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src/boot/axios.ts

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+import { defineBoot } from '#q-app/wrappers';
+import axios, { type AxiosInstance } from 'axios';
+
+declare module 'vue' {
+  interface ComponentCustomProperties {
+    $axios: AxiosInstance;
+    $api: AxiosInstance;
+  }
+}
+
+// Be careful when using SSR for cross-request state pollution
+// due to creating a Singleton instance here;
+// If any client changes this (global) instance, it might be a
+// good idea to move this instance creation inside of the
+// "export default () => {}" function below (which runs individually
+// for each client)
+const api = axios.create({ baseURL: 'https://api.example.com' });
+
+export default defineBoot(({ app }) => {
+  // for use inside Vue files (Options API) through this.$axios and this.$api
+
+  app.config.globalProperties.$axios = axios;
+  // ^ ^ ^ this will allow you to use this.$axios (for Vue Options API form)
+  //       so you won't necessarily have to import axios in each vue file
+
+  app.config.globalProperties.$api = api;
+  // ^ ^ ^ this will allow you to use this.$api (for Vue Options API form)
+  //       so you can easily perform requests against your app's API
+});
+
+export { api };