create-react-app: Cannot create build: TypeError: Ajv is not a constructor

Steps To Reproduce

Update to latest react-scripts (5.0.0)
Do npm run build.

The current behavior

home/node/frontend/node_modules/mini-css-extract-plugin/node_modules/schema-utils/dist/validate.js:66
const ajv = new Ajv({
            ^
TypeError: Ajv is not a constructor
    at Object.<anonymous> (/home/node/frontend/node_modules/mini-css-extract-plugin/node_modules/schema-utils/dist/validate.js:66:13)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:11[55](https://firelight.smokescreen.io/v4/frontend/-/jobs/95213#L55):10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:1005:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/home/node/frontend/node_modules/mini-css-extract-plugin/node_modules/schema-utils/dist/index.js:6:5)
    at Module._compile (node:internal/modules/cjs/loader:1103:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1155:10)

About this issue

Original URL
State: open
Created 2 years ago
Reactions: 20
Comments: 15

Most upvoted comments

I got this fixed after uninstalling npm-force-resolutions and removing all preinstall related to that. And then

rm -rf node_modules
rm package-lock.json
npm install

+14

vishnusajev on Apr 28, 2022

Same issue here. Sometimes it works and sometimes it doesn’t.

Also happens on npm run start for me

pgrones on Mar 30, 2022

This is very painful, every time you add a new dependency you have to rm -rf node_modules and install it again.

Any updates on this are very much appreciated 🙏

ferdelamad on Feb 10, 2023