1 files changed, 65 insertions, 0 deletions
diff --git a/node_modules/svgo/plugins/removeUselessDefs.js b/node_modules/svgo/plugins/removeUselessDefs.js
new file mode 100644
index 00000000..46461a98
--- /dev/null
+++ b/node_modules/svgo/plugins/removeUselessDefs.js
@@ -0,0 +1,65 @@
+'use strict';
+
+/**
+ * @typedef {import('../lib/types').XastElement} XastElement
+ */
+
+const { detachNodeFromParent } = require('../lib/xast.js');
+const { elemsGroups } = require('./_collections.js');
+
+exports.name = 'removeUselessDefs';
+exports.description = 'removes elements in <defs> without id';
+
+/**
+ * Removes content of defs and properties that aren't rendered directly without ids.
+ *
+ * @author Lev Solntsev
+ *
+ * @type {import('./plugins-types').Plugin<'removeUselessDefs'>}
+ */
+exports.fn = () => {
+  return {
+    element: {
+      enter: (node, parentNode) => {
+        if (node.name === 'defs') {
+          /**
+           * @type {Array<XastElement>}
+           */
+          const usefulNodes = [];
+          collectUsefulNodes(node, usefulNodes);
+          if (usefulNodes.length === 0) {
+            detachNodeFromParent(node, parentNode);
+          }
+          // TODO remove legacy parentNode in v4
+          for (const usefulNode of usefulNodes) {
+            Object.defineProperty(usefulNode, 'parentNode', {
+              writable: true,
+              value: node,
+            });
+          }
+          node.children = usefulNodes;
+        } else if (
+          elemsGroups.nonRendering.includes(node.name) &&
+          node.attributes.id == null
+        ) {
+          detachNodeFromParent(node, parentNode);
+        }
+      },
+    },
+  };
+};
+
+/**
+ * @type {(node: XastElement, usefulNodes: Array<XastElement>) => void}
+ */
+const collectUsefulNodes = (node, usefulNodes) => {
+  for (const child of node.children) {
+    if (child.type === 'element') {
+      if (child.attributes.id != null || child.name === 'style') {
+        usefulNodes.push(child);
+      } else {
+        collectUsefulNodes(child, usefulNodes);
+      }
+    }
+  }
+};