error message

Support for the experimental syntax ‘decorators-legacy’ isn’t currently enab

Install mobx and report an error when using the decorator

Cause: the current decorator is not recognized

Solution: install the related package to make the code identify the decorator

Method: modify JSON and install related plug-ins

Create react app creates a new project package JSON will not be displayed and needs to be run

Display the configuration file. This operation is irreversible

npm run eject

If the report is wrong

Remove untracked files, stash or commit any changes, and try again.
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] eject: `react-scripts eject`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the [email protected] eject script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

The main problem is that scaffolding is added Gitgnore file, but there is no local warehouse. If it is a git managed package, the following steps are not required

We need to add our project to the local warehouse, open the project folder with git, and then run the following command:

git init
git add .
git commit -m 'comment out'

Found package json

"babel": {
    "plugins": [
      [
        "@babel/plugin-proposal-decorators",
        {
          "legacy": true
        }
      ]
    ],
    "presets": [
      "react-app"
    ]
  },

Rerun project

Done!