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+# Upgrade Guide
+
+### 0.18.x -> 0.19.0
+
+#### HTTPS Proxies
+
+Routing through an https proxy now requires setting the `protocol` attribute of the proxy configuration to `https`
+
+### 0.15.x -> 0.16.0
+
+#### `Promise` Type Declarations
+
+The `Promise` type declarations have been removed from the axios typings in favor of the built-in type declarations. If you use axios in a TypeScript project that targets `ES5`, please make sure to include the `es2015.promise` lib. Please see [this post](https://blog.mariusschulz.com/2016/11/25/typescript-2-0-built-in-type-declarations) for details.
+
+### 0.13.x -> 0.14.0
+
+#### TypeScript Definitions
+
+The axios TypeScript definitions have been updated to match the axios API and use the ES2015 module syntax.
+
+Please use the following `import` statement to import axios in TypeScript:
+
+```typescript
+import axios from 'axios';
+
+axios.get('/foo')
+  .then(response => console.log(response))
+  .catch(error => console.log(error));
+```
+
+#### `agent` Config Option
+
+The `agent` config option has been replaced with two new options: `httpAgent` and `httpsAgent`. Please use them instead.
+
+```js
+{
+  // Define a custom agent for HTTP
+  httpAgent: new http.Agent({ keepAlive: true }),
+  // Define a custom agent for HTTPS
+  httpsAgent: new https.Agent({ keepAlive: true })
+}
+```
+
+#### `progress` Config Option
+
+The `progress` config option has been replaced with the `onUploadProgress` and `onDownloadProgress` options.
+
+```js
+{
+  // Define a handler for upload progress events
+  onUploadProgress: function (progressEvent) {
+    // ...
+  },
+
+  // Define a handler for download progress events
+  onDownloadProgress: function (progressEvent) {
+    // ...
+  }
+}
+```
+
+### 0.12.x -> 0.13.0
+
+The `0.13.0` release contains several changes to custom adapters and error handling.
+
+#### Error Handling
+
+Previous to this release an error could either be a server response with bad status code or an actual `Error`. With this release Promise will always reject with an `Error`. In the case that a response was received, the `Error` will also include the response.
+
+```js
+axios.get('/user/12345')
+  .catch((error) => {
+    console.log(error.message);
+    console.log(error.code); // Not always specified
+    console.log(error.config); // The config that was used to make the request
+    console.log(error.response); // Only available if response was received from the server
+  });
+```
+
+#### Request Adapters
+
+This release changes a few things about how request adapters work. Please take note if you are using your own custom adapter.
+
+1. Response transformer is now called outside of adapter.
+2. Request adapter returns a `Promise`.
+
+This means that you no longer need to invoke `transformData` on response data. You will also no longer receive `resolve` and `reject` as arguments in your adapter.
+
+Previous code:
+
+```js
+function myAdapter(resolve, reject, config) {
+  var response = {
+    data: transformData(
+      responseData,
+      responseHeaders,
+      config.transformResponse
+    ),
+    status: request.status,
+    statusText: request.statusText,
+    headers: responseHeaders
+  };
+  settle(resolve, reject, response);
+}
+```
+
+New code:
+
+```js
+function myAdapter(config) {
+  return new Promise(function (resolve, reject) {
+    var response = {
+      data: responseData,
+      status: request.status,
+      statusText: request.statusText,
+      headers: responseHeaders
+    };
+    settle(resolve, reject, response);
+  });
+}
+```
+
+See the related commits for more details:
+- [Response transformers](https://github.com/axios/axios/commit/10eb23865101f9347570552c04e9d6211376e25e)
+- [Request adapter Promise](https://github.com/axios/axios/commit/157efd5615890301824e3121cc6c9d2f9b21f94a)
+
+### 0.5.x -> 0.6.0
+
+The `0.6.0` release contains mostly bug fixes, but there are a couple things to be aware of when upgrading.
+
+#### ES6 Promise Polyfill
+
+Up until the `0.6.0` release ES6 `Promise` was being polyfilled using [es6-promise](https://github.com/jakearchibald/es6-promise). With this release, the polyfill has been removed, and you will need to supply it yourself if your environment needs it.
+
+```js
+require('es6-promise').polyfill();
+var axios = require('axios');
+```
+
+This will polyfill the global environment, and only needs to be done once.
+
+#### `axios.success`/`axios.error`
+
+The `success`, and `error` aliases were deprecated in [0.4.0](https://github.com/axios/axios/blob/master/CHANGELOG.md#040-oct-03-2014). As of this release they have been removed entirely. Instead please use `axios.then`, and `axios.catch` respectively.
+
+```js
+axios.get('some/url')
+  .then(function (res) {
+    /* ... */
+  })
+  .catch(function (err) {
+    /* ... */
+  });
+```
+
+#### UMD
+
+Previous versions of axios shipped with an AMD, CommonJS, and Global build. This has all been rolled into a single UMD build.
+
+```js
+// AMD
+require(['bower_components/axios/dist/axios'], function (axios) {
+  /* ... */
+});
+
+// CommonJS
+var axios = require('axios/dist/axios');
+```