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node_modules/fast-xml-parser/src/v6/OutputBuilders/BaseOutputBuilder.js

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+export default class BaseOutputBuilder{
+  constructor(){
+    // this.attributes = {};
+  }
+
+  addAttribute(name, value){
+    if(this.options.onAttribute){
+      //TODO: better to pass tag path
+      const v = this.options.onAttribute(name, value, this.tagName);
+      if(v) this.attributes[v.name] = v.value;
+    }else{
+      name = this.options.attributes.prefix + name + this.options.attributes.suffix;
+      this.attributes[name] = this.parseValue(value, this.options.attributes.valueParsers);
+    }
+  }
+
+  /**
+   * parse value by chain of parsers
+   * @param {string} val 
+   * @returns {any} parsed value if matching parser found
+   */
+    parseValue = function(val, valParsers){
+      for (let i = 0; i < valParsers.length; i++) {
+        let valParser = valParsers[i];
+        if(typeof valParser === "string"){
+          valParser = this.registeredParsers[valParser];
+        }
+        if(valParser){
+          val = valParser.parse(val);
+        }
+      }
+      return val;
+    }
+
+  /**
+   * To add a nested empty tag.
+   * @param {string} key 
+   * @param {any} val 
+   */
+  _addChild(key, val){}
+
+  /**
+   * skip the comment if property is not set
+   */
+  addComment(text){
+    if(this.options.nameFor.comment)
+      this._addChild(this.options.nameFor.comment, text);
+  }
+
+  //store CDATA separately if property is set
+  //otherwise add to tag's value
+  addCdata(text){
+    if (this.options.nameFor.cdata) {
+      this._addChild(this.options.nameFor.cdata, text);
+    } else {
+      this.addRawValue(text || "");
+    }
+  }
+
+  addRawValue = text => this.addValue(text);
+
+  addDeclaration(){
+    if(!this.options.declaration){
+    }else{
+      this.addPi("?xml");
+    }
+    this.attributes = {}
+  }
+}