diff --git a/src/Asset.js b/src/Asset.js
index 79812e3eab9..e08758baee0 100644
--- a/src/Asset.js
+++ b/src/Asset.js
@@ -125,7 +125,7 @@ class Asset {
 
   async getPackage() {
     if (!this._package) {
-      this._package = await this.getConfig(['package.json']);
+      this._package = await this.resolver.findPackage(path.dirname(this.name));
     }
 
     return this._package;
diff --git a/src/packagers/JSConcatPackager.js b/src/packagers/JSConcatPackager.js
index 89fe42d0889..1e060f5ac2b 100644
--- a/src/packagers/JSConcatPackager.js
+++ b/src/packagers/JSConcatPackager.js
@@ -141,8 +141,8 @@ class JSConcatPackager extends Packager {
     this.addedAssets.add(asset);
     let {js} = asset.generated;
 
-    // If the asset's package has the sideEffects: false flag set, and there are no used
-    // exports marked, exclude the asset from the bundle.
+    // If the asset has no side effects according to the its package's sideEffects flag,
+    // and there are no used exports marked, exclude the asset from the bundle.
     if (
       asset.cacheData.sideEffects === false &&
       (!asset.usedExports || asset.usedExports.size === 0)
diff --git a/src/scope-hoisting/hoist.js b/src/scope-hoisting/hoist.js
index b1e34ddcef3..d9ebfca19cc 100644
--- a/src/scope-hoisting/hoist.js
+++ b/src/scope-hoisting/hoist.js
@@ -1,4 +1,6 @@
+const path = require('path');
 const matchesPattern = require('../visitors/matches-pattern');
+const mm = require('micromatch');
 const t = require('babel-types');
 const template = require('babel-template');
 const rename = require('./renamer');
@@ -28,14 +30,32 @@ const TYPEOF = {
   require: 'function'
 };
 
+function hasSideEffects(asset, {sideEffects} = asset._package) {
+  switch (typeof sideEffects) {
+    case 'undefined':
+      return true;
+    case 'boolean':
+      return sideEffects;
+    case 'string':
+      return mm.isMatch(
+        path.relative(asset._package.pkgdir, asset.name),
+        sideEffects,
+        {matchBase: true}
+      );
+    case 'object':
+      return sideEffects.some(sideEffects =>
+        hasSideEffects(asset, {sideEffects})
+      );
+  }
+}
+
 module.exports = {
   Program: {
     enter(path, asset) {
       asset.cacheData.imports = asset.cacheData.imports || Object.create(null);
       asset.cacheData.exports = asset.cacheData.exports || Object.create(null);
       asset.cacheData.wildcards = asset.cacheData.wildcards || [];
-      asset.cacheData.sideEffects =
-        asset._package && asset._package.sideEffects;
+      asset.cacheData.sideEffects = asset._package && hasSideEffects(asset);
 
       let shouldWrap = false;
       path.traverse({
diff --git a/test/graphql.js b/test/graphql.js
index ed6eacc93af..b532006994a 100644
--- a/test/graphql.js
+++ b/test/graphql.js
@@ -31,7 +31,6 @@ describe('graphql', function() {
           firstName
           lastName
         }
-
       `.definitions
     );
   });
diff --git a/test/integration/scope-hoisting/es6/side-effects-array/a.js b/test/integration/scope-hoisting/es6/side-effects-array/a.js
new file mode 100644
index 00000000000..d07f8414fae
--- /dev/null
+++ b/test/integration/scope-hoisting/es6/side-effects-array/a.js
@@ -0,0 +1,3 @@
+import {foo} from 'bar';
+
+output = foo(2);
diff --git a/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/bar.js b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/bar.js
new file mode 100644
index 00000000000..0e5ae1cab45
--- /dev/null
+++ b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/bar.js
@@ -0,0 +1,5 @@
+sideEffect('bar');
+
+export default function bar() {
+  return 2;
+}
diff --git a/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/foo.js b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/foo.js
new file mode 100644
index 00000000000..ed9bdb2fa3f
--- /dev/null
+++ b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/foo.js
@@ -0,0 +1,5 @@
+sideEffect('foo');
+
+export default function foo(a) {
+  return a * a;
+}
diff --git a/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/index.js b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/index.js
new file mode 100644
index 00000000000..f9e940c9f6a
--- /dev/null
+++ b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/index.js
@@ -0,0 +1,2 @@
+export foo from './foo';
+export bar from './bar';
diff --git a/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/package.json b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/package.json
new file mode 100644
index 00000000000..10a6720860d
--- /dev/null
+++ b/test/integration/scope-hoisting/es6/side-effects-array/node_modules/bar/package.json
@@ -0,0 +1,4 @@
+{
+  "name": "bar",
+  "sideEffects": ["./foo.js"]
+}
diff --git a/test/scope-hoisting.js b/test/scope-hoisting.js
index e88c70ab191..1815b333eaa 100644
--- a/test/scope-hoisting.js
+++ b/test/scope-hoisting.js
@@ -281,6 +281,22 @@ describe('scope hoisting', function() {
       assert.deepEqual(output, 'bar');
     });
 
+    it('supports the package.json sideEffects flag with an array', async function() {
+      let b = await bundle(
+        __dirname + '/integration/scope-hoisting/es6/side-effects-array/a.js'
+      );
+
+      let calls = [];
+      let output = await run(b, {
+        sideEffect: caller => {
+          calls.push(caller);
+        }
+      });
+
+      assert(calls.toString() == 'foo', "side effect called for 'foo'");
+      assert.deepEqual(output, 4);
+    });
+
     it('missing exports should be replaced with an empty object', async function() {
       let b = await bundle(
         __dirname + '/integration/scope-hoisting/es6/empty-module/a.js'