Could not find plugin "proposal-numeric-separator" in angular app

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It work's for me

Step 1: add in in your devDependencies: "@babel/compat-data": "7.8.0"

Step 2: run - npm install

Thanks to nicolo-ribaudo from issue8680

Adding the dependency @babel/compat-data": "7.8.0" fixed the issue for me.

vi package.json

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

npm install

ng build --prod

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