clj -m cljs.main --help

$ clj -m cljs.main --help
Usage: java -cp cljs.jar cljs.main [init-opt*] [main-opt] [arg*]

With no options or args, runs an interactive Read-Eval-Print Loop
                                    
init options:                       
  -co, --compile-opts edn     Options to configure the build, can be an EDN 
                              string or system-dependent path-separated list of 
                              EDN files / classpath resources. Options will be 
                              merged left to right.
   -d, --output-dir path      Set the output directory to use. If supplied, 
                              cljsc_opts.edn in that directory will be used to 
                              set ClojureScript compiler options
  -re, --repl-env env         The REPL environment to use. Built-in supported 
                              values: nashorn, graaljs, node, browser, rhino. 
                              Defaults to browser
  -ro, --repl-opts edn        Options to configure the repl-env, can be an EDN 
                              string or system-dependent path-separated list of 
                              EDN files / classpath resources. Options will be 
                              merged left to right.
   -t, --target name          The JavaScript target. Configures environment 
                              bootstrap and defaults to browser. Supported 
                              values: node or nodejs, nashorn, graaljs, 
                              webworker, none

init options only for --main and --repl:
   -e, --eval string          Evaluate expressions in string; print non-nil 
                              values
   -i, --init path            Load a file or resource
   -v, --verbose bool         If true, will enable ClojureScript verbose logging

init options only for --compile:
   -O, --optimizations level  Set optimization level, only effective with --
                              compile main option. Valid values are: none, 
                              whitespace, simple, advanced
   -o, --output-to file       Set the output compiled file
   -w, --watch paths          Continuously build, only effective with the --
                              compile main option. Specifies a system-dependent 
                              path-separated list of directories to watch.

browser REPL options:
   -H, --host address         Address to bind
   -p, --port number          Port to bind

main options:
   -                          Run a script from standard input
   -c, --compile [ns]         Run a compile. If optional namespace specified, 
                              use as the main entry point. If --repl follows, 
                              will launch a REPL after the compile completes. 
                              If --server follows, will start a web server that 
                              serves the current directory after the compile 
                              completes.
   -h, --help, -?             Print this help message and exit
   -m, --main ns              Call the -main function from a namespace with args
   -r, --repl                 Run a repl
   -s, --serve host:port      Start a simple web server to serve the current 
                              directory
   path                       Run a script from a file or resource

For --main and --repl:

  - Enters the cljs.user namespace
  - Binds *command-line-args* to a seq of strings containing command line
    args that appear after any main option
  - Runs all init options in order
  - Calls a -main function or runs a repl or script if requested

The init options may be repeated and mixed freely, but must appear before
any main option.

In the case of --compile you may supply --repl or --serve options afterwards.

Paths may be absolute or relative in the filesystem or relative to
classpath. Classpath-relative paths have prefix of @ or @/
rlwrap: error: read error on master pty: Input/output error