Epts-Engine (Express-Typescript-Engine)

NOTE: Libraries are created to help me speed up the process of creating projects that can be personalized, you can like it or not, you can use it or ignore it, thanks.

Quickly create express apps, register routes and apply middleware right in the controller

Installation

• With npm:

  $ npm install @pamstarter/epts-engine

• With yarn:

  $ yarn add @pamstarter/epts-engine

Quick Start

Typescript

At file src/app.ts:

import EptsEngine from '@pamstarter/epts-engine';
import { controllers, expressConfig as express } from '~config/app.config';

const app = new EptsEngine({
   app: {
      port: 3000, // server will run at port
      url: 'http://localhost:3000' // config app url for getUrl helper
   },
   express,
   controllers,
});

// Initialize the application and start the server
app.init();

At file src/config/app.config.ts

import { IExpress, IRegisterController } from '@pamstarter/epts-engine';

import WelcomeController from '~controller/welcome.controller';

export const expressConfig: IExpress = {
   use: [
      // Use method like express.use()
   ],
   set: {
      // Use method like express.set()
   }
};

export const controllers: IRegisterController[] = [
   // Register controllers
   WelcomeController,
];

At file src/controllers/welcome.controller.ts

• Controller Config
  • routePrefix: set path start at
  • routeMiddlewareGroups: set of middleware grouped and used within the controller, possibly one or more group names
  • routeMiddlewares: separate set of middleware with different purposes used in controller, can be one or more middleware
  • routes method: return an object whose key is the route method and the value will be an object whose key is the path and its value can be one or more router handlers

import { Controller, IControllerArgs, IRoutes } from '@pamstarter/epts-engine';
import { Request, Response } from 'express';

class WelcomeController extends Controller {
   routePrefix: string = '/welcome'
   routeMiddlewareGroup: 'middleware_group_name' // or [...'middleware_group_name']
   routeMiddlewares: IControllerArgs | IControllerArgs[] = (req, res, next) => {
      next();
   };

   routes(): IRoutes {
      return {
         get: {
            '/': this.helloWorld, // [GET] /welcome/
         },
      };
   }

   helloWorld(req: Request, res: Response) {
      res.json({
         message: 'hello world',
      });
   }
}

export default new WelcomeController;

API Reference

Application

Types:

interface IEptsEngineConfigurations {
   app?: {
      port?: string | number
      url?: string
   };
   express?: IExpress;
   middlewareGroup?: IMiddlewareGroups;
   controllers?: IRegisterController[];
   custom?: {
      errorHandler?: IHandleError
   };

   [path: string]: any;
}

IExpress Type:

interface IExpress {
   use?: IExpressUse;
   set?: IExpressSet;

   [index: string]: any;
}

IMiddlewareGroups Type:

interface IMiddlewareGroups {
   [groupName: string]: IControllerArgs[];
}

IRegisterController Type:

interface IRegisterController extends IController {
}

IHandleError Type:

type IHandleError = (error: HttpError, request: Request, response: Response, next: NextFunction) => any

Methods

init:

Initialize the application and start the server

start:

Start the server

stop:

Stop the server

Controller

Types:

interface IController {
   routePrefix?: string;
   routeMiddlewareGroup?: string | string[];
   routeMiddlewares?: IControllerArgs | IControllerArgs[];

   routes(): IRoutes;
}

IControllerArgs Type:

type IControllerArgs = (request: Request, response: Response, next: NextFunction) => any

IRoutes Type:

interface IRoutes {
   all?: IRouteOption;
   get?: IRouteOption;
   post?: IRouteOption;
   put?: IRouteOption;
   patch?: IRouteOption;
   delete?: IRouteOption;
   options?: IRouteOption;
   head?: IRouteOption;
}

IRouteOption Type:

interface IRouteOption {
   [path: string]: IControllerArgs | IControllerArgs[]
}

Properties

routePrefix:

Set route path starting from

• @type: string | undefined
• @default: undefined

routeMiddlewareGroup:

Use the middleware pool registered at the configuration app for the entire controller route

• @type: string | string[] | undefined
• @default: undefined

routeMiddlewares:

Use middleware for the whole controller route

• @type: IControllerArgs | IControllerArgs[] | undefined
• @default: undefined

Methods:

routes:

Register the routes

• @return: IRoutes

Config

The config will be saved to the /.epts-engine/config.json file, the functions below only set the object, not save, if you want to save, use the save method after set, update and forget

Types:

interface IConfig {
   all(): object;

   has(key: IConfigKeyParam): boolean;

   get<T = IConfigValueReturn>(key: IConfigKeyParam, defaultValue: T): T;

   set<T = IConfigValueReturn>(key: string | object, value: T): IConfig;

   update<T = IConfigValueReturn>(key: IConfigKeyParam, updater: IConfigUpdater<T>): IConfig;

   forget(key: IConfigKeyParam): IConfig;

   save(): void;
}

IConfigKeyParam Type:

type IConfigKeyParam = string | string[]

IConfigValue Type:

type IConfigValue = IConfigKey | number | boolean

IConfigValueReturn Type:

type IConfigValueReturn = IConfigValue | IConfigValue[]

IConfigUpdater Type:

type IConfigUpdater<T = any> = (value: T) => T

Methods

get

Get configuration value

• @type: T default string
• @param:
  • name: key
  • type: string | string[]
• @param:
  • name: defaultValue
  • type: T
  • default: null
• @return: T

set

Create or replace configuration

• @type: T default string
• @param:
  • name: key
  • type: string | object
• @param:
  • name: value
  • type: T
• @return: IConfig

update

Update an existing configuration

• @type: T default string
• @param:
  • name: key
  • type: string | object
• @param:
  • name: updater
  • type: IConfigUpdater<T>
• @return: IConfig

has

Check the configuration exists

• @param
  • name: key
  • type: string | string[]
• @return: boolen

forget

Delete a configuration

• @param
  • name: key
  • type: string | string[]
• @return: boolen

Helper Methods

App

getRootDirectory

Get path from root directory

• rest @param:
  • name: path
  • type: string
• @return string

getEnv

Get the value configured in the environment variable

• @param:
  • name: key
  • type: string
• @param:
  • name: defaultValue
  • type: string | null
  • default: null
• @return: string

getUrl

Get path starting from url defined at app.url

• @param:
  • name: path
  • type: string | null
  • default: null
• @return: string | null

Configuration

The config will be saved to the /.epts-engine/config.json file, the functions below only set the object, not save, if you want to save, use the save method after updateConfig, setConfig and forgetConfig

getConfig

Get configuration value

• @type: T default string
• @param:
  • name: key
  • type: string | string[]
• @param:
  • name: defaultValue
  • type: T
  • default: null
• @return: T

Example:

import { getConfig } from '@pamstarter/epts-engine';

getConfig<string>('app.port') // return '3000'

setConfig

Create or replace configuration

• @type: T default string
• @param:
  • name: key
  • type: string | object
• @param:
  • name: value
  • type: T
• @return: IConfig

Example One:

import { setConfig } from '@pamstarter/epts-engine';

setConfig<number>('app.port', 4000) // return IConfig

Example Two:

import { setConfig } from '@pamstarter/epts-engine';

setConfig({
   app: {
      port: 4000
   }
})

Example for save:

import { setConfig } from '@pamstarter/epts-engine';

setConfig<number>('app.port', 4000).save() // return void

updateConfig

Update an existing configuration

• @type: T default string
• @param:
  • name: key
  • type: string | object
• @param:
  • name: updater
  • type: IConfigUpdater<T>
• @return: IConfig

Updater type:

type IConfigUpdater<T = any> = (value: T) => T

Example:

import { updateConfig } from '@pamstarter/epts-engine';

// port 3000
updateConfig<number>('app.port', (port => {
   return port + 1 // 3001 
})) // return IConfig

Example for save:

import { updateConfig } from '@pamstarter/epts-engine';

updateConfig<number>('app.port', (port /* 3000 */ => {
   return port + 1 // 3001 
})).save() // return IConfig

hasConfig

Check the configuration exists

• @param
  • name: key
  • type: string | string[]
• @return: boolen

Example:

import { hasConfig } from '@pamstarter/epts-engine';

/*
  {
     app: {
        port: 3000,
        url: 'http://localhost:3000'
     }
  }
*/

hasConfig('app.port') // true
hasConfig('app.bar') // false

forgetConfig

Delete a configuration

• @param
  • name: key
  • type: string | string[]
• @return: boolen

Example:

import { forgetConfig } from '@pamstarter/epts-engine';

/*
  {
     app: {
        port: 3000,
        url: 'http://localhost:3000',
     },
      foo: 'bar'
  }
*/

forgetConfig('foo')

Example for save:

import { forgetConfig } from '@pamstarter/epts-engine';

/*
  {
     app: {
        port: 3000,
        url: 'http://localhost:3000',
     },
      foo: 'bar'
  }
*/

forgetConfig('foo').save()

Router

wrapperRouteHandler

Wrapper route handler to use when you want to wrap multiple route handlers

• rest @param:
  • name: handlers
  • type: IRouteHandlerArgs
• @return: IRouteHandler

IRouteHandlerArgs type:

type IRouteHandlerArgs = (IControllerArgs | IControllerArgs[])[]

IRouteHandler type:

type IRouteHandler = IControllerArgs | IControllerArgs[]