just have to type ; , append the TypeScript install location and add one more ; in the end.

Screenshot for your reference:

After this is done, open Command Prompt and type in tsc -v . If tsc.exe 's version is getting displayed, you're done. For this to work, restart Command Prompt and VS Code after making the change to the %PATH% .

PS If you get "error TS5057: Cannot find a tsconfig.json file at the specified directory: '.'", just create tsconfig.json file in the document root (that's probably where your .ts files are) with simple contents: {} . This means "an empty JSON file <...>. This will be sufficient for most people." ( source ).

Answer 4

通常关闭并重新打开命令提示符可以解决问题。

Answer 5

Check both of these folders to find out what TypeScript version you have:

C:\Program Files (x86)\Microsoft SDKs\TypeScript\
C:\Program Files\Microsoft SDKs\TypeScript\

Right-click the folder showing the version number then 'copy as path'.

Paste this into your system path (quick access - Windows key then type 'env'). Then open a new command prompt console as administrator and 'tsc' should work.

Answer 6

As new path variable, don't use the displayed tsc version number but the TypeScript Folder Name which is different.

Sample :

tsc -v display 2.4.1 

but TypeScript directory is

C:\\Program Files (x86)\\Microsoft SDKs\\TypeScript\\2.4

Answer 7

在 CMD 类型where tsc如果它没有显示这样的路径C:\\Program Files (x86)\\Microsoft SDKs\\TypeScript\\typescript version you installed\\这意味着你的 tsc 没有从这里运行。你需要改变环境按照@TranslucentCloud的回答手动设置路径。

Answer 8

只需删除 AppData\\Roaming\\npm\\tsc.ps1 文件即可解决问题。

Answer 9

In my case, I did install typescript globally by using -g flag but tsc was not recognized. It turns out that below directory was not included in path environment variable:

C:\Users\Jitendra\AppData\Roaming\npm

Adding this directory to path variable worked for me.