Externs: How to define alias methods?

[Daniel Wirtz]

Hi,

let's say I have to declarations.

var a = function() {}
var b = function() {}

a.prototype.c = b.prototype.c = function() {}

What's the recommended way for putting that, non-inheritance, down to an extern without just duplicating?

[Alan Leung]

Would @typedef work for you?

https://developers.google.com/closure/compiler/docs/js-for-compiler#tags (scroll down a bit)

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[Daniel Wirtz]

Depending on how complex the alias method is, this could become somewhat ugly I think.

For now I am doing the following but I am pretty sure the compiler does not recognize it correctly since b.prototype.c is not an instance but an alias.

/**
 * @constructor
 */
var a = function() {};

a.prototype.c = function() {};

/**
 * @constructor
 */
var b = function() {};

/**
 * @type {a.prototype.c}
 */
b.prototype.c = a.prototype.c;

I also don't know if the following might work:

/**
 * @alias a.prototype.c
 */
b.prototype.c = a.prototype.c;

More ideas?

Am Montag, 11. März 2013 01:54:20 UTC+1 schrieb Alan:

Would @typedef work for you?

https://developers.google.com/closure/compiler/docs/js-for-compiler#tags (scroll down a bit)

On Sun, Mar 10, 2013 at 3:31 PM, Daniel Wirtz <dc...@dcode.io> wrote:

Hi,

let's say I have to declarations.

var a = function() {}
var b = function() {}

a.prototype.c = b.prototype.c = function() {}

What's the recommended way for putting that, non-inheritance, down to an extern without just duplicating?

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[Fredrik Blomqvist]

This sounds a bit similar to a question I asked couple of years ago:

https://groups.google.com/d/msg/closure-compiler-discuss/BB2ONeOzUhc/CfZDNomSwd8J

Although my case it was pure functions.

At that time at least the answer was that you simply had to duplicate, or at best create a separate typedef and use it for both declarations.

Regards

/ Fredrik Blomqvist

[Chad Killingsworth]

This is correct - although there are a few "tricks". Have the alias extend the base type. You must duplicate all static methods. See the jQuery externs for examples ($ is an alias of jQuery).

Chad