typescript compiler (tsc) command not working with tsconfig

Question

I installed typescript globally ( npm install typescript -g )

Then created a folder, ran npm --init, then npm intall typescript --save-dev - it installed [email protected]

In the folder , I create 'helloworld.ts`

var msg = 'Hello World';
console.log (msg);

ran tsc command with file option - tsc helloworld.ts and see it compiled to helloworld.js.

Next, I want to use tsconfig.json, so I run tsc --init - this doesn't work, says Unknown option 'init'

i say alright, let me try adding tsconfig.json manually and add it in the folder root as below:

{
    "compilerOptions": {
        "target": "es5"
    },
    "files": [
        "helloworld.ts"
    ]
}

and I run tsc on command prompt, but it won't work and outputs me the syntax, example and options of how to use tsc Syntax: tsc [options] [file] ...

whats wrong?

where tsc gives below:

C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\tsc.exe
C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\tsc.js
C:\Users\Kap\AppData\Roaming\npm\tsc
C:\Users\Kap\AppData\Roaming\npm\tsc.cmd

Answer 1

this is the problem:

C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\tsc.exe
C:\Program Files (x86)\Microsoft SDKs\TypeScript\1.0\tsc.js

uninstall-update-remove-get-rid-off: Visual Studio outdated extensions...

or remove it from the path ...

or rename the folder to confirm the problem ... then nuke it :)

check what happens if you do:

md x
cd x
tsc --init
npm init -y
npm link typescript
echo console.log('it works') > index.ts
tsc -p .
node .

should output

it works

also. I'll need install typescript local to the project if
a module you depend on, depends on it
you need to use a compiler feature in "your" code
you need to use a different version than the installed globally

to init:

tsc --init

to compile

a 'project' (based on tsconfig.json):

tsc -p .

where . means here

to compile 'other' project

tsc -p other/tsconfig.json

More help