ts-retrofit

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A declarative and axios based retrofit implementation for JavaScript and TypeScript.

Install

$ npm i ts-retrofit

Quick Overview

Here is a typical service definition and usage:

import { GET, POST, PUT, PATCH, DELETE, BasePath, Header, Path, Body, BaseService, ServiceBuilder, Response } from "ts-retrofit";

interface User {
  id?: number;
  name: string;
  email: string;
}

@BasePath("/api/v1")
class UserService extends BaseService {
  @GET("/users")
  async getUsers(@Header("Authorization") authorization: string): Promise<Response<Array<User>>> { return <Response<Array<User>>> {} };

  @GET("/users/{userId}")
  async getUser(@Header("Authorization") authorization: string, @Path("userId") userId: number): Promise<Response<User>> { return <Response<User>> {} };

  @POST("/users")
  async createUser(@Header("Authorization") authorization: string, @Body user: User): Promise<Response> { return <Response> {} };

  @PUT("/users/{userId}")
  async updateUser(@Header("Authorization") authorization: string, @Path("userId") userId: number, @Body user: User): Promise<Response> { return <Response> {} };

  @PATCH("/users/{userId}")
  async patchUser(@Header("Authorization") authorization: string, @Path("userId") userId: number, @Body user: Partial<User>): Promise<Response> { return <Response> {} };

  @DELETE("/users/{userId}")
  async deleteUser(@Header("Authorization") authorization: string, @Path("userId") userId: number): Promise<Response> { return <Response> {} };
}

(async () => {
  const authorization = "foobar";
  const userService = new ServiceBuilder()
    .setEndpoint("https://www.your-host.com")
    .build(UserService);
  const response = await userService.getUsers(authorization);
  // Now you can get response data from response.data
})()

You can see test file to get more examples.

ServiceBuilder

Example:

import { AxiosRequestConfig } from "axios";
import {
  ServiceBuilder,
  ResponseInterceptorFunction,
  RequestInterceptorFunction,
  RequestInterceptor,
  ResponseInterceptor,
} from "ts-retrofit";

@BasePath("/api/v1")
class ItemService extends BaseService {
  @GET("/items")
  async getItems(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

const RequestInterceptor: RequestInterceptorFunction = (config) => {
  console.log("Before sending request to server.");
  return config;
};

const ResponseInterceptor: ResponseInterceptorFunction = (response) => {
  console.log("After receiving response from server.");
  return response;
};

(async () => {
  const itemService = new ServiceBuilder()
	.setEndpoint(${ENDPOINT})
    .setStandalone(true)
    .setRequestInterceptors(RequestInterceptor)
    .setResponseInterceptors(ResponseInterceptor)
    .build(ItemService);
  const response: any = await itemService.getVersion();
  console.log(response.data);
})();

// outputs:
// Before sending request to server.
// After receiving response from server.
// <response data>

Log

You can set log callback to print some information after request finished (ok/error):

@BasePath("")
export class HealthService extends BaseService {
  @GET("/ping")
  @ResponseStatus(200)
  async ping(): Promise<Response> { return <Response>{} };
}
const myLogCallback = (config: RequestConfig, response: Response) => {
  const log = `[${config.method}] ${config.url} ${response.status}`;
  console.log(log); // [GET] http://localhost:12345/ping 200
};
const service = new ServiceBuilder()
  .setEndpoint("http://localhost:12345")
  .setLogCallback(myLogCallback)
  .build(HealthService);

// or use this
service.setLogCallback(myLogCallback);
const response = await service.ping();

Decorators

BasePath

• Position: Class

BasePath decorator declares the path prefix of a service.

// The common path of ItemService is ${ENDPOINT}/api/v1
@BasePath("/api/v1")
class ItemService extends BaseService {}

HTTP Method Decorators

All HTTP method decorators have an optional second parameter with type HttpMethodOptions:

export interface HttpMethodOptions {
  ignoreBasePath?: boolean;
}

GET

• Position: Method

GET decorator declares that what it decorated use HTTP GET method to request server.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items
  @GET("/items")
  async getItems(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };

  // GET ${ENDPOINT}/items
  @GET("/items", { ignoreBasePath: true })
  async getItemsWithoutBasePath(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

POST

• Position: Method

POST decorator declares that what it decorated use HTTP POST method to request server.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // POST ${ENDPOINT}/api/v1/items
  @POST("/items")
  async createItem(@Body item: Item): Promise<Response> { return <Response> {} };
}

PUT

• Position: Method

PUT decorator declares that what it decorated use HTTP PUT method to request server.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // PUT ${ENDPOINT}/api/v1/items/{itemId}
  @PUT("/items/{itemId}")
  async updateItem(@Path("itemId") itemId: number, @Body item: Item): Promise<Response> { return <Response> {} };
}

PATCH

• Position: Method

PATCH decorator declares that what it decorated use HTTP PATCH method to request server.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // PATCH ${ENDPOINT}/api/v1/items/{itemId}
  @PATCH("/items/{itemId}")
  async patchItem(@Path("itemId") itemId: number, @Body item: Partial<Item>): Promise<Response> { return <Response> {} };
}

DELETE

• Position: Method

DELETE decorator declares that what it decorated use HTTP DELETE method to request server.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // DELETE ${ENDPOINT}/api/v1/items/{itemId}
  @DELETE("/items/{itemId}")
  async deleteItem(@Path("itemId") itemId: number): Promise<Response> { return <Response> {} };
}

HEAD

• Position: Method

HEAD decorator declares that what it decorated use HTTP HEAD method to request server.

@BasePath("/api/v1")
class FileService extends BaseService {
  // HEAD ${ENDPOINT}/api/v1/files/{fileId}
  @HEAD("/files/{fileId}")
  async getFileMetaInfo(@Path("fileId") fileId: number): Promise<Response> { return <Response> {} };
}

OPTIONS

• Position: Method

OPTIONS decorator declares that what it decorated use HTTP OPTIONS method to request server.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // OPTIONS ${ENDPOINT}/api/v1/items/{itemId}
  @OPTIONS("/items/{itemId}")
  async getFileMetaInfo(@Path("itemId") itemId: number): Promise<Response> { return <Response> {} };
}

Headers

• Position: Method

Headers decorator declares that what static HTTP headers should be added to request.

@BasePath("")
export class AuthService extends BaseService {
  @POST("/oauth/token")
  @Headers({
    "Content-Type": "application/x-www-form-urlencoded;charset=utf-8",
    "Accept": "application/json"
  })
  async auth(@Body body: OAuth): Promise<Response<Token>> { return <Response<Token>>{} };
}

Header

• Position: Method Parameter

Header decorator parameterizes the header in HTTP request. Client can provide a value to one header.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items
  async getItems(@Header("Authorization") authorization: string): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

HeaderMap

• Position: Method Parameter

HeaderMap decorator parameterizes the headers in HTTP request. Client can provide values to multi headers.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items
  async getItems(@HeaderMap headers: any): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

Path

• Position: Method Parameter

Path decorator parameterizes the part of path in HTTP request.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items/{itemId}
  @GET("/items/{itemId}")
  async getItem(@Path("itemId") itemId: number): Promise<Response<Item>> { return <Response<Item>> {} };
}

Body

• Position: Method Parameter

Body decorator parameterizes the body in HTTP request.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // POST ${ENDPOINT}/api/v1/items
  @POST("/items")
  async createItem(@Body item: Item): Promise<Response> { return <Response> {} };
}

QueryArrayFormat

• Position: Method

QueryArrayFormat decorator declares that what kind of array format should be used in query.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // getItemsWithQueryArrayFormatIndices(["food", "book", "pet"])
  // GET ${ENDPOINT}/api/v1/items?categories[0]=food&categories[1]=book&categories[2]=pet
  @GET("/items")
  @QueryArrayFormat("indices")
  async getItemsWithQueryArrayFormatIndices(
    @Query("categories") categories: string[]
  ): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
  
  // getItemsWithQueryArrayFormatBrackets(["food", "book", "pet"])
  // GET ${ENDPOINT}/api/v1/items?categories[]=food&categories[]=book&categories[]=pet
  @GET("/items")
  @QueryArrayFormat("brackets")
  async getItemsWithQueryArrayFormatBrackets(
    @Query("categories") categories: string[]
  ): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
  
  // getItemsWithQueryArrayFormatRepeat(["food", "book", "pet"])
  // GET ${ENDPOINT}/api/v1/items?categories=food&categories=book&categories=pet
  @GET("/items")
  @QueryArrayFormat("repeat")
  async getItemsWithQueryArrayFormatRepeat(
    @Query("categories") categories: string[]
  ): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
  
  // getItemsWithQueryArrayFormatComma(["food", "book", "pet"])
  // GET ${ENDPOINT}/api/v1/items?categories=food,book,pet
  @GET("/items")
  @QueryArrayFormat("comma")
  async getItemsWithQueryArrayFormatComma(
    @Query("categories") categories: string[]
  ): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

Queries

• Position: Method

Queries decorator declares that what static queries should be added to request.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items?size=20
  @GET("/items")
  @Queries({
    size: 20,
  })
  async getItems(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

Query

• Position: Method Parameter

Query decorator parameterizes the query in HTTP request. Client can provide a value to one query parameter.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items?size=20
  @GET("/items")
  async getItems(@Query('size') size: number): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

QueryMap

• Position: Method Parameter

QueryMap decorator parameterizes the queries in HTTP request. Client can provide values to multi queries.

@BasePath("")
class SearchService extends BaseService {
  // GET ${ENDPOINT}/search?a=foo&b=bar
  @GET("/search")
  async search(@QueryMap query: SearchQuery): Promise<Response<SearchResult>> { return <Response<SearchResult>> {} };
}

FormUrlEncoded

• Position: Method

FormUrlEncoded declares that the content type is application/x-www-form-urlencoded;charset=utf-8 in HTTP request.

@BasePath("")
export class AuthService extends BaseService {
  @POST("/oauth/token")
  @FormUrlEncoded
  async auth(@Body body: OAuth): Promise<Response<Token>> { return <Response<Token>>{} };
}

Field

• Position: Method Parameter

Field decorator parameterizes the field in HTTP request. It only takes effect when method is decorated by @FormUrlEncoded.

@BasePath("")
export class AuthService extends BaseService {
  @POST("/oauth/token")
  @FormUrlEncoded
  async auth(@Field("username") username: string, @Field("password") password: string): Promise<Response<Token>> { return <Response<Token>>{} };
}

FieldMap

• Position: Method Parameter

FieldMap decorator parameterizes the field in HTTP request. It only takes effect when method is decorated by @FormUrlEncoded.

@BasePath("")
export class AuthService extends BaseService {
  @POST("/oauth/token")
  @FormUrlEncoded
  async auth(@FieldMap fields: OAuth): Promise<Response<Token>> { return <Response<Token>>{} };
}

Multipart

• Position: Method

Multipart decorator declares that the content type is multipart/form-data in HTTP request.

@BasePath("/api/v1")
export class FileService extends BaseService {
  @POST("/upload")
  @Multipart
  async upload(@Part("bucket") bucket: PartDescriptor<string>, @Part("file") file: PartDescriptor<Buffer>): Promise<Response> { return <Response>{} };
}

Part

• Position: Method Parameter

Part decorator parameterizes the part in HTTP request. It only takes effect when method is decorated by @Multipart.

@BasePath("/api/v1")
export class FileService extends BaseService {
  @POST("/upload")
  @Multipart
  async upload(@Part("bucket") bucket: PartDescriptor<string>, @Part("file") file: PartDescriptor<Buffer>): Promise<Response> { return <Response>{} };
}

ResponseType

• Position: Method
• Options: 'arraybuffer' | 'blob' | 'document' | 'json' | 'text' | 'stream'

ResponseType decorator declares response type in axios config.

@BasePath("/api/v1")
export class FileService extends BaseService {
  @GET("/file")
  @ResponseType("stream")
  async getFile(@Path("fileId") fileId: string): Promise<Response> { return <Response>{} };
}

RequestTransformer

• Position: Method

RequestTransformer decorator provides a hook to handle request data before sending request to server.

@BasePath(API_PREFIX)
export class TransformerService extends BaseService {
  @POST("/request-transformer")
  @RequestTransformer((data: any, headers?: any) => {
    data.foo = 'foo'; // add something to request data
    return JSON.stringify(data);
  })
  async createSomething(@Body body: Something): Promise<Response> { return <Response>{} };
}

ResponseTransformer

• Position: Method

ResponseTransformer decorator provides a hook to handle response data after receiving response from server.

@BasePath(API_PREFIX)
export class TransformerService extends BaseService {
  @POST("/request-transformer")
  @RequestTransformer((data: any, headers?: any) => {
    data.foo = 'foo';  // add something to response data
    return JSON.stringify(data);
  })
  async createSomething(@Body body: Something): Promise<Response> { return <Response>{} };
}

Timeout

• Position: Method

Timeout decorator declares timeout in axios config.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items
  @GET("/items")
  @Timeout(3000)
  async getItems(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

ResponseStatus

• Position: Method

ResponseStatus decorator declares status code for method, do nothing just a declaration.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items
  @GET("/items")
  @Timeout(3000)
  async getItems(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

Config

• Position: Method

Config decorator provides a direct way to set config for a request in axios.

@BasePath("/api/v1")
export class ConfigService extends BaseService {
  @GET("/config")
  @Config({
    maxRedirects: 1,
  })
  async getConfig(): Promise<Response> { return <Response>{} };
}

GraphQL and GraphQLVariables

• Position: Method

GraphQL decorator declares query for a GraphQL request.

GraphQLVariables decorator declares variables for a GraphQL request.

const gqlQuery =
`query ($name: String!, $owner: String!) {
  viewer {
    name
    location
  }
  repository(name: $name, owner: $owner) {
    stargazerCount
    forkCount
  }
}`;

@BasePath("")
export class GraphQLService extends BaseService {
  @POST("/graphql")
  @GraphQL(gqlQuery, "UserAndRepo")
  async graphql1(
    @GraphQLVariables variables: any,
  ): Promise<Response> { return <Response>{} };
}

Deprecated

• Position: Method

Deprecated decorator marks a method is deprecated.

@BasePath("/api/v1")
class ItemService extends BaseService {
  // GET ${ENDPOINT}/api/v1/items
  @GET("/items")
  @Deprecated("This method is deprecated")
  async getItems(): Promise<Response<Array<Item>>> { return <Response<Array<Item>>> {} };
}

Decorators Summary

Category	Name	Description	Decorator Position	Example
HTTP Method	@GET	GET Method	Method	@GET("/users")
HTTP Method	@POST	POST Method	Method	@POST("/users")
HTTP Method	@PUT	PUT Method	Method	@PUT("/users/{userId}")
HTTP Method	@PATCH	PATCH Method	Method	@PATCH("/users/{userId}")
HTTP Method	@DELETE	DELETE Method	Method	@DELETE("/users/{userId}")
HTTP Method	@HEAD	HEAD Method	Method	@HEAD("/users/{userId}")
HTTP Method	@OPTIONS	OPTIONS Method	Method	@OPTIONS("/users/{userId}")
Base Path	@BasePath	Specifying the base path of a series of API endpoints	Class	@BasePath("/api/v1")
Static Headers	@Headers	Specifying the static headers of API endpoint	Method	@Headers({ "content-type": "application/x-www-form-urlencoded", "Accept": "application/json" })
Header Parameter	@Header	Parameterized header	Method Parameter	@Header("X-Token")
Header Parameters	@HeaderMap	Parameterized header	Method Parameter	@HeaderMap
Path Parameter	@Path	Specifying parameter in path of API	Method Parameter	@Path("userId")
Body	@Body	Specifying body data	Method Parameter	@Body
Query Array Format	@QueryArrayFormat	Specifying query array format	Method	@QueryArrayFormat('repeat')
Static Query	@Queries	Specifying static query data	Method	@Queries({ page: 1, size: 20, sort: "createdAt:desc" })
Query Parameter	@Query	Parameterized query	Method Parameter	@Query("group")
Query Parameters	@QueryMap	Parameterized query	Method Parameter	@QueryMap
Static Headers	@FormUrlEncoded	Specifying "content-type" to be "application/x-www-form-urlencoded"	Method	@FormUrlEncoded
Field Parameter	@Field	Specifying field in method parameter, only takes effect when method has been decorated by @FormUrlEncoded	Method Parameter	@Field("name")
Field Parameters	@FieldMap	Specifying field map in method parameter, only takes effect when method has been decorated by @FormUrlEncoded	Method Parameter	@FieldMap
Static Headers	@Multipart	Specifying "content-type" to be "multipart/form-data"	Method	@Multipart
Part Parameters	@Part	Specifying field map in method parameter, only takes effect when method has been decorated by @Multipart	Method Parameter	@Part("name")
Response	@ResponseType	Specifying the response type in axios config	Method	@ResponseType("stream")
RequestTransformer	@RequestTransformer	Specifying the request transformer in axios config	Method	@RequestTransformer((data: any, headers?: any) => { data.foo = 'foo'; return JSON.stringify(data); })
ResponseTransformer	@ResponseTransformer	Specifying the response transformer in axios config	Method	@ResponseTransformer((data: any, headers?: any) => { const json = JSON.parse(data); json.foo = 'foo'; return json; })
Timeout	@Timeout	Specifying the timeout in axios config	Method	@Timeout(5000)
ResponseStatus	@ResponseStatus	Declare response status code for method, do nothing just a declaration	Method	@ResponseStatus(204)
Config	@Config	A direct way to set config for a request in axios	Method	@Config({ maxRedirects: 1 })
GraphQL	@GraphQL	Declares query for a GraphQL request.	Method	@GraphQL(gqlQuery, "operationName")
GraphQLVariables	@GraphQLVariables	Declares variables for a GraphQL request.	Method	@GraphQLVariables
Deprecated	@Deprecated	Marks a method is deprecated	Method	@Deprecated() @Deprecated("This method is deprecated")

Test

$ npm test