Problem with css modules when one component using several times in one page

[AndreyFedarovich]

Bug report

Problem with css modules when one component using several times in one page

When one component used several times in one page, in chrome dev tools we can see that styles was generated several times also (only for production mode)

To Reproduce

Steps to reproduce the behavior:

1. Use css-modules
2. Use one component several times per page

Expected behavior

css generated only one time, like for development mode

Screenshots

System information

• OS: [macOS]
• all
• Version of Next.js: 9
• Version of Node.js: 10

[AndreyFedarovich]

Found the same issue: #11448. Hope my details can help to fix it

[timneutkens]

Duplicate of #11448

[balazsorban44]

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