This repository was archived by the owner on Sep 11, 2025. It is now read-only.
This repository was archived by the owner on Sep 11, 2025. It is now read-only.
Not Able to Use jest-playwright-preset in Playwright Docker Container #793
Description
Describe the bug
The jest-playwright-preset package, when used in a playwright docker container, leads to TypeError: Class extends value #<Object> is not a constructor or null. It started to happen to me yesterday as all my CI tests are failing due to this error. I am not sure whether jest-playwright-preset or the playwright Docker image is contributing to this behavior.
To Reproduce
Use this minimal Docker file:
FROM mcr.microsoft.com/playwright:v1.21.0-focal
WORKDIR /app
RUN npm install jest-playwright-preset
CMD node -e "const { globalSetup: playwrightGlobalSetup } = require('jest-playwright-preset')"Build the image and run it: docker build -t app . && docker run --rm app
Expected behavior
The following error message appeared:
/app/node_modules/jest-playwright-preset/lib/PlaywrightEnvironment.js:59
return class PlaywrightEnvironment extends RootEnv {
^
TypeError: Class extends value #<Object> is not a constructor or null
at Object.getPlaywrightEnv (/app/node_modules/jest-playwright-preset/lib/PlaywrightEnvironment.js:59:48)
at Object.<anonymous> (/app/node_modules/jest-playwright-preset/lib/PlaywrightEnvironment.js:242:27)
at Module._compile (node:internal/modules/cjs/loader:1103:14)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1157:10)
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> (/app/node_modules/jest-playwright-preset/index.js:1:18)
at Module._compile (node:internal/modules/cjs/loader:1103:14)Desktop (please complete the following information):
- OS: Ubuntu
- Playwright version: 1.21.0
- jest-playwright version: 1.7.0