Typescript is not removed even after reinstalling node - node.js

Question

While working on Angular 5 project, I got the following error on compilation :
#angular/compiler-cli#5.2.11 requires typescript#'>=2.4.2 <2.7.0' but 2.7.2 was found instead.
Using this version can result in undefined behaviour and difficult to debug problems.
Please run the following command to install a compatible version of TypeScript.
npm install typescript#'>=2.4.2 <2.7.0'
To disable this warning run "ng set warnings.typescriptMismatch=false".
To fix this error did the following:
Deleted all node_module instances, and uninstalled node from control panel -> add/remove programs.
Reinstalled node
Checked in cmd:npm view typescript version
I received version as 3.2.2
npm uninstall -g typescript
npm cache verify
Still typescript is not removed from npm.
Can some one help me uninstall typescript completely? Been stuck on this for 2 days now.

Answer 1

It seems there is a small mistake in compiler log:
Please run the following command to install a compatible version of TypeScript.
npm install typescript#'>=2.4.2 <2.7.0'
should be
npm install typescript#">=2.4.2 <2.7.0"

Answer 2

Maybe there is a mismatch in your package json. Update the typescript version as suggested and update package.json
run:
npm install typescript#'>=2.4.2 <2.7.0' --save

Answer 3

Check following step:
You call #angular/compiler-cli in global or local(just one folder), you need install typescript same.
Install typescript match '>=2.4.2 <2.7.0', example : typescript#2.6.2, local or global with -g.
Try close your cmd, reopen it (if typescript install global, cmd don't know it change if you don't reopen).
Check your eviroment variable NODE_PATH, if it exist, go to that folder to remove module in that.
To check NODE_PATH, type in your cmd : echo %NODE_PATH%