How To Fix - "Error: Node Sass version 5.0.0 is incompatible with ^4.0.0." ?

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In this post, we will explore How To Fix - Error: Node Sass version 5.0.0 is incompatible with ^4.0.0. . While using React you get the following error in this scenario -

Failed to compile.
Error: Node Sass version 5.0.0 is incompatible with ^4.0.0.<!-- more -->

Other formats of the same error based on other versions -

Failed to compile.
Error: Node Sass version 6.0.0 is incompatible with ^4.0.0. || ^5.0.0.

Module build failed (from ./node\_modules/sass-loader/lib/loader.js):
Error: Node Sass version 6.0.0 is incompatible with ^4.0.0.

Node Sass version 7.0.0 is incompatible with ^4.0.0 || ^5.0.0 || ^6.0.0

Node Sass version 6.0.1 is incompatible with ^4.0.0 || ^5.0.0.

 

Primitive Checks:

I assume you have installed or setup some or all of the below components(some version of those)

• Npm
• Node.js
• React
• Node-sass ( or LibSaas - Deprectaed from 2020)
• Sass
• Yarn

The obvious cross-check to be done is the compatibility between Node.js & Node-sass version for your setup. Refer the below list taken from - https://www.npmjs.com/package/node-sass. Use the Latest version preferrably. (PS - Be aware that - Node-sass or LibSass was deprecated from October 26 2020. As an alternative, you are advised to use Sass or Dart Sass (https://sass-lang.com/dart-sass))

NodeJS

Supported node-sass version

Node Module

Node 17

7.0+

102

Node 16

6.0+

93

Node 15

5.0+, <7.0

88

Node 14

4.14+

83

Node 13

4.13+, <5.0

79

Node 12

4.12+

72

Node 11

4.10+, <5.0

67

Node 10

4.9+, <6.0

64

Node 8

4.5.3+, <5.0

57

Node <8

<5.0

<57

  Refer this table for the version compatibility. e.g. If you are using Node.js version-17 on your system, then use the appropriate node-sass version-7.0

npm install [email protected]

This practice will tick of the first step in the right direction.

Quick Solution:

Be aware that - Node-sass or LibSass was deprecated from October 26 2020. As an alternative, you are advised to use Sass or Dart Sass (https://sass-lang.com/dart-sass) Quick solution is to remove Node-saas and use Saas instead.

• Remove Node-sass

yarn remove node-sass

OR

npm uninstall node-sass

• Install Sass

yarn add -D sass

OR

npm i -D sass

If the above doesn't fix your error, we will go in a more detailed approach to handle error. Follow along the steps.  

Step 1 :

Be aware that - Node-sass or LibSass was deprecated from October 26 2020. Hence you are advised to directly follow Step2. BUT  for some reason, if you still need to use Node-saas, then follow along these Step 1 process.

• Remove node_modules directory
• Remove lock file package-lock.json

For npm use - 

Remove package-lock.json

For yarn use -

Remove yarn.json

• Install the Right Dependent Node-saas version ( as per above table)

npm uninstall node-sass
npm install node-sass@VERSION\_NO

• Start The Build or Rebuild for your Project.

   

Step 2 :

Be aware that - Node-sass or LibSass was deprecated from October 26 2020. As an alternative, you are advised to use Sass or Dart Sass (https://sass-lang.com/dart-sass) If you are using NPM as Package Manager, use the below steps -

• Uninstall Node-sass

npm uninstall node-sass

• Uninstall Sass-loader

npm uninstall sass-loader

• Install Sass

npm install sass --save-dev

OR

npm install -g sass
npm install --save-dev sass

NOTE: Use --save-dev in Dev environment - Otherwise avoid it.

• Restart the Node Server

  If you are using Yarn as Package Manager, use the below steps -

• Delete the Yarn.lock file for the project
• Uninstall Node-sass

yarn remove node-sass

• Uninstall Sass-loader

yarn remove sass-loader

• Install Sass

yarn add sass

• Restart the Server

  Hopefully by now, sass is installed for you. As a next step,

• Go to your "Package.json" file.
• Add below . This is because React might still look for Node-sass. So we are replacing (Alias) with "Sass". So now react will use sass henceforth.

"node-sass": "npm:sass@^**X.Y.Z**" ( X.Y.Z USE YOUR SAAS VERSION NO)

"devDependencies": { "node-sass": "^a.b.c", "sass-loader": "^**X.Y.Z**" } (X.Y.Z USE YOUR SAAS VERSION NO)

Once you are done with the above steps, go ahead with the Build process.

• Remove node_modules directory
• Remove lock file

For npm use - 

Remove package-lock.json

For yarn use -

Remove yarn.json

• Start The Build or Rebuild for your Project.

  Hopefully your issue is resolved by now.  

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