private void newlineIndent() throws IOException {
    if (this.prettyPrinting()) {
      this.out.append(Tokens.NEWLINE);
      for (int i = 0; i < this.level; ++i) {
        this.out.append(this.indent);
      }
    }
  }
Whether a {@link Tokens#VALUE_SEPARATOR} needs to be printed before the beginning of the next object.
nbt/src/main/java/net/kyori/adventure/nbt/TagStringWriter.java