Attempted Import Error: 'default' Is Not Exported From '../assertThisInitialized/_index.mjs'

Suddenly my react is application throwing this error ./node_modules/@babel/runtime/helpers/esm/assertThisInitialized.js Attempted import error: 'default' is not exported from '../a

Solution 1:

Try specifying explicit versions of Babel and webpack

Use an older version of Babel Runtime 7.12.13 or older

Solution 2:

Work around . double click on the error file path to open the file. ./node_modules/@babel/runtime/helpers/esm/assertThisInitialized.js file and remove '/index.mjs' from the path .

export {default} from '../assertThisInitialized'

Solution 3:

I got the solution. Add "@babel/runtime@7.5.0" under resolutions in package.json to force babel-preset-react-app to use @babel/runtime@7.5.0

 "resolutions": {
    "**/@babel/runtime": "7.5.0"
  },