How can I mark methods created with `reify` with ^:export, so that the Closure compiler doesn't rename them?

Question

When creating JavaScript objects with reify, how can I mark the methods with ^:export so that the Google Closure compiler doesn't rename them in advanced mode?

For example:

(reify
   Object
   (foo [this] ...)
   (bar [this] ...))

I've tried

(reify
   Object
   (^:export foo [this] ...)
   (^:export bar [this] ...))

but this doesn't seem to help, and the names still get changed with advanced optimizations.

If there isn't a way to do this, how can I construct a JavaScript object with methods, other than creating a plain js-obj and using set! to set functions to properties (where I'm not sure how to prevent advanced optimizations from breaking things either)?

Answer 1

You have to provide ^:export on your protocol methods as you will call them in JS, not methods from your reified object directly.

(ns example.core)

(defprotocol MyProtocol
  (^:export foo [this])

(defn ^:export create []
  (reify
    MyProtocol
    (foo [this] "bar")))

Then you can use it from JS:

var a = example.core.create();
var b = example.core.foo(a);
// b = "bar"

I tried it with the current cljs.jar and it emitted optimized JS with original foo name.