flow like the river

VISUALIZACION/node_modules/htmlnano/lib/modules/removeComments.js

@@ -0,0 +1,54 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = removeComments;
+
+var _helpers = require('../helpers');
+
+/** Removes HTML comments */
+function removeComments(tree, options, removeType) {
+    if (removeType !== 'all' && removeType !== 'safe') {
+        removeType = 'safe';
+    }
+
+    tree.walk(function (node) {
+        if (node.contents && node.contents.length) {
+            node.contents = node.contents.filter(function (content) {
+                return !isCommentToRemove(content, removeType);
+            });
+        } else if (isCommentToRemove(node, removeType)) {
+            node = '';
+        }
+
+        return node;
+    });
+
+    return tree;
+}
+
+function isCommentToRemove(text, removeType) {
+    if (typeof text !== 'string') {
+        return false;
+    }
+
+    if (!(0, _helpers.isComment)(text)) {
+        // Not HTML comment
+        return false;
+    }
+
+    var isNoindex = text === '<!--noindex-->' || text === '<!--/noindex-->';
+    if (removeType === 'safe' && isNoindex) {
+        // Don't remove noindex comments.
+        // See: https://yandex.com/support/webmaster/controlling-robot/html.xml
+        return false;
+    }
+
+    // https://en.wikipedia.org/wiki/Conditional_comment
+    if (removeType === 'safe' && (0, _helpers.isConditionalComment)(text)) {
+        return false;
+    }
+
+    return true;
+}