Test types (#4140)

* Distinguish request and response data types

* Fix Axios headers type

`axios.headers` is not of the same type as `request.headers`, so a new type
`AxiosDefaults` was introduced

* Replace grunt-ts with dtslint

This asserts that the type definitions are valid in the specified TypeScript
version and above. This is the same tool that is used by DefinitelyTyped.

* Remove grunt-ts

* Restore typescript dependency

* Fix missing semicolons
Co-authored-by: NClaas Augner <github@caugner.de>
Co-authored-by: NJay <jasonsaayman@gmail.com>

Gruntfile.js

@@ -12,19 +12,6 @@ module.exports = function(grunt) {
       dist: 'dist/**'
     },
 
-    ts: {
-      test: {
-        options: {
-          lib: [
-            'es5',
-            'es2015.promise',
-            'dom'
-          ]
-        },
-        src: ['typings/index.d.ts', 'test/typescript/*.ts']
-      }
-    },
-
     package2bower: {
       all: {
         fields: [
@@ -116,7 +103,7 @@ module.exports = function(grunt) {
       ';'].join(''));
   });
 
-  grunt.registerTask('test', 'Run the jasmine and mocha tests', ['eslint', 'mochaTest', 'karma:single', 'ts']);
+  grunt.registerTask('test', 'Run the jasmine and mocha tests', ['eslint', 'mochaTest', 'karma:single']);
   grunt.registerTask('build', 'Run webpack and bundle the source', ['clean', 'webpack']);
   grunt.registerTask('version', 'Sync version info for a release', ['usebanner', 'package2bower', 'package2env']);
 };

index.d.ts

-export type AxiosRequestHeaders = Record<string, string>
+// TypeScript Version: 3.0
+
+export type AxiosRequestHeaders = Record<string, string>;
 
 export type AxiosResponseHeaders = Record<string, string> & {
   "set-cookie"?: string[]
-}
+};
 
 export interface AxiosRequestTransformer {
   (data: any, headers?: AxiosRequestHeaders): any;
@@ -26,7 +28,7 @@ export interface AxiosProxyConfig {
   port: number;
   auth?: {
     username: string;
-    password:string;
+    password: string;
   };
   protocol?: string;
 }
@@ -41,7 +43,7 @@ export type Method =
   | 'patch' | 'PATCH'
   | 'purge' | 'PURGE'
   | 'link' | 'LINK'
-  | 'unlink' | 'UNLINK'
+  | 'unlink' | 'UNLINK';
 
 export type ResponseType =
   | 'arraybuffer'
@@ -49,9 +51,9 @@ export type ResponseType =
   | 'document'
   | 'json'
   | 'text'
-  | 'stream'
+  | 'stream';
 
-export interface TransitionalOptions{
+export interface TransitionalOptions {
   silentJSONParsing?: boolean;
   forcedJSONParsing?: boolean;
   clarifyTimeoutError?: boolean;
@@ -89,7 +91,25 @@ export interface AxiosRequestConfig<D = any> {
   decompress?: boolean;
   transitional?: TransitionalOptions;
   signal?: AbortSignal;
-  insecureHTTPParser?: boolean
+  insecureHTTPParser?: boolean;
+}
+
+export interface HeadersDefaults {
+  common: AxiosRequestHeaders;
+  delete: AxiosRequestHeaders;
+  get: AxiosRequestHeaders;
+  head: AxiosRequestHeaders;
+  post: AxiosRequestHeaders;
+  put: AxiosRequestHeaders;
+  patch: AxiosRequestHeaders;
+  options?: AxiosRequestHeaders;
+  purge?: AxiosRequestHeaders;
+  link?: AxiosRequestHeaders;
+  unlink?: AxiosRequestHeaders;
+}
+
+export interface AxiosDefaults<D = any> extends Omit<AxiosRequestConfig<D>, 'headers'> {
+  headers: HeadersDefaults;
 }
 
 export interface AxiosResponse<T = unknown, D = any>  {
@@ -148,13 +168,13 @@ export interface AxiosInterceptorManager<V> {
 
 export class Axios {
   constructor(config?: AxiosRequestConfig);
-  defaults: AxiosRequestConfig;
+  defaults: AxiosDefaults;
   interceptors: {
     request: AxiosInterceptorManager<AxiosRequestConfig>;
     response: AxiosInterceptorManager<AxiosResponse>;
   };
   getUri(config?: AxiosRequestConfig): string;
-  request<T = unknown, R = AxiosResponse<T>, D = any> (config: AxiosRequestConfig<D>): Promise<R>;
+  request<T = unknown, R = AxiosResponse<T>, D = any>(config: AxiosRequestConfig<D>): Promise<R>;
   get<T = unknown, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
   delete<T = unknown, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
   head<T = unknown, R = AxiosResponse<T>, D = any>(url: string, config?: AxiosRequestConfig<D>): Promise<R>;
@@ -176,7 +196,7 @@ export interface AxiosStatic extends AxiosInstance {
   Axios: typeof Axios;
   readonly VERSION: string;
   isCancel(value: any): boolean;
-  all<T>(values: (T | Promise<T>)[]): Promise<T[]>;
+  all<T>(values: Array<T | Promise<T>>): Promise<T[]>;
   spread<T, R>(callback: (...args: T[]) => R): (array: T[]) => R;
   isAxiosError(payload: any): payload is AxiosError;
 }

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "types": "index.d.ts",
   "scripts": {
-    "test": "grunt test",
+    "test": "grunt test && dtslint",
     "start": "node ./sandbox/server.js",
     "build": "NODE_ENV=production grunt build",
     "preversion": "grunt version && npm test",
@@ -35,6 +35,7 @@
   "devDependencies": {
     "abortcontroller-polyfill": "^1.5.0",
     "coveralls": "^3.0.0",
+    "dtslint": "^4.1.6",
     "es6-promise": "^4.2.4",
     "grunt": "^1.3.0",
     "grunt-banner": "^0.6.0",
@@ -44,7 +45,6 @@
     "grunt-eslint": "^23.0.0",
     "grunt-karma": "^4.0.0",
     "grunt-mocha-test": "^0.13.3",
-    "grunt-ts": "^6.0.0-beta.19",
     "grunt-webpack": "^4.0.2",
     "istanbul-instrumenter-loader": "^1.0.0",
     "jasmine-core": "^2.4.1",

test/typescript/axios.ts

@@ -8,7 +8,7 @@ import axios, {
   CancelToken,
   CancelTokenSource,
   Canceler
-} from '../../';
+} from 'axios';
 
 const config: AxiosRequestConfig = {
   url: '/user',
@@ -170,8 +170,8 @@ axios.patch<User>('/user', { name: 'foo', id: 1 })
 // (Typed methods) with custom response type
 
 const handleStringResponse = (response: string) => {
-  console.log(response)
-}
+  console.log(response);
+};
 
 axios.get<User, string>('/user?id=12345')
   .then(handleStringResponse)
@@ -342,11 +342,11 @@ axios.get('/user')
 
 axios.get('/user')
   .catch((error: any) => 'foo')
-  .then((value: string) => {});
+  .then((value) => {});
 
 axios.get('/user')
   .catch((error: any) => Promise.resolve('foo'))
-  .then((value: string) => {});
+  .then((value) => {});
 
 // Cancellation
 

tsconfig.json

+{
+  "compilerOptions": {
+    "module": "es2015",
+    "lib": ["dom", "es2015"],
+    "types": [],
+    "moduleResolution": "node",
+    "strict": true,
+    "noEmit": true,
+    "baseUrl": ".",
+    "paths": {
+      "axios": ["."]
+    }
+  }
+}

tslint.json

+{ 
+  "extends": "dtslint/dtslint.json",
+  "rules": {
+    "no-unnecessary-generics": false
+  }
+}