TypeScript

A few tips in order

• restart the terminal
• restart the machine
• reinstall nodejs + then run npm install typescript -g

If it still doesn't work run npm config get prefix to see where npm install -g is putting files (append bin to the output) and make sure that they are in the path (the node js setup does this. Maybe you forgot to tick that option).

It took me a while to figure out the solution to this problem - it's in the original question. You need to have a script that calls tsc in your package.json file so that you can run:

npm run tsc 

Include -- before you pass in options (or just include them in the script):

npm run tsc -- -v

Here's an example package.json:

{
  "name": "foo",
  "scripts": {
    "tsc": "tsc"
  },
  "dependencies": {
    "typescript": "^1.8.10"
  }
}

npm install typescript installs it locally to the project. I would go further and add --save-dev so it only gets listed under devDependencies, not dependencies.

You can still run TypeScript in that situation. Your best bet is to add entries to the "scripts" key in package.json, like this:

{
    "name": "blah",
    "version": "1.0.0",
    "description": "...",
    "scripts": {
        "build": "tsc command arguments go here"
    },
    "keywords": [],
    "author": "...",
    "license": "...",
    "devDependencies": {
        "typescript": "^4.5.5"
    }
}

Then you run that command via:

npm run build

Node.js will find tsc in node_modules and run it.