Dawn of NodeTS API

Understanding NodeTS API with MSSQL from its dawn. This project highlights the initial setup for NodeTS API with MSSQL as data source. An architectural setup of NodeTS API.

Initialize NPM

npm init

Install Typescript Compiler Globally

npm i -g typescript

Typescript Initialize

tsc --init

Updating TS Configuration

1. Update target from "es5" to "es6"
2. Update the outDir from './' to './dist' which will contains the compiled JS files
3. Update the rootDir from './' to './src' which will contains TS files
4. Uncomment moduleResolution to "node"

{
    "compilerOptions": {
        "target": "es6",
        "outDir": "./dist",
        "rootDir": "./src",
        "moduleResolution": "node"
    }
}

Install Express

Run the following command to install express as dependencies

npm i express 
npm i mssql 
npm i dotenv 
npm i compression 
npm i cors 
npm i winston
npm i uuid
npm i jsonwebtoken
npm i cache-manager
npm i cache-manager-fs

Install Dev Dependencies

Run the following command to install typescript, ts-node, nodemon, @types/node, @types/express and @types/mssql as dev dependency (we don't need these for production we need it for development)

npm i -D typescript 
npm i -D ts-node-dev 
npm i -D @types/node 
npm i -D @types/express 
npm i -D @types/mssql 
npm i -D @types/cors 
npm i -D @types/compression
npm i -D @types/uuid
npm i -D @types/jsonwebtoken
npm i -D @types/cache-manager

The -D above is for dev-dependencies.

Update Package JSON Script

Update the package.json script command as follows:

"scripts": {
    "start": "node dist/server",
    "build": "tsc -p .",
    "watch": "ts-node-dev --respawn --transpile-only ./src/server.ts"
}

Unit Testing using JEST

For unit testing and test coverage we are using JEST framework. Install following dev dependencies for JEST.

npm i -D jest @types/jest ts-jest

Initialize your jest with:

jest --init

Do following changes in jest.config.js file

module.exports = {
  clearMocks: true,
  coverageDirectory: "./test-results/coverage",
  coverageReporters: [
    "json",
    "text",
    "lcov",
    "clover"
  ],
  globals: {
    "ts-jest": {
      tsConfig: "tsconfig.json"
    }
  },
  moduleFileExtensions: [
    "js",
    "ts"
  ],
  testEnvironment: "node",
  testMatch: [
    "**/src/**/*.spec.(ts)"
  ],
  transform: {
    "^.+\\.(ts|tsx)$": "ts-jest"
  },
};

Name your unit test files as "*.spec.ts".

The command is created to run JEST is in package.json so you have to simply run:

npm test
// or
npm t

The command in package.json is as follows:

jest --forceExit --coverage --verbose --detectOpenHandles

Overview of JEST

To simply run your jest unit test cases execute following command:

jest

The above will show high level detail of the executed or not executed test suits.

Verbose: Will provide details of each individual test cases.

jest --verbose

Coverage: Will provide code coverage. JEST by default uses istanbul to show test coverage reports.

jest --coverage

Linting Setup

For linting we are using tslint. Install following dev dependencies for linting.

npm i -D tslint

Add the tslint.json lint configuration file as follows:

{
    "defaultSeverity": "error",
    "extends": [
        "tslint:recommended"
    ],
    "jsRules": {},
    "rules": {},
    "rulesDirectory": []
}