1. Warning

$ eslint tray/tray_sub.js
Warning: React version not specified in eslint-plugin-react settings. See https://github.com/yannickcr/eslint-plugin-react#configuration .

/home/wsd02/PrivateInvoice/817r/modules/tray/tray_sub.js
   24:18  error  'require' is not defined  no-undef
   28:16  error  'require' is not defined  no-undef
   29:12  error  'require' is not defined  no-undef
  338:1   error  'module' is not defined   no-undef

2. ‘require’ is not defined no-undef

    "env": {
        "browser": true,
        "es2021": true,
        "node": true <-- add
    },

3. Warning: React version not specified in eslint-plugin-react settings

    "extends": [
        "eslint:recommended",
        //"plugin:react/recommended" <-- del
    ],

4. .eslintrc.js

module.exports = {
    "env": {
        "browser": true,
        "es2021": true,
        "node": true
    },
    "extends": [
        "eslint:recommended",
        //"plugin:react/recommended"
    ],
    "parserOptions": {
        "ecmaFeatures": {
            "jsx": true
        },
        "ecmaVersion": "latest",
        "sourceType": "module"
    },
    "plugins": [
        "react"
    ],
    "rules": {
    }
}