GraalVM 22.2+ needs `gu install js` for JavaScript to be available

.github/workflows/ci.yml

@@ -29,6 +29,10 @@ jobs:
       - name: Set TRUFFLERUBYOPT
         run: echo "TRUFFLERUBYOPT=--jvm --polyglot" >> $GITHUB_ENV
         if: startsWith(matrix.ruby, 'truffleruby+graalvm')
+      - name: Install GraalVM js component
+        run: if ! gu list | grep '^js '; then gu install js; fi
+        if: startsWith(matrix.ruby, 'truffleruby+graalvm')
+
       - name: Run test
         run: rake
       - name: Install gem

lib/execjs/graaljs_runtime.rb

@@ -136,6 +136,7 @@ module ExecJS
 
       unless Polyglot.languages.include? "js"
         warn "The language 'js' is not available, you likely need to `export TRUFFLERUBYOPT='--jvm --polyglot'`", uplevel: 0 if $VERBOSE
+        warn "You also need to install the 'js' component with 'gu install js' on GraalVM 22.2+", uplevel: 0 if $VERBOSE
         warn "Note that you need TruffleRuby+GraalVM and not just the TruffleRuby standalone to use #{self.class}", uplevel: 0 if $VERBOSE
         return @available = false
       end