What is the correct JSDoc syntax for a local variable?

I usually use something like the code below in my projects.

function example() {
  /**
   * Need to explain the purpose of X here.
   * @type {number}
   */
  var X = 100;

  ...

  /**
   * Need to explain the purpose of Y here.
   * @type {string}
   */
  var Y = 'abc';

  ...

  return Z;
}

one liner:

  /** @type {string} */
  let Y = 'abc';