Can't get cljs repl to work

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Maciek Kamiński

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Feb 7, 2018, 6:29:32 PM2/7/18

to Luminus

After generating new cljs luminous project I can start figwheel:

Connecting to remote nREPL server...

Clojure 1.9.0

(start-fw)

Figwheel: Starting server at http://0.0.0.0:3449

Figwheel: Watching build - app

Figwheel: Cleaning build - app

Compiling "target/cljsbuild/public/js/app.js" from ["src/cljs" "src/cljc" "env/dev/cljs"]...

Successfully compiled "target/cljsbuild/public/js/app.js" in 16.104 seconds.

Figwheel: Starting CSS Watcher for paths ["resources/public/css"]

Figwheel: Starting nREPL server on port: 7002

=> nil

No luck starting cljs repl:

user=> (cljs)

Launching ClojureScript REPL for build: app

Figwheel Controls:

(stop-autobuild) ;; stops Figwheel autobuilder

(start-autobuild [id ...]) ;; starts autobuilder focused on optional ids

(switch-to-build id ...) ;; switches autobuilder to different build

(reset-autobuild) ;; stops, cleans, and starts autobuilder

(reload-config) ;; reloads build config and resets autobuild

(build-once [id ...]) ;; builds source one time

(clean-builds [id ..]) ;; deletes compiled cljs target files

(print-config [id ...]) ;; prints out build configurations

(fig-status) ;; displays current state of system

(figwheel.client/set-autoload false) ;; will turn autoloading off

(figwheel.client/set-repl-pprint false) ;; will turn pretty printing off

Switch REPL build focus:

:cljs/quit ;; allows you to switch REPL to another build

Docs: (doc function-name-here)

Exit: Control+C or :cljs/quit

Results: Stored in vars *1, *2, *3, *e holds last exception object

Prompt will show when Figwheel connects to your application

!!! Can't change/establish root binding of: *cljs-repl-env* with set

Exception Failed to launch Figwheel CLJS REPL: nREPL connection found but unable to load piggieback.

This is commonly caused by

A) not providing piggieback as a dependency and/or

B) not adding piggieback middleware into your nrepl middleware chain.

example profile.clj code:

-----

:profiles {:dev {:dependencies [[com.cemerick/piggieback <current-version>]

[org.clojure/tools.nrepl <current-version>]]

:repl-options {:nrepl-middleware [cemerick.piggieback/wrap-cljs-repl]}}}

-----

Please see the documentation for piggieback here https://github.com/cemerick/piggieback#installation

Note: Cider will inject this config into your project.clj.

This can cause confusion when your are not using Cider. figwheel-sidecar.repl/eval28799/fn--28800 (repl.clj:167)