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Add moduleNameMapper ordering note to the documentation #5249

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Jan 8, 2018
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Add moduleNameMapper ordering note to the documentation #5249

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efc0cb6
Add moduleNameMapper ordering note to the documentation
emileber Jan 8, 2018
0215ed4
Add changelog entry
emileber Jan 8, 2018
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -38,6 +38,7 @@

* `[docs]` Describe the order of execution of describe and test blocks.
([#5217](https://github.com/facebook/jest/pull/5217), [#5238](https://github.com/facebook/jest/pull/5238))
* `[docs]` Add a note on `moduleNameMapper` ordering. ([#5249](https://github.com/facebook/jest/pull/5249))

## jest 22.0.4

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3 changes: 3 additions & 0 deletions docs/Configuration.md
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Expand Up @@ -386,6 +386,9 @@ Example:
}
```

The order in which the mappings are defined matters. Patterns are checked one
by one until one fits. The most specific rule should be listed first.

_Note: If you provide module name without boundaries `^$` it may cause hard to
spot errors. E.g. `relay` will replace all modules which contain `relay` as a
substring in its name: `relay`, `react-relay` and `graphql-relay` will all be
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