don't let source-map-support use xhr - 25-75% speed improvement (#5045)

* don't let source-map-support use xhr * Update CHANGELOG.md * Update CHANGELOG.md
jestjs · Dec 11, 2017 · 34bd3bb · 34bd3bb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ### Fixes
 
+* `[jest-jasmine]` Register sourcemaps as node environment to improve performance with jsdom ([#5045](https://github.com/facebook/jest/pull/5045))
 * `[pretty-format]` Do not call toJSON recursively
   ([#5044](https://github.com/facebook/jest/pull/5044))
 * `[pretty-format]` Fix errors when identity-obj-proxy mocks CSS Modules

diff --git a/packages/jest-jasmine2/src/index.js b/packages/jest-jasmine2/src/index.js
@@ -115,6 +115,7 @@ async function jasmine2(
   runtime
     .requireModule(require.resolve('source-map-support'), 'source-map-support')
     .install({
+      environment: 'node',
       handleUncaughtExceptions: false,
       retrieveSourceMap: source => {
         if (runtime._sourceMapRegistry[source]) {