Argument type is not assignable to parameter type when passing child

Avatar
Permanently deleted user
创建于

Hello,

I'm new to JavaScript and PHPStorm.

I have object A and B where B.prototype = new A();

Then I have a function and pass new B object as argument and it generates:
Argument type B is not assignable to parameter type A warning.

From what I understand JS is not a statically typed language and my warning has to do with:
/**
* @param {A}
*/
before declaration of function in question.

The PHPStorm doesn't seem to recognize that B is a child of A and produces the warning.


Now, in my actual code I don't use .prototype but instead something like:
B = A.extend('GameScene', { } );
And I imagine that complicates things.

My question is of course how do I not get this warnings?

Votes

0

分享

1 条评论
Avatar
Konstantin Ulitin
创建于

Hello,
You should use @extends tag where inheritance is not recornized, e.g.

var A = function() {}

/** @extends A */
var B = A.extend("GameScene", {});

/** @param {A} x */
function f(x) {}

f(new B()); // no warnings here

Inheritance is recognized with statement B.prototype = new A(), so no tag is required here. And please note, that you should use parameter name after type with @param tag. See https://code.google.com/p/jsdoc-toolkit/wiki/TagParam

Regards,
Konstantin
0

请先登录再写评论。