Using JSDoc with "T extending Component"

get_matching_components<T extends Component>(component_type_to_return: { new (doodad: Doodad): T }): T[]
{
    return this.components.filter(component => component instanceof component_type_to_return)
}

In TypeScript, I created a method to retrieve components based on their type. Now, I want to convert this method into JSDoc format.

** THE UPDATED SOLUTION **

/**
 * Retrieves components of a specified type if attached to the Doodad.
 * @template    {Component} T
 * @param       {{ new (doodad: Doodad): T }}   type    The type of component to retrieve    
 * @return      {T[]}                                   Array of all components of the specified type attached to the Doodad
 */
get_components(type)
{
    return this.components.filter(component => component instanceof type)
}

Answer №1

Here is a possible solution for your issue:

Approach 1

/**
 * @type {{
 *   <T extends Element>(element_type_to_return: { new (item: Item): T }): T[]
 * }}
 */
get_elements(element_type_to_return)
{
    return this.elements
      .filter(element => element instanceof element_type_to_return)
}

Approach 2

/**
 * @template {Element} T
 * @param {{ new (item: Item): T }} element_type_to_return
 * @returns {T[]}
 */
get_elements(element_type_to_return)
{
    return this.elements
      .filter(element => element instanceof element_type_to_return)
}

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