docs: private Function<Expression, Statement> addNodeToPlaceholderMap(
        String mapKey, StandaloneNode node) {
      return putToMapFunction(
          mapKey,
          placeholderCompiler.compileToSoyValueProvider(
              mapKey,
              node,
              /* prefix= */ ExtraCodeCompiler.NO_OP,
              /* suffix= */ ExtraCodeCompiler.NO_OP));
    }