Migrate back to CommonJS export for jest-runtime

Author: rubennorte

packages/jest-cli/src/__tests__/SearchSource.test.js

@@ -31,7 +31,7 @@ describe('SearchSource', () => {
   let searchSource;
 
   beforeEach(() => {
-    Runtime = require('jest-runtime').default;
+    Runtime = require('jest-runtime');
     SearchSource = require('../SearchSource').default;
     normalize = require('jest-config').normalize;
   });

packages/jest-resolve-dependencies/src/__tests__/dependency_resolver.test.js

@@ -23,7 +23,7 @@ const cases = {
 const filter = path => Object.keys(cases).every(key => cases[key](path));
 
 beforeEach(() => {
-  Runtime = require('jest-runtime').default;
+  Runtime = require('jest-runtime');
   config = normalize(
     {
       rootDir: '.',

packages/jest-runner/src/runTest.js

@@ -73,7 +73,7 @@ async function runTestInternal(
   const Runtime = ((config.moduleLoader
     ? /* $FlowFixMe */
       require(config.moduleLoader)
-    : require('jest-runtime').default): Class<RuntimeClass>);
+    : require('jest-runtime')): Class<RuntimeClass>);
 
   let runtime = undefined;
 

packages/jest-runtime/src/index.js

@@ -1017,4 +1017,4 @@ class Runtime {
 
 Runtime.ScriptTransformer = ScriptTransformer;
 
-export default Runtime;
+module.exports = Runtime;