feat: add joinURL

app/javascript/shared/helpers/joinUrl.js

@@ -0,0 +1,30 @@
+/**
+ * Join multiple paths together with a base URL
+ * NOTE: This function is not designed to handle query strings or fragments
+ *
+ * @param {string} baseUrl - The base URL to join the paths to
+ * @param  {...string} paths - The paths to join
+ * @returns {string} - The full URL
+ */
+export function joinUrl(baseUrl, ...paths) {
+  // remove empty undefined and null path items
+  // also handle if the path is just a slash or just multiple slashes only
+  const sanitizedPaths = paths.filter(path => {
+    if (!path) return false;
+    if (path === null && path === '') return false;
+    // if path is just a sequence of slashes
+    if (/^\/+$/.test(path)) return false;
+
+    return true;
+  });
+
+  const fullUrl = sanitizedPaths.reduce(
+    (acc, path) => {
+      const sanitizedPath = path.replace(/^\/+|\/+$/g, ''); // Remove leading and trailing slashes from each path segment
+      return `${acc}/${sanitizedPath}`; // Concatenate with a single slash
+    },
+    baseUrl.replace(/\/+$/, '')
+  );
+
+  return fullUrl;
+}