message: Fix variables map to use field name instead of camel cased name.
diff: @@ -111,7 +111,7 @@ export function classDeclarationForOperation(
  const propertyName = camelCase(name);
  const typeName = typeNameFromGraphQLType(generator.context, type);
  const isOptional = !(type instanceof GraphQLNonNull || type.ofType instanceof GraphQLNonNull);
  - return { propertyName, type, typeName, isOptional };
  + return { name, propertyName, type, typeName, isOptional };
  });
  generator.printNewlineIfNeeded();
  propertyDeclarations(generator, properties);
  @@ -122,7 +122,7 @@ export function classDeclarationForOperation(
  generator.withinBlock(() => {
  generator.printOnNewline(wrap(
  `return [`,
  - join(properties.map(({ propertyName }) => `"${propertyName}": ${propertyName}`), ', '),
  + join(properties.map(({ name, propertyName }) => `"${name}": ${propertyName}`), ', '),
  `]`
  ));
  });
  