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Notes

Class-1

yarn init -y
git init

yarn add typescript tsconfig-paths -D
yarn tsc --init
# Convert TS to JS
yarn tsc

yarn add prettier eslint eslint-config-prettier @typescript-eslint/eslint-plugin @typescript-eslint/parser -D
yarn eslint --init

yarn add express
# Some libraries have a separate library with available types
yarn add @types/express -D

# Auto convert TS to JS
yarn add ts-node-dev -D
yarn dev

Requisition Types

  • GET => get information
  • POST => insert information
  • PUT => change information
  • DELETE => remove information
  • PATCH => change specific information

Class-2

yarn add typeorm reflect-metadata sqlite3

yarn typeorm -help
yarn typeorm migration:create -n CreateUsers
yarn typeorm migration:run
yarn typeorm migration:revert

yarn add uuid
yarn add @types/uuid -D

yarn typeorm entity:create -n User -d src/user/entity

Types of Parameters

Migrations

It would be a way to version changes in the database, like a git for the database

TypeORM

  • Entity (User) <-> ORM (repositories) <-> BD

Application Flow

-> Server -> Routes -> Controller -> Service -> Repositories -> BD

Class-3

yarn add express-async-errors

Middleware

app.use is used to add middlewares

  • express.json: enable json on requests
  • router: add routes

middleware to handle error needs 4 parameters, others need only 3

Class-4

yarn add jsonwebtoken
yarn add @types/jsonwebtoken -D

yarn typeorm migration:create -n AlterUsersAddPassword
yarn typeorm migration:run

yarn add bcryptjs
yarn add @types/bcryptjs -D

Class-5

yarn add class-transformer
yarn add cors
yarn add @types/cors -D

Async/await

Functions that will need to call another function with await need to be declared as async

Functions that return a Promise need to be called with await

Clean Architecture

One of the rules would be to separate CRUD operations (create, read, update, delete) into different services instead of grouping all operations related to an entity in a single file

Heroku

sudo snap install --classic heroku
heroku login
heroku apps
heroku git:remote -a your_app_name
heroku run bash
npx typeorm migration:show
npx typeorm migration:run

Config Vars

TYPEORM_ENTITIES = dist/entities/*.js

TYPEORM_MIGRATIONS = dist/database/migrations/*.js