Merge pull request #115 from eregon/gu_install_js

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

@@ -51,7 +51,7 @@ module ExecJS
       def translate
         convert_js_to_ruby yield
       rescue ForeignException => e
-        if e.message.start_with?('SyntaxError:')
+        if e.message && e.message.start_with?('SyntaxError:')
           error_class = ExecJS::RuntimeError
         else
           error_class = ExecJS::ProgramError
@@ -96,8 +96,10 @@ module ExecJS
 
       def convert_ruby_to_js(value)
         case value
-        when nil, true, false, Integer, Float, String
+        when nil, true, false, Integer, Float
           value
+        when String
+          Truffle::Interop.as_truffle_string value
         when Symbol
           value.to_s
         when Array
@@ -136,6 +138,7 @@ 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