From eca323480f4f448cdefac0f459b9edb8fcd0d1fd Mon Sep 17 00:00:00 2001
From: Anthony Astige <astige@fb.com>
Date: Wed, 10 Jul 2019 09:26:40 -0700
Subject: [PATCH] Issue 8547: side effect import deps extracted

ed4edd890 -> red
965a24c04 -> green
c4bbbba26 -> Refinement
---
 CHANGELOG.md                                   |  1 +
 .../lib/__tests__/dependencyExtractor.test.js  | 18 ++++++++++++++++++
 .../src/lib/dependencyExtractor.ts             |  2 +-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c57e8fc17c7..bc746212bc31 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@
 
 ### Fixes
 
+- `[jest-cli]` Detect side-effect only imports when running `--onlyChanged` or `--changedSince` ([#8670](https://github.com/facebook/jest/pull/8670))
 - `[jest-cli]` Allow `--maxWorkers` to work with % input again ([#8565](https://github.com/facebook/jest/pull/8565))
 - `[babel-plugin-jest-hoist]` Expand list of whitelisted globals in global mocks ([#8429](https://github.com/facebook/jest/pull/8429)
 - `[jest-core]` Make watch plugin initialization errors look nice ([#8422](https://github.com/facebook/jest/pull/8422))
diff --git a/packages/jest-haste-map/src/lib/__tests__/dependencyExtractor.test.js b/packages/jest-haste-map/src/lib/__tests__/dependencyExtractor.test.js
index e13ed50c735f..9fb6d117309d 100644
--- a/packages/jest-haste-map/src/lib/__tests__/dependencyExtractor.test.js
+++ b/packages/jest-haste-map/src/lib/__tests__/dependencyExtractor.test.js
@@ -17,6 +17,7 @@ describe('dependencyExtractor', () => {
       // require('ignore-line-comment');
       /*
        * import a from 'ignore-block-comment';
+       * import './ignore-block-comment';
        * require('ignore-block-comment');
        */
     `;
@@ -67,6 +68,23 @@ describe('dependencyExtractor', () => {
     expect(extract(code)).toEqual(new Set(['dep1', 'dep2', 'dep3', 'dep4']));
   });
 
+  // https://github.com/facebook/jest/issues/8547
+  // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#Import_a_module_for_its_side_effects_only
+  it('should extract dependencies from side-effect only `import` statements', () => {
+    const code = `
+        // Good
+        import './side-effect-dep1';
+        import 'side-effect-dep2';
+
+        // Bad
+        import ./inv1;
+        import inv2
+      `;
+    expect(extract(code)).toEqual(
+      new Set(['./side-effect-dep1', 'side-effect-dep2']),
+    );
+  });
+
   it('should not extract dependencies from `import type/typeof` statements', () => {
     const code = `
       // Bad
diff --git a/packages/jest-haste-map/src/lib/dependencyExtractor.ts b/packages/jest-haste-map/src/lib/dependencyExtractor.ts
index 2335e30d6b69..d1aa4445ff3c 100644
--- a/packages/jest-haste-map/src/lib/dependencyExtractor.ts
+++ b/packages/jest-haste-map/src/lib/dependencyExtractor.ts
@@ -54,7 +54,7 @@ const REQUIRE_OR_DYNAMIC_IMPORT_RE = createRegExp(
 
 const IMPORT_OR_EXPORT_RE = createRegExp(
   [
-    '\\b(?:import|export)\\s+(?!type(?:of)?\\s+)[^\'"]+\\s+from\\s+',
+    '\\b(?:import|export)\\s+(?!type(?:of)?\\s+)(?:[^\'"]+\\s+from\\s+)?',
     CAPTURE_STRING_LITERAL(1),
   ],
   'g',