Could not find plugin “proposal-numeric-separator”

Question

How to fix Could not find plugin \"proposal-numeric-separator\", I get this error when I try to build my React application, I have not ejected the application y

Answer 1

From the corresponding issue in create-react-app,

Update react-scripts to 3.4.1 in your package.json file and remove node_modules as well as package-lock.json/yarn.lock and re-install.

Answer 2

try this , this working with me .

npm i @babel/compat-data@7.8.0

Answer 3

I just changed react-script version from 3.0.1 to 3.4.1

Answer 4

In my angular 8 application, although I did not have any direct dependancy of react-scripts package and did not have it in package.json either but started getting this error on build. It was likely used as a depedancy by other packges.

By reading this post on github, I added it as dependancy in package.json "react-scripts": "3.4.1" and run npm install the build started working just fine.

Answer 5

The following steps work:

1. Add the following line to package.json:

"resolutions": { 
  "@babel/preset-env": "7.5.5" 
},

2. Run the following command:

$ npx npm-force-resolutions

3. Install dependencies:

$ npm install
# or 
$ yarn

4. Build your project:

$ yarn build

Take a look at this Github Issue

Answer 6

Its just a 4 step process.

Reason: This happens because of a package missing in babel. This will happen even if you create angular app using ng new command.

Solution

1. Install plugin-proposal-numeric-separator using the following code in terminal.

   npm install --save @babel/plugin-proposal-numeric-separator
   

2. Once it is done navigate to the file as shown below.

   node_modules > @babel > preset-env > available-plugins.js

3. In available-plugins.js below exports.default = void 0; copy and paste the following code.

   var _pluginProposalNumericSeparator = _interopRequireDefault(require("@babel/plugin-proposal-numeric-separator"));
   

4. In available-plugins.js within var _default object declaration copy and paste the following code.

   "proposal-numeric-separator": _pluginProposalNumericSeparator.default,
   

And it is done.