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elc

The best practice of building Koa2 with TypeScript.

Usage

  1. Run npm init elc

  2. Install dependencies: yarn

  3. fill out .env.dev, and run prisma db push to synchronize the data model

  4. Start the server: yarn dev. visit: http://127.0.0.1:3001/api/user/list

Project Layout

src
├── app
│   ├── controllers         ---  server controllers
│   ├── helpers             ---  helper func (database / redis / interceptor / error handler / validator...)
│   ├── jobs                ---  task (periodic task / trigger task / email server...)
│   └── services            ---  adhesive controller and model
├── config
│   ├── constants        ---  environment variable
│   ├── koa.middlewares     ---  middlewares for Koa
│   ├── routing.middlewares ---  middlewares for Routing Controller
│   ├── routing.options     ---  configs for Routing Controller
│   ├── bootstrap           ---  lifecycle
│   └── interceptors        ---  global interceptor
│   └── utils               ---  pure functions for help
└── test                    ---  utils for testcase
├── .env           ---  environment file

Feature

  • Separation configuration and business logic.

  • Test cases and lint configuration.

  • The best practice for Dependency Injection in Koa project.

  • Get constraints on your data model with Prisma.

  • TypeScript hotload.

Lifecycle

  1. app.ts -> collect env vars constants -> collect env files variables.env

  2. envs ready, call bootstrap.before()

  3. lift routing-controllers -> lift Koa middlewares -> register Container for DI

  4. start Koa & invoke bootstrap.after() after startup

Databases

The project uses Prisma as the intelligent ORM tool by default. Supports PostgreSQL, MySQL and SQLite.

  • You can change the data type and connection method in the .env file
  • After each modification to file /prisma/schema.prisma, you need to run prisma migrate dev to migrate the database.
  • After each modification to file /prisma/schema.prisma, you need to run prisma generate to sync types.

About Environments

When nodejs is running, ENV does not mean NODE_ENV:

  • After NodeJS project is built, we always run it as NODE_ENV=PRODUCTION, which may affect some framework optimizations.
  • NODE_ENV only identifies the NodeJS runtime, independent of the business.
  • You should use ENV to identify the environment.

For the data settings of each environment, you can refer to the following:

  • Development Mode (ENV=development): read configurations from configs/constants/development.ts file, but it will still be overwritten by .env file.

  • Production Mode (ENV=production): read configurations from configs/constants/production.ts file, but it will still be overwritten by .env file.

Reference

LICENSE

This project is licensed under the MIT License. See the LICENSE file for more info.