diff --git a/CHANGELOG.md b/CHANGELOG.md
index 09d9a4ff6785..26b428a56e06 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ### Features
 
+* `[jest-config]` Export Jest's default options
+  ([#5948](https://github.com/facebook/jest/pull/5948))
 * `[jest-editor-support]` Move `coverage` to `ProjectWorkspace.collectCoverage`
   ([#5929](https://github.com/facebook/jest/pull/5929))
 * `[jest-editor-support]` Add `coverage` option to runner
diff --git a/docs/Configuration.md b/docs/Configuration.md
index 9ddead5d548c..10ef341fcd07 100644
--- a/docs/Configuration.md
+++ b/docs/Configuration.md
@@ -44,6 +44,20 @@ These options let you control Jest's behavior in your `package.json` file. The
 Jest philosophy is to work great by default, but sometimes you just need more
 configuration power.
 
+### Defaults
+
+You can retrieve Jest's default options to expand them if needed:
+
+```js
+// jest.config.js
+const {defaults} = require('jest-config');
+module.exports = {
+  // ...
+  moduleFileExtensions: [...defaults.moduleFileExtensions, 'ts', 'tsx'],
+  // ...
+};
+```
+
 <AUTOGENERATED_TABLE_OF_CONTENTS>
 
 ---
diff --git a/packages/jest-config/src/__tests__/defaults.test.js b/packages/jest-config/src/__tests__/defaults.test.js
new file mode 100644
index 000000000000..bfd3a833e445
--- /dev/null
+++ b/packages/jest-config/src/__tests__/defaults.test.js
@@ -0,0 +1,5 @@
+import {defaults} from '../index';
+
+test('get configuration defaults', () => {
+  expect(defaults).toBeDefined();
+});
diff --git a/packages/jest-config/src/index.js b/packages/jest-config/src/index.js
index 88afaedfb6c4..2d61877849c7 100644
--- a/packages/jest-config/src/index.js
+++ b/packages/jest-config/src/index.js
@@ -25,6 +25,7 @@ export {getTestEnvironment, isJSONString} from './utils';
 export {default as normalize} from './normalize';
 export {default as deprecationEntries} from './deprecated';
 export {replaceRootDirInPath} from './utils';
+export {default as defaults} from './defaults';
 
 export function readConfig(
   argv: Argv,