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Update README.md (fixes #125) #131

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Apr 1, 2018
Merged

Update README.md (fixes #125) #131

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Update README.md (fixes #125)
dfrankland Mar 24, 2018
40c1d7e
Update README.md (fixes #125)
dfrankland Mar 25, 2018
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7 changes: 7 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@ Table of Contents
* [Preact](#preact)
* [toHaveStyleRule](#tohavestylerule)
* [Global installation](#global-installation)
* [Working with multiple packages](#working-with-multiple-packages)
* [Contributing](#contributing)

# Snapshot Testing
Expand Down Expand Up @@ -369,6 +370,12 @@ And import the library once in the `setupTest.js` as follows:
import 'jest-styled-components'
```

# Working with multiple packages

If Jest Styled Components is not working, it is likely caused by loading multiple instances of `styled-components`. This can happen especially when working with a Lerna monorepo. Starting with `styled-components@3.2.0`, a warning will be logged when multiple instances of it are being included and run as part of the Jest tests. Using `styled-components@3.1.6` and lower with multiple instances will cause a silent error with unexpected results.

To debug and fix multiple instances of `styled-components` see the FAQ on ["Why am I getting a warning about several instances of module on the page?"](https://www.styled-components.com/docs/faqs#why-am-i-getting-a-warning-about-several-instances-of-module-on-the-page).

# Contributing

Please [open an issue](https://github.com/styled-components/jest-styled-components/issues/new) and discuss with us before submitting a PR.