How to generate jsdoc-style comments ?

for example:

/** @type {Aarray} array */

/**
 * @param {string} str
 */

Thank you.

[MadeOfMagicAndWires]

The following line overwrites javascripts alternative delimiters to /** */:
let g:NERDCustomDelimiters = { 'javascript': { 'left': '//', 'leftAlt': '/**','rightAlt': '*/' } }

Just add it to your init.vim and it should work.

The only problem (for me at least) is that the justification for multline comments is kind of wonky:

/**
  * this is a sexy comment
  */

instead of

/**
 * this is a sexy comment
 */

So it's not a perfect solution, but it's the closest you can get with just NERDCommenter; one might wonder whether it's more effort to do it this way or to just manually add another asterisk...