how can I jsdoc a bind call?

I was trying to annotate a variable with jsdoc so it is read as a function. But using the bind call make the var be annotated as any.

var beaFunction = myFunction.bind(null,"some_string");

//tried those
/**
 * @function 
 * @name getClientConsent
 * @returns {string|null} 
 */
var beaFunction = myFunction.bind(null,"some_string");

/**
 * @function 
 * @returns {string|null} 
 */
var beaFunction = myFunction.bind(null,"some_string");

/**
 * @function 
 */
var beaFunction = myFunction.bind(null,"some_string");
//thing is that having bind here seems to override whatever definition I place

//myFunction does not need annotation, 
function myFunction(key) {
  var d;
  try {
    d= localStorage.getItem(key);
  } catch (error) {
    console.error(error);
    d = null;
  }
  return d;
}

myFunction returns {string|null} but bind gives any. I tried to annotate it as a function but ts-checker still says it is a any.

Any ideas what I can do here using only es5 features?