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app_vue/node_modules/svgo/plugins/removeUnusedNS.js

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+'use strict';
+
+exports.type = 'visitor';
+exports.name = 'removeUnusedNS';
+exports.active = true;
+exports.description = 'removes unused namespaces declaration';
+
+/**
+ * Remove unused namespaces declaration from svg element
+ * which are not used in elements or attributes
+ *
+ * @author Kir Belevich
+ *
+ * @type {import('../lib/types').Plugin<void>}
+ */
+exports.fn = () => {
+  /**
+   * @type {Set<string>}
+   */
+  const unusedNamespaces = new Set();
+  return {
+    element: {
+      enter: (node, parentNode) => {
+        // collect all namespaces from svg element
+        // (such as xmlns:xlink="http://www.w3.org/1999/xlink")
+        if (node.name === 'svg' && parentNode.type === 'root') {
+          for (const name of Object.keys(node.attributes)) {
+            if (name.startsWith('xmlns:')) {
+              const local = name.slice('xmlns:'.length);
+              unusedNamespaces.add(local);
+            }
+          }
+        }
+        if (unusedNamespaces.size !== 0) {
+          // preserve namespace used in nested elements names
+          if (node.name.includes(':')) {
+            const [ns] = node.name.split(':');
+            if (unusedNamespaces.has(ns)) {
+              unusedNamespaces.delete(ns);
+            }
+          }
+          // preserve namespace used in nested elements attributes
+          for (const name of Object.keys(node.attributes)) {
+            if (name.includes(':')) {
+              const [ns] = name.split(':');
+              unusedNamespaces.delete(ns);
+            }
+          }
+        }
+      },
+      exit: (node, parentNode) => {
+        // remove unused namespace attributes from svg element
+        if (node.name === 'svg' && parentNode.type === 'root') {
+          for (const name of unusedNamespaces) {
+            delete node.attributes[`xmlns:${name}`];
+          }
+        }
+      },
+    },
+  };
+};