Add moduleNameMapper ordering note to the documentation (#5249)

emileber · cpojer · commit 105c25e01a95 · 2018-01-08T17:00:21.000Z
* Add moduleNameMapper ordering note to the documentation

* Add changelog entry
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -40,6 +40,7 @@
 
 * `[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
 
diff --git a/docs/Configuration.md b/docs/Configuration.md
@@ -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

Original file line number	Diff line number	Diff line change
`@@ -386,6 +386,9 @@ Example:`
`386`	`386`	`}`
`387`	`387`	```
`388`	`388`
	`389`	`+The order in which the mappings are defined matters. Patterns are checked one`
	`390`	`+by one until one fits. The most specific rule should be listed first.`
	`391`	`+`
`389`	`392`	_Note: If you provide module name without boundaries `^$` it may cause hard to
`390`	`393`	spot errors. E.g. `relay` will replace all modules which contain `relay` as a
`391`	`394`	substring in its name: `relay`, `react-relay` and `graphql-relay` will all be