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

In package.json

  "dependencies": {
    "@babel/compat-data": "7.8.0",
    "@babel/plugin-proposal-numeric-separator": "^7.8.3",
    "babel-loader": "^8.1.0",
  ....
  "resolutions": {
     "@babel/preset-env": "^7.8.7"
  }

it is working for me. You can read more

https://github.com/angular/angular-cli/issues/17262#issuecomment-603396857

Answer 2

You can use this command, which has worked for me.

npm i @babel/compat-data@7.8.0

Answer 3

This worked for me:

• Delete package-lock.json
• Delete node_modules
• Run npm i

Answer 4

I'm using angular & this worked for me, simply changed the version of @babel/compat-data from ^7.8.0 to just 7.8.0, the package-lock.json is having newer version which has bugs.

Inside package.json:

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

Answer 5

Add SKIP_PREFLIGHT_CHECK=true to .env file to make the build work without ejecting and follow the below steps:

• Delete node_modules and package-lock.json
• Add "resolutions": { "@babel/preset-env": "^7.8.7" } to package.json
• Run npm install npm-force-resolutions --save-dev
• Run npm install
• Run npx npm-force-resolutions
• Run npm install again
• Run npm run build

Answer 6

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 ~ .