# NestJS v9 -> v10

The project was created with NestJS v9 and now it can be upgraded to v10. To achieve this using [ncu](https://www.npmjs.com/package/npm-check-updates), we should follow these steps:

* Install the latest node LTS version through nvm and activate it

```sh
nvm install lts
nvm use lts
```

* Install yarn (if you use it) and nest globally

```sh
npm i -g yarn @nestjs/cli
```

* Install ncu globally

```sh
npm i -g npm-check-updates
```

* Inside the project directory, use **ncu** to check available updates

```sh
ncu
```

* Update everything

```sh
ncu -u
```

* Change the **eslint** in <mark style="color:purple;">package.json</mark> back to v8, due to many breaking changes

```json
"eslint": "^8.0.0"
```

Then, we should update the <mark style="color:purple;">.gitignore</mark> file, by putting at the end of the <mark style="color:green;">#compiled output</mark> section:

```ignore
/build
```

And after the <mark style="color:green;"># IDE - VSCode</mark> section:

```ignore
# dotenv environment variable files
.env
.env.development.local
.env.test.local
.env.production.local
.env.local

# temp directory
.temp
.tmp

# Runtime data
pids
*.pid
*.seed
*.pid.lock

# Diagnostic reports (https://nodejs.org/api/report.html)
report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
```

In the <mark style="color:purple;">tsconfig.json</mark> file, alter the <mark style="color:blue;">target</mark> field to **ES2021**.

Finally, delete <mark style="color:purple;">yarn.lock</mark> and <mark style="color:purple;">node\_modules</mark>, and run <mark style="color:orange;">yarn</mark> to actually update the dependencies.

{% hint style="info" %}
If you are on **Windows** and want to switch the **line break** of your files back from LF to CRLF, you may perform the following steps:

* In the file <mark style="color:purple;">.prettierrc</mark>, set <mark style="color:blue;">`endOfLine`</mark> to <mark style="color:blue;">"crlf"</mark>
* In the terminal, run the following commands
  * <mark style="color:orange;">yarn format</mark>
  * <mark style="color:orange;">git config core.autocrlf true</mark>
* Set <mark style="color:blue;">`endOfLine`</mark> back to <mark style="color:blue;">"auto"</mark>
  {% endhint %}

<mark style="color:green;">**Commit**</mark> - Upgrading from NestJS v9 to v10


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