# [Stephen Grider] Microservices with Node JS and React [ENG, 2020]

# 12. Code Sharing and Reuse Between Services

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### 01. Shared Logic Between Services

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![Application](/img/pic-12-01.png?raw=true)

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### 02. Options for Code Sharing

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![Application](/img/pic-12-02.png?raw=true)

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![Application](/img/pic-12-03.png?raw=true)

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### 03. NPM Organizations

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![Application](/img/pic-12-04.png?raw=true)

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npmjs --> create organization

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![Application](/img/pic-12-05.png?raw=true)

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### 04. Publishing NPM Modules

    $ cd app
    $ mkdir common
    $ cd common/
    $ npm init -y

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    $ git init
    $ git add .
    $ git commit -m "initial commit"

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    $ npm login
    $ npm publish --acces public

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### 05. Project Setup

    $ tsc --init
    $ npm install --save-dev typescript del-cli

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**tsconfig.json**

    "declaration": true
    "outDir": "./build"

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    $ npm run build

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### 06. An Easy Publish Command

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    $ npm version patch
    $ npm run build

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### 07. Relocating Shared Code

```
auth/src/errors copy to common/src/errors
auth/src/middlewares copy to common/src/middlewares
```

    $ npm install --save \
    express \
    express-validator \
    cookie-session \
    jsonwebtoken \
    @types/cookie-session \
    @types/express \
    @types/jsonwebtoken

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    $ tsc

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    $ npm run publish

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### 08. Updating Import Statements

    $ cd auth
    $ npm install --save @grider-ms-tickets/common

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### 09. Updating the Common Module

    $ cd auth
    $ npm update @grider-ms-tickets/common

---

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**Marley**

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