How to define a clojurescript function in the javascript global namespace at compile time?

Question

I'm looking for a way to define Clojurescript functions in the Javascript global namespace at compile time. What I mean by compile-time is that I want the Clojurescript compiler to output this: function some_fn() { }. I know that this is not idiomatic and everything should reside in a namespace but the environment that I'm in forces me to do this. So, ideally something like (defn ^:global some-fn []) that would work similar to how :export works but ignores the namespace.

I'm aware of the runtime method for defining global functions using goog.global, e.g (set! goog.global.someFunction some-clojure-fn) but this doesn't work in my environment.

Are you aware that if you annotate your function with ^:export you can refer to it directly from javascript? e.g. my.name.space.some_fn() — Stephen Nelson
– Stephen Nelson, Commented Mar 27, 2013 at 10:42
Yes I am. I'm afraid that I really want it to be a top level function because I can't deal with the name.space.prefix stuff. — Frank Versnel
– Frank Versnel, Commented Mar 27, 2013 at 12:07
Kanaka's answer is what you're after then. Window is where top-level stuff lives. — Stephen Nelson
– Stephen Nelson, Commented Mar 27, 2013 at 19:48
some javascript environments don't provide any sort of global object, which means we need to generate var foo = "bar" - is this possible? — tvachon
– tvachon, Commented Nov 14, 2013 at 15:39

kanaka · Accepted Answer · 2016-03-01 17:05:15Z

8

Perhaps you could define it in a namespace and then expose it in the window (or GLOBAL or this depending on your environment) object:

(defn foo [x] (* 2 x))
(aset js/window "foo" myns/foo)  ;; where myns is where foo is defined

You should then be able to call foo from the window (which is the global JavaScript namespace in the browser).

Update: As suggested by @TerjeNorderhaug, you can set a variable in the global namespace like this:

(set! js/foo foo)

edited Mar 1, 2016 at 17:05

answered Mar 6, 2013 at 22:51

kanaka

73.6k24 gold badges148 silver badges143 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Terje Norderhaug Over a year ago

Alternatively set the global with (set! js/foo foo)

Terje Norderhaug · Accepted Answer · 2016-03-01 19:00:23Z

3

Setting a javascript var to an anonymous Clojurescript function will define the compiled function in the Javascript global namespace:

(set! js/some_fn (fn []))

Calling the function works as expected:

(js/some_fn)

answered Mar 1, 2016 at 19:00

Terje Norderhaug

3,68924 silver badges25 bronze badges

Collectives™ on Stack Overflow

How to define a clojurescript function in the javascript global namespace at compile time?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related