Current doc says "typescript" needs to be installed for TypeScript support, but I believe `ts-node` required as well

[soswow]

At https://gruntjs.com/blog/2018-08-15-grunt-cli-1.3.0-released I found this.

With >= 1.3.0, if you would like to write your Gruntfile in TypeScript, rename your Gruntfile to end with the appropriate extension: Gruntfile.ts and install the appropriate interpreter, npm install typescript.

It feels like what it should be is npm install typescript ts-node instead. Correct me if I am wrong. I found that extensions over here https://github.com/gruntjs/grunt-cli/blob/master/bin/grunt#L9 has this about .ts file type.

'.ts': [
      'ts-node/register',
      'typescript-node/register',
      'typescript-register',
      'typescript-require'
    ],

So, I assume ts-node needs to be installed as well.