I faced the same problem.
It used to work but it didn't work suddenly.
It worked with your workaround.
I found a strange workaround :
>
> clj --main cljs.main --verbose --repl-opts "{:launch-browser false}"
> --compile hello-world.core --repl
>
> Then open a brower manually.
>
>
> On Sunday, November 11, 2018 at 8:48:13 AM UTC+1, Demeter Purjon wrote:
>>
>> Hello !
>>
>> I strictly followed the tutorial here :
>> https://clojurescript.org/guides/quick-start
>>
>> Clojurescript is perfectly compiling the hello-world.core namespace.
>> Browser shows up, on terminal I can read "Hello World".
>>
>> > clj --main cljs.main --verbose --compile hello-world.core --repl
>>
>> Options passed to ClojureScript compiler: {:output-dir "out",
>> :closure-warnings {:check-types :off, :check-variables :off},
>> :closure-defines {}, :ups-libs nil, :cache-analysis true,
>> :closure-module-roots [], :optimizations :none, :ups-foreign-libs [],
>> :verbose true, :aot-cache true, :preloads [process.env
>> clojure.browser.repl.preload], :ignore-js-module-exts [".css"], :output-to
>> "out/main.js", :preamble ["cljs/imul.js"], :browser-repl true, :ups-externs
>> nil, :opts-cache "cljsc_opts.edn", :source-map true, :cache-analysis-format
>> :transit, :main hello-world.core, :emit-constants nil, :npm-deps false}
>> REPL env options: {:output-dir "out"}
>> Reading analysis cache for
>> jar:file:/home/stup3fait/.m2/repository/org/clojure/clojurescript/1.10.439/clojurescript-1.10.439.jar!/cljs/core.cljs
>> Hello world
>>
>> *But I never get the repl prompt. *
>>
>> No errors in chrome dev console, nor in terminal. Something seems to
>> "block".
>>
>> I tried several version of clojurescript, same problem.
>>
>> From the browser perspective, when I hit F5, there are 4 XHR requests
>> sent to localhost:9000 :
>>
>> Request 1 : response =
>> {"repl":"Thread-263","form":"cljs.core._STAR_print_fn_STAR_ =
>> clojure.browser.repl.repl_print;\ncljs.core._STAR_print_err_fn_STAR_ =
>> clojure.browser.repl.repl_print;\ncljs.core._STAR_print_newline_STAR_ =
>> true;\nif((cljs.core.count.call(null,clojure.browser.repl.print_queue) >
>> (0))){\nclojure.browser.repl.flush_print_queue_BANG_(cljs.core.deref.call(null,clojure.browser.repl.xpc_connection));\n}
>>
>> else {\n}\n"}
>> Request 2 : response = ignore__
>> Request 3 : response = ignore__
>> Request 4 : interstingly, this request do not responds. It's in PENDING
>> state.
>>
>> Those 4 requests are about robots.txt (!?), like :
>> http://localhost:9000/repl?xpc=%7B%22cn%22%3A%22mpJZAw6akG%22%2C%22tp%22%3Anull%2C%22osh%22%3Anull%2C%22ppu%22%3A%22http%3A%2F%2Flocalhost%3A9000%2Frobots.txt%22%2C%22lpu%22%3A%22http%3A%2F%2Flocalhost%3A9000%2Frobots.txt%22%7D
>>
>> I tried both firefox and chrome with same behaviour.
>>
>> This hanging request may not be the reason why my repl never shows up. I
>> don't really understand how the repl and the browser are wired together.
>> I was expecting some kind of websocket connection for communication
>> between browser and repl but none is opened.
>>
>> If I launch a node repl (--repl-env node), I got a repl prompt and can
>> play with my app.
>>
>> When I quit the browser, I have a "Broken pipe" java exception in
>> terminal, so terminal is somehow connected with browser.
>>
>> Did you solve this problem in the past ?
>>
>
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