It appears you have a well-structured Git repository with various files, including SVG icons and HTML documents. Here's a brief overview:

backend/node_modules/svgo/plugins/cleanupIds.js

@@ -0,0 +1,265 @@
+'use strict';
+
+/**
+ * @typedef {import('../lib/types').XastElement} XastElement
+ */
+
+const { visitSkip } = require('../lib/xast.js');
+const { hasScripts, findReferences } = require('../lib/svgo/tools');
+
+exports.name = 'cleanupIds';
+exports.description = 'removes unused IDs and minifies used';
+
+const generateIdChars = [
+  'a',
+  'b',
+  'c',
+  'd',
+  'e',
+  'f',
+  'g',
+  'h',
+  'i',
+  'j',
+  'k',
+  'l',
+  'm',
+  'n',
+  'o',
+  'p',
+  'q',
+  'r',
+  's',
+  't',
+  'u',
+  'v',
+  'w',
+  'x',
+  'y',
+  'z',
+  'A',
+  'B',
+  'C',
+  'D',
+  'E',
+  'F',
+  'G',
+  'H',
+  'I',
+  'J',
+  'K',
+  'L',
+  'M',
+  'N',
+  'O',
+  'P',
+  'Q',
+  'R',
+  'S',
+  'T',
+  'U',
+  'V',
+  'W',
+  'X',
+  'Y',
+  'Z',
+];
+const maxIdIndex = generateIdChars.length - 1;
+
+/**
+ * Check if an ID starts with any one of a list of strings.
+ *
+ * @type {(string: string, prefixes: string[]) => boolean}
+ */
+const hasStringPrefix = (string, prefixes) => {
+  for (const prefix of prefixes) {
+    if (string.startsWith(prefix)) {
+      return true;
+    }
+  }
+  return false;
+};
+
+/**
+ * Generate unique minimal ID.
+ *
+ * @param {?number[]} currentId
+ * @returns {number[]}
+ */
+const generateId = (currentId) => {
+  if (currentId == null) {
+    return [0];
+  }
+  currentId[currentId.length - 1] += 1;
+  for (let i = currentId.length - 1; i > 0; i--) {
+    if (currentId[i] > maxIdIndex) {
+      currentId[i] = 0;
+      if (currentId[i - 1] !== undefined) {
+        currentId[i - 1]++;
+      }
+    }
+  }
+  if (currentId[0] > maxIdIndex) {
+    currentId[0] = 0;
+    currentId.unshift(0);
+  }
+  return currentId;
+};
+
+/**
+ * Get string from generated ID array.
+ *
+ * @type {(arr: number[]) => string}
+ */
+const getIdString = (arr) => {
+  return arr.map((i) => generateIdChars[i]).join('');
+};
+
+/**
+ * Remove unused and minify used IDs
+ * (only if there are no any <style> or <script>).
+ *
+ * @author Kir Belevich
+ *
+ * @type {import('./plugins-types').Plugin<'cleanupIds'>}
+ */
+exports.fn = (_root, params) => {
+  const {
+    remove = true,
+    minify = true,
+    preserve = [],
+    preservePrefixes = [],
+    force = false,
+  } = params;
+  const preserveIds = new Set(
+    Array.isArray(preserve) ? preserve : preserve ? [preserve] : [],
+  );
+  const preserveIdPrefixes = Array.isArray(preservePrefixes)
+    ? preservePrefixes
+    : preservePrefixes
+      ? [preservePrefixes]
+      : [];
+  /**
+   * @type {Map<string, XastElement>}
+   */
+  const nodeById = new Map();
+  /**
+   * @type {Map<string, {element: XastElement, name: string }[]>}
+   */
+  const referencesById = new Map();
+  let deoptimized = false;
+
+  return {
+    element: {
+      enter: (node) => {
+        if (!force) {
+          // deoptimize if style or scripts are present
+          if (
+            (node.name === 'style' && node.children.length !== 0) ||
+            hasScripts(node)
+          ) {
+            deoptimized = true;
+            return;
+          }
+
+          // avoid removing IDs if the whole SVG consists only of defs
+          if (node.name === 'svg') {
+            let hasDefsOnly = true;
+            for (const child of node.children) {
+              if (child.type !== 'element' || child.name !== 'defs') {
+                hasDefsOnly = false;
+                break;
+              }
+            }
+            if (hasDefsOnly) {
+              return visitSkip;
+            }
+          }
+        }
+
+        for (const [name, value] of Object.entries(node.attributes)) {
+          if (name === 'id') {
+            // collect all ids
+            const id = value;
+            if (nodeById.has(id)) {
+              delete node.attributes.id; // remove repeated id
+            } else {
+              nodeById.set(id, node);
+            }
+          } else {
+            const ids = findReferences(name, value);
+            for (const id of ids) {
+              let refs = referencesById.get(id);
+              if (refs == null) {
+                refs = [];
+                referencesById.set(id, refs);
+              }
+              refs.push({ element: node, name });
+            }
+          }
+        }
+      },
+    },
+
+    root: {
+      exit: () => {
+        if (deoptimized) {
+          return;
+        }
+        /**
+         * @param {string} id
+         * @returns {boolean}
+         */
+        const isIdPreserved = (id) =>
+          preserveIds.has(id) || hasStringPrefix(id, preserveIdPrefixes);
+        /** @type {?number[]} */
+        let currentId = null;
+        for (const [id, refs] of referencesById) {
+          const node = nodeById.get(id);
+          if (node != null) {
+            // replace referenced IDs with the minified ones
+            if (minify && isIdPreserved(id) === false) {
+              /** @type {?string} */
+              let currentIdString = null;
+              do {
+                currentId = generateId(currentId);
+                currentIdString = getIdString(currentId);
+              } while (
+                isIdPreserved(currentIdString) ||
+                (referencesById.has(currentIdString) &&
+                  nodeById.get(currentIdString) == null)
+              );
+              node.attributes.id = currentIdString;
+              for (const { element, name } of refs) {
+                const value = element.attributes[name];
+                if (value.includes('#')) {
+                  // replace id in href and url()
+                  element.attributes[name] = value.replace(
+                    `#${encodeURI(id)}`,
+                    `#${currentIdString}`,
+                  );
+                } else {
+                  // replace id in begin attribute
+                  element.attributes[name] = value.replace(
+                    `${id}.`,
+                    `${currentIdString}.`,
+                  );
+                }
+              }
+            }
+            // keep referenced node
+            nodeById.delete(id);
+          }
+        }
+        // remove non-referenced IDs attributes from elements
+        if (remove) {
+          for (const [id, node] of nodeById) {
+            if (isIdPreserved(id) === false) {
+              delete node.attributes.id;
+            }
+          }
+        }
+      },
+    },
+  };
+};