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

Reference: https://github.com/angular/angular-cli/issues/17262

I found two solution

a ) Install babel compat

"devDependencies": {
    "@babel/compat-data": "7.8.0",
} 

b) Install plugin-proposal-numeric-separator

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

install this version only 7.8.0

2. Angular CLI can create this kind of issue. Go to package json and change it to

   build-angular": "0.803.17"

please don't add ^ or ~ .