flow like the river

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

@@ -0,0 +1,48 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = collapseBooleanAttributes;
+// Source: https://github.com/kangax/html-minifier/issues/63
+var booleanAttributes = ['allowfullscreen', 'async', 'autofocus', 'autoplay', 'checked', 'compact', 'controls', 'declare', 'default', 'defaultchecked', 'defaultmuted', 'defaultselected', 'defer', 'disabled', 'enabled', 'formnovalidate', 'hidden', 'indeterminate', 'inert', 'ismap', 'itemscope', 'loop', 'multiple', 'muted', 'nohref', 'noresize', 'noshade', 'novalidate', 'nowrap', 'open', 'pauseonexit', 'readonly', 'required', 'reversed', 'scoped', 'seamless', 'selected', 'sortable', 'truespeed', 'typemustmatch', 'visible'];
+
+var booleanAttributesIndex = {};
+booleanAttributes.forEach(function (attributeName) {
+    return booleanAttributesIndex[attributeName] = true;
+});
+
+function collapseBooleanAttributes(tree) {
+    tree.match({ attrs: true }, function (node) {
+        var _iteratorNormalCompletion = true;
+        var _didIteratorError = false;
+        var _iteratorError = undefined;
+
+        try {
+            for (var _iterator = Object.keys(node.attrs)[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
+                var attrName = _step.value;
+
+                if (booleanAttributesIndex[attrName]) {
+                    node.attrs[attrName] = true;
+                }
+            }
+        } catch (err) {
+            _didIteratorError = true;
+            _iteratorError = err;
+        } finally {
+            try {
+                if (!_iteratorNormalCompletion && _iterator.return) {
+                    _iterator.return();
+                }
+            } finally {
+                if (_didIteratorError) {
+                    throw _iteratorError;
+                }
+            }
+        }
+
+        return node;
+    });
+
+    return tree;
+}