Environment

What version are you running? MAC.

@sentry/webpack-plugin 2.5.0

Steps to Reproduce

const { sentryWebpackPlugin } = require('@sentry/webpack-plugin')

new DefinePlugin({ 'process.env': envConfig })

I modified my process.env as follows when I configured sentryWebpackPlugin.
I found that in my JS code, process.env reported an error, process undefined

Expected Result

process.env Cannot be changed by plugins

What you thought would happen.

Actual Result

What actually happened. Maybe a screenshot/recording? Maybe some logs?