code: function (namespace) {
          var declaration = importDeclaration(context)
  
          var imports = Exports.get(declaration.source.value, context)
          if (imports == null) return null
  
          if (imports.errors.length) {
            imports.reportErrors(context, declaration)
            return
          }
  
          if (!imports.size) {
            context.report(namespace,
              `No exported names found in module '${declaration.source.value}'.`)
          }
        }
docs: same as above, but does not add names to local map