Mention all the requirements for MiniRacer on TruffleRuby (#257)

Raise there instead of waiting for the `@context.eval` below, for a clearer error.
rubyjs · Aug 17, 2022 · 719abdb · 719abdb
1 parent 9935d5a
commit 719abdb
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/lib/mini_racer/truffleruby.rb b/lib/mini_racer/truffleruby.rb
@@ -71,7 +71,9 @@ def init_unsafe(isolate, snapshot)
       end
 
       unless Polyglot.languages.include? "js"
-        warn "You also need to install the 'js' component with 'gu install js' on GraalVM 22.2+", uplevel: 0 if $VERBOSE
+        raise "The language 'js' is not available, you likely need to `export TRUFFLERUBYOPT='--jvm --polyglot'`\n" \
+          "You also need to install the 'js' component with 'gu install js' on GraalVM 22.2+\n" \
+          "Note that you need TruffleRuby+GraalVM and not just the TruffleRuby standalone to use MiniRacer"
       end
 
       @context = Polyglot::InnerContext.new(on_cancelled: -> {