feat: add @robonen/fetch package - lightweight fetch wrapper with V8 optimizations

Co-authored-by: robonen <26167508+robonen@users.noreply.github.com>

core/fetch/src/error.ts

@@ -0,0 +1,70 @@
+import type { FetchContext, FetchOptions, FetchRequest, FetchResponse, IFetchError } from './types';
+
+/**
+ * @name FetchError
+ * @category Fetch
+ * @description Error thrown by $fetch on network failures or non-2xx responses
+ *
+ * @since 0.0.1
+ */
+export class FetchError<T = unknown> extends Error implements IFetchError<T> {
+  request?: FetchRequest;
+  options?: FetchOptions;
+  response?: FetchResponse<T>;
+  data?: T;
+  status?: number;
+  statusText?: string;
+  statusCode?: number;
+  statusMessage?: string;
+
+  constructor(message: string) {
+    super(message);
+    this.name = 'FetchError';
+  }
+}
+
+/**
+ * @name createFetchError
+ * @category Fetch
+ * @description Builds a FetchError from a FetchContext, extracting URL, status, and error message
+ *
+ * @param {FetchContext} context - The context at the point of failure
+ * @returns {FetchError} A populated FetchError instance
+ *
+ * @since 0.0.1
+ */
+export function createFetchError<T = unknown>(context: FetchContext<T>): FetchError<T> {
+  const url
+    = typeof context.request === 'string'
+      ? context.request
+      : context.request instanceof URL
+        ? context.request.href
+        : (context.request as Request).url;
+
+  const statusPart = context.response
+    ? `${context.response.status} ${context.response.statusText}`
+    : '';
+
+  const errorPart = context.error?.message ?? '';
+
+  // Build message from non-empty parts
+  let message = url;
+  if (statusPart) message += ` ${statusPart}`;
+  if (errorPart) message += `: ${errorPart}`;
+
+  const error = new FetchError<T>(message);
+
+  error.request = context.request;
+  error.options = context.options;
+
+  if (context.response !== undefined) {
+    error.response = context.response;
+    error.data = context.response._data;
+    error.status = context.response.status;
+    error.statusText = context.response.statusText;
+    error.statusCode = context.response.status;
+    error.statusMessage = context.response.statusText;
+  }
+
+  return error;
+}