feat: types

Added types for ServiceError and Utils

src/services/BaseService.ts

@@ -1,9 +1,10 @@
 import axios, { AxiosError, AxiosInstance } from 'axios'
 import { isValidChecksumAddress } from 'ethereumjs-util'
+import { ResponseCodes, ServiceErrorInstance } from '../types'
 
-class ServiceError extends Error {
-  public code: number
-  constructor(message: string, code: number) {
+class ServiceError extends Error implements ServiceErrorInstance {
+  public code: ResponseCodes
+  constructor(message: string, code: ResponseCodes) {
     super(message)
     this.code = code
   }

src/services/Utils.ts

@@ -1,8 +1,9 @@
 import { Transaction } from 'web3/eth/types'
 
 import BaseService from './BaseService'
+import { UtilsInstance } from '../types'
 
-export default class Utils extends BaseService {
+export default class Utils extends BaseService implements UtilsInstance {
   constructor(token: string, apiUrl?: string) {
     super(token, apiUrl)
   }

src/types.ts

@@ -1,13 +1,17 @@
 import { Transaction } from 'web3/eth/types'
 
-export type ResponseCodes = 200 | 401 | 404 | 500 | 504
+export type ResponseCodes = 200 | 400 | 401 | 404 | 500 | 504
 
 type Currency = {
   value: string
   description: string
   subChoices?: Currency[]
 }
 
+export interface ServiceErrorInstance extends Error {
+  code: ResponseCodes
+}
+
 export interface LoanMetadata {
   mediums: Currency[]
   collaterals: Currency[]
@@ -53,6 +57,13 @@ export interface LoanAPIInstance {
   getMetadata(): Promise<LoanMetadata>
 }
 
+export interface UtilsInstance {
+  approveTransfer(address: string, tokenSymbol: string): Promise<Transaction>
+  isTransferApproved(address: string, tokenSymbol: string, amount: number): Promise<boolean>
+  signup(email: string, name: string, password: string, organisation?: string): Promise<string>
+  renewToken(email: string, password: string): Promise<string>
+}
+
 export interface MarketplaceInstance {
   request: LoanAPIInstance
 }