# 3 Things You Didn’t Know About Yarn — Liran Tal

Everyone talk about Yarn’s speed and reliability but no one mentions any of the below nice-to-know facts about Yarn.

Canonical: https://lirantal.com/blog/3-things-you-didnt-know-about-yarn-877416ac40c3

![](/images/blog/1__1PdacXrzbm0A1vxX0Jglrw.jpeg)

Everyone talk about Yarn’s speed and reliability but no one mentions any of the below nice-to-know facts about Yarn.

### 1\. Yarn Depends on npm

Well guess what? Yarn’s source code actually depends on npm to be present because it uses it to run it’s own npm run-scripts which help build the Yarn package itself:

![](/images/blog/0__b2wlcwGIgoyDRm28.png)

### 2\. Yarn Style

Yarn coding convention is all about 2 space indentations, semicolons, and actually extending what seems to be Facebook’s own JavaScript coding conventions:

eslint-config-fb-strict

Surprise surprise, Yarn developers also use Flow extensively.

### 3\. Built-In Spellcheck

Yarn is so much user-friendly that it’s developers added a functionality to automatically detect possible typos which are classic for the ‘dependencies’ clause.

Say we init a new npm module:

![](/images/blog/0__MpiHFtDzqw9oiYy9.png)

And then we deliberately add a typo for the dependencies clause as such:

{
“name”: “test”,
“version”: “1.0.0”,
“main”: “index.js”,
“license”: “MIT”,
“dependancies”: {
“express”: ”\*”
}
}

Running Yarn will produce the following:

![](/images/blog/0__XNePQv9__2x2sE43u.png)

Nice huh? This is thanks to the following source code for Yarn that does it’s best to help you out when in need:

![](/images/blog/0__dgYwdfyJpSuTWYSE.png)

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* * *

Liran Tal is the author of the book [Node.js Secure Coding: Defending Against Command Injection Vulnerabilities](https://www.nodejs-security.com/)

[Start Building Secure Node.js Applications ↗](https://www.nodejs-security.com/)

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