feat: add defaults support to compatible axios

src/tests/axios-compatible.test.ts

@@ -61,6 +61,26 @@ describe('axios compatible tests', () => {
     assert.strictEqual(data.slice(-10), axiorData?.slice(-10));
   });
 
+  it('should work with `instance.defaults.* = *`', async () => {
+    const axiosInstance = axios.create({ baseURL });
+    const xiorInstance = xior.create({ baseURL });
+    axiosInstance.defaults.headers['x-custom-value'] = '1';
+    xiorInstance.defaults.headers['x-custom-value'] = '1';
+    if (!axiosInstance.defaults.params) {
+      axiosInstance.defaults.params = {};
+    }
+    axiosInstance.defaults.params['x-2'] = '2';
+    xiorInstance.defaults.params['x-2'] = '2';
+
+    const { data } = await axiosInstance.get('/get');
+    const { data: axiorData } = await xiorInstance.get('/get');
+    assert.strictEqual(data.value, '1');
+    assert.strictEqual(axiorData.value, '1');
+
+    assert.strictEqual(data.query['x-2'], '2');
+    assert.strictEqual(axiorData.query['x-2'], '2');
+  });
+
   it('should work with params', async () => {
     const axiosInstance = axios.create({ baseURL: 'https://api.github.com' });
     const xiorInstance = xior.create({ baseURL: 'https://api.github.com/' });

src/xior.ts

@@ -22,8 +22,14 @@ export class xior {
   }
 
   config?: XiorRequestConfig;
+  defaults: XiorInterceptorRequestConfig;
+
   constructor(options?: XiorRequestConfig) {
     this.config = options;
+    this.defaults = {
+      params: {},
+      headers: {},
+    } as XiorInterceptorRequestConfig;
   }
 
   private requestInterceptors: ((
@@ -130,6 +136,7 @@ export class xior {
     let requestConfig: XiorRequestConfig = merge(
       {},
       this.config || {},
+      this.defaults || {},
       typeof options === 'string' ? { url: options } : options || {},
       { headers: {}, params: {} }
     );