How to fight tons of unresolved variables warning in WebStorm?

Use JSDoc:

/** * @param {{some_unres_var:string}} data */function getData(data){    console.log(data.some_unres_var);}

JSDoc the object. Then its members.

/** * @param data          Information about the object. * @param data.member   Information about the object's members. */function getData(data){    console.log(data.member);}

• @property for local variables (non parameters).
• Tested in PyCharm. @Nicholi confirms it works in WebStorm.
• The {{ member:type }} syntax Andreas suggested may conflict with Django templates.
• Thanks to Jonny Buchanan's answer citing the @param wiki.

To document arrays of objects, use [] brackets as JSDoc suggests:

/** * @param data * @param data.array_member[].foo */

All other answers are incorrect for the general case. What if you don't get data as a parameter? You don't have JSDoc then:

function niceApiCall(parameters) {  const result = await ...  // HTTP call to the API here  for (const e of result.entries) {    .. // decorate each entry in the result  }  return result;}

WebStorm will warn that "result.entries" is an unresolved variable (field).

The general solution is to add an @namespace declaration:

function niceApiCall(parameters) {  /** @namespace result.entries **/  const result = await ...  // HTTP call to the API here  for (const e of result.entries) {    .. // decorate each entry in the result  }  return result;}