langInjection/resources/intellij.graphql.langInjection.xml

<idea-plugin package="com.intellij.graphql.langInjection">
  <dependencies>
    <plugin id="com.intellij.modules.lang"/>
    <module name="intellij.platform.langInjection"/>
  </dependencies>

  <extensions defaultExtensionNs="com.intellij">
    <applicationService serviceInterface="com.intellij.lang.jsgraphql.ide.injection.GraphQLCommentBasedInjectionHelper"
                        serviceImplementation="com.intellij.graphql.langInjection.GraphQLCommentBasedInjectionHelperImpl"/>
  </extensions>
</idea-plugin>