I wrote a macro in ClojureScript and wanted to test the macro by using
println function like this,
;; qna/macro.clj
(ns qna.macro)
(defmacro my-add [a b]
(println "a =" a "b =" b) ; <-- Here
`(+ ~a ~b))
;; qna/main.cljs
(ns qna.main
(:require-macros [qna.macro :refer [my-add]]))
(defn ^:export main []
(my-add 2 3))
resources/public/index.html and project.clj are like the following.
;; resources/public/index.html
<!doctype html>
<html lang="en">
<head>
<meta charset='utf-8'>
<title>QnA Demo</title>
</head>
<body>
<h2>QnA Demo</h1>
<div id="app"></div>
<script src="js/main.js"></script>
<script>qna.main.main();</script>
</body>
</html>
;; project.clj
(defproject qna "0.1.0-SNAPSHOT"
:dependencies [[org.clojure/clojure "1.9.0"]
[org.clojure/clojurescript "1.10.339"]]
:min-lein-version "2.6.0"
:plugins [[lein-cljsbuild "1.1.7"]
[lein-figwheel "0.5.16"]]
:clean-targets ^{:protect false}
["target"
"resources/public/js/out"
"resources/public/js/main.js"]
:cljsbuild
{:builds
[{:id "dev"
:source-paths ["src"]
:compiler {:main qna.main
:output-to "resources/public/js/main.js"
:output-dir "resources/public/js/out/"
:asset-path "js/out/"
:optimizations :none
:source-map true
:pretty-print true} }]})
When I open the above .html file in the browser, I encounter the following
error.
Uncaught SyntaxError: Unexpected identifier in main.js:4
And the compiled main.js file is like this.
// Compiled by ClojureScript 1.10.339 {}
goog.provide('qna.main');
goog.require('cljs.core');
a = 2 b = 3 // <-- embedded printed result
qna.main.main = (function qna$main$main(){
return ((2) + (3));
});
goog.exportSymbol('qna.main.main', qna.main.main);
//# sourceMappingURL=main.js.map
To sum up, whenever I evalute (println ...) within a macro, the printed
result doesn't go to the REPL but is embedded into the compiled .js file.
If this is a bug of ClojureScript, I will register this error in the
ClojureScript JIRA.
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