测试

frontend/node_modules/axios/lib/adapters/adapters.js

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+import utils from '../utils.js';
+import httpAdapter from './http.js';
+import xhrAdapter from './xhr.js';
+import * as fetchAdapter from './fetch.js';
+import AxiosError from "../core/AxiosError.js";
+
+/**
+ * Known adapters mapping.
+ * Provides environment-specific adapters for Axios:
+ * - `http` for Node.js
+ * - `xhr` for browsers
+ * - `fetch` for fetch API-based requests
+ * 
+ * @type {Object<string, Function|Object>}
+ */
+const knownAdapters = {
+  http: httpAdapter,
+  xhr: xhrAdapter,
+  fetch: {
+    get: fetchAdapter.getFetch,
+  }
+};
+
+// Assign adapter names for easier debugging and identification
+utils.forEach(knownAdapters, (fn, value) => {
+  if (fn) {
+    try {
+      Object.defineProperty(fn, 'name', { value });
+    } catch (e) {
+      // eslint-disable-next-line no-empty
+    }
+    Object.defineProperty(fn, 'adapterName', { value });
+  }
+});
+
+/**
+ * Render a rejection reason string for unknown or unsupported adapters
+ * 
+ * @param {string} reason
+ * @returns {string}
+ */
+const renderReason = (reason) => `- ${reason}`;
+
+/**
+ * Check if the adapter is resolved (function, null, or false)
+ * 
+ * @param {Function|null|false} adapter
+ * @returns {boolean}
+ */
+const isResolvedHandle = (adapter) => utils.isFunction(adapter) || adapter === null || adapter === false;
+
+/**
+ * Get the first suitable adapter from the provided list.
+ * Tries each adapter in order until a supported one is found.
+ * Throws an AxiosError if no adapter is suitable.
+ * 
+ * @param {Array<string|Function>|string|Function} adapters - Adapter(s) by name or function.
+ * @param {Object} config - Axios request configuration
+ * @throws {AxiosError} If no suitable adapter is available
+ * @returns {Function} The resolved adapter function
+ */
+function getAdapter(adapters, config) {
+  adapters = utils.isArray(adapters) ? adapters : [adapters];
+
+  const { length } = adapters;
+  let nameOrAdapter;
+  let adapter;
+
+  const rejectedReasons = {};
+
+  for (let i = 0; i < length; i++) {
+    nameOrAdapter = adapters[i];
+    let id;
+
+    adapter = nameOrAdapter;
+
+    if (!isResolvedHandle(nameOrAdapter)) {
+      adapter = knownAdapters[(id = String(nameOrAdapter)).toLowerCase()];
+
+      if (adapter === undefined) {
+        throw new AxiosError(`Unknown adapter '${id}'`);
+      }
+    }
+
+    if (adapter && (utils.isFunction(adapter) || (adapter = adapter.get(config)))) {
+      break;
+    }
+
+    rejectedReasons[id || '#' + i] = adapter;
+  }
+
+  if (!adapter) {
+    const reasons = Object.entries(rejectedReasons)
+      .map(([id, state]) => `adapter ${id} ` +
+        (state === false ? 'is not supported by the environment' : 'is not available in the build')
+      );
+
+    let s = length ?
+      (reasons.length > 1 ? 'since :\n' + reasons.map(renderReason).join('\n') : ' ' + renderReason(reasons[0])) :
+      'as no adapter specified';
+
+    throw new AxiosError(
+      `There is no suitable adapter to dispatch the request ` + s,
+      'ERR_NOT_SUPPORT'
+    );
+  }
+
+  return adapter;
+}
+
+/**
+ * Exports Axios adapters and utility to resolve an adapter
+ */
+export default {
+  /**
+   * Resolve an adapter from a list of adapter names or functions.
+   * @type {Function}
+   */
+  getAdapter,
+
+  /**
+   * Exposes all known adapters
+   * @type {Object<string, Function|Object>}
+   */
+  adapters: knownAdapters
+};