diff --git a/test/e2e/tree-shaking-flow/fixture/.fusionrc.js b/test/e2e/tree-shaking-flow/fixture/.fusionrc.js
new file mode 100644
index 00000000..dabf00db
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/.fusionrc.js
@@ -0,0 +1,3 @@
+module.exports = {
+  assumeNoImportSideEffects: true
+};
diff --git a/test/e2e/tree-shaking-flow/fixture/.gitignore b/test/e2e/tree-shaking-flow/fixture/.gitignore
new file mode 100644
index 00000000..59085114
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/.gitignore
@@ -0,0 +1,2 @@
+!node_modules
+.fusion_babel_cache/
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js
new file mode 100644
index 00000000..919d27d6
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js
@@ -0,0 +1,11 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+const usedDependencyValue = '__FIXTURE_DEPENDENCY_USED__';
+
+const unusedDependencyValue = '__FIXTURE_DEPENDENCY_UNUSED__';
+
+exports.usedDependencyValue = usedDependencyValue;
+exports.unusedDependencyValue = unusedDependencyValue;
+//# sourceMappingURL=index.js.map
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js.flow b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js.flow
new file mode 100644
index 00000000..a1b699a4
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js.flow
@@ -0,0 +1,3 @@
+// @flow
+
+export * from "../src/index.js";
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js.map b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js.map
new file mode 100644
index 00000000..618669b9
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/dist/index.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"index.js","sources":["../src/used.js","../src/unused.js"],"sourcesContent":["// @flow\nexport type UsedDependencyType = {|shouldBeUsed: string|};\nexport type UsedDependencyOtherType = {|alsoShouldBeUsed: string|};\n\nexport const usedDependencyValue = '__FIXTURE_DEPENDENCY_USED__';\n","// @flow\nexport type UnusedDependencyType = {|shouldBeUnused: string|};\nexport type UnusedDependencyOtherType = {|alsoShouldBeUnused: string|};\n\nexport const unusedDependencyValue = '__FIXTURE_DEPENDENCY_UNUSED__';\n"],"names":["usedDependencyValue","unusedDependencyValue"],"mappings":";;;;AAIO,MAAMA,mBAAmB,GAAG,6BAA5B;;ACAA,MAAMC,qBAAqB,GAAG,+BAA9B;;;;;"}
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/package.json b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/package.json
new file mode 100644
index 00000000..b52f4cf0
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/package.json
@@ -0,0 +1,5 @@
+{
+  "name": "fixture-es2017-pkg",
+  "version": "1.0.0",
+  "main": "./dist/index.js"
+}
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/index.js b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/index.js
new file mode 100644
index 00000000..3afcba44
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/index.js
@@ -0,0 +1,3 @@
+// @flow
+export * from './used.js';
+export * from './unused.js';
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/unused.js b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/unused.js
new file mode 100644
index 00000000..ae104fe7
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/unused.js
@@ -0,0 +1,5 @@
+// @flow
+export type UnusedDependencyType = {|shouldBeUnused: string|};
+export type UnusedDependencyOtherType = {|alsoShouldBeUnused: string|};
+
+export const unusedDependencyValue = '__FIXTURE_DEPENDENCY_UNUSED__';
diff --git a/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/used.js b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/used.js
new file mode 100644
index 00000000..22185bc9
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/node_modules/fixture-pkg/src/used.js
@@ -0,0 +1,5 @@
+// @flow
+export type UsedDependencyType = {|shouldBeUsed: string|};
+export type UsedDependencyOtherType = {|alsoShouldBeUsed: string|};
+
+export const usedDependencyValue = '__FIXTURE_DEPENDENCY_USED__';
diff --git a/test/e2e/tree-shaking-flow/fixture/src/main.js b/test/e2e/tree-shaking-flow/fixture/src/main.js
new file mode 100644
index 00000000..d2ace9e1
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/src/main.js
@@ -0,0 +1,59 @@
+// @flow
+
+/* Includes type imports from both node_modules and userland but as
+ * standalone type imports and mixed imports:
+ *    import type {AType, BType} from ...
+ *    import {type AType, type BType, C, D} from ...
+ */
+
+// Import only types from dependency
+import type {
+  UnusedDependencyType,
+  UsedDependencyType,
+} from 'fixture-pkg';
+
+// Import mixed types and values from dependency
+import {
+  type UnusedDependencyOtherType,
+  type UsedDependencyOtherType,
+  unusedDependencyValue,
+  usedDependencyValue
+} from 'fixture-pkg';
+
+// Import only types from userland
+import type {
+  UnusedUserlandType,
+  UsedUserlandType
+} from './user-code.js';
+
+// Import mixed types and values from userland
+import {
+  type UnusedUserlandOtherType,
+  type UsedUserlandOtherType,
+  unusedUserlandValue,
+  usedUserlandValue
+} from './user-code.js';
+
+if (__NODE__) {
+  // unused in the browser
+  //  - node modules
+  const unusedDepVal: UnusedDependencyType = { shouldBeUnused: unusedDependencyValue };
+  const unusedDepVal2: UnusedDependencyOtherType = { alsoShouldBeUnused: unusedDependencyValue };
+  //  - userland
+  const unustedUserlandVal: UnusedUserlandType = { shouldBeUnused: unusedUserlandValue };
+  const unustedUserlandVal2: UnusedUserlandOtherType = { alsoShouldBeUnused: unusedUserlandValue };
+
+  console.log(unusedDepVal, unusedDepVal2, unustedUserlandVal, unustedUserlandVal2);
+}
+
+// used in the browser
+//  - node modules
+const usedDepVal: UsedDependencyType = { shouldBeUsed: usedDependencyValue};
+const usedDepVal2: UsedDependencyOtherType = { alsoShouldBeUsed: usedDependencyValue};;
+//  - userland
+const usedUserlandVal: UsedUserlandType = { shouldBeUsed: usedUserlandValue};
+const usedUserlandVal2: UsedUserlandOtherType = { alsoShouldBeUsed: usedUserlandValue};;
+
+console.log(usedDepVal, usedDepVal2, usedUserlandVal, usedUserlandVal2);
+
+export default () => {};
diff --git a/test/e2e/tree-shaking-flow/fixture/src/unused2.js b/test/e2e/tree-shaking-flow/fixture/src/unused2.js
new file mode 100644
index 00000000..d51def8c
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/src/unused2.js
@@ -0,0 +1,5 @@
+// @flow
+export type UnusedUserlandType = {| shouldBeUnused: string |};
+export type UnusedUserlandOtherType = {| alsoShouldBeUnused: string |};
+
+export const unusedUserlandValue = '__FIXTURE_USERLAND_UNUSED__';
diff --git a/test/e2e/tree-shaking-flow/fixture/src/used2.js b/test/e2e/tree-shaking-flow/fixture/src/used2.js
new file mode 100644
index 00000000..c04bac52
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/src/used2.js
@@ -0,0 +1,5 @@
+// @flow
+export type UsedUserlandType = {| shouldBeUsed: string |};
+export type UsedUserlandOtherType = {| alsoShouldBeUsed: string |};
+
+export const usedUserlandValue = '__FIXTURE_USERLAND_USED__';
diff --git a/test/e2e/tree-shaking-flow/fixture/src/user-code.js b/test/e2e/tree-shaking-flow/fixture/src/user-code.js
new file mode 100644
index 00000000..ad2cf29a
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/fixture/src/user-code.js
@@ -0,0 +1,3 @@
+// @flow
+export * from './used2.js';
+export * from './unused2.js';
diff --git a/test/e2e/tree-shaking-flow/test.js b/test/e2e/tree-shaking-flow/test.js
new file mode 100644
index 00000000..a14c31e1
--- /dev/null
+++ b/test/e2e/tree-shaking-flow/test.js
@@ -0,0 +1,43 @@
+// @flow
+/* eslint-env node */
+
+const t = require('assert');
+const path = require('path');
+const fs = require('fs');
+const {promisify} = require('util');
+
+const readdir = promisify(fs.readdir);
+
+const dir = path.resolve(__dirname, './fixture');
+
+const {cmd} = require('../utils.js');
+
+test('`fusion build` strips unused types in dev and correctly tree shakes remaining imports w/ assumeNoImportSideEffects: true', async () => {
+  await cmd(`build --dir=${dir}`);
+
+  const distFolder = path.resolve(dir, '.fusion/dist/development/client');
+  const clientFiles = await readdir(distFolder);
+
+  clientFiles
+    .filter(file => path.extname(file) === '.js')
+    .map(file => path.join(distFolder, file))
+    .forEach(file => {
+      const unusedChecks = [
+        // userland
+        'UnusedUserlandType',
+        'UnusedUserlandOtherType',
+        '__FIXTURE_USERLAND_UNUSED__',
+        // node modules
+        'UnusedDependencyType',
+        'UnusedDependencyOtherType',
+        '__FIXTURE_DEPENDENCY_UNUSED__',
+      ];
+
+      unusedChecks.forEach(name => {
+        t.ok(
+          !fs.readFileSync(file, 'utf-8').includes(name),
+          `should not include unused export in browser: ${name}`
+        );
+      });
+    });
+}, 100000);