diff --git a/packages/labs/src/grpc_web/change_import_style.js b/packages/labs/src/grpc_web/change_import_style.js
index f1a285d93e..e9c0e753b6 100644
--- a/packages/labs/src/grpc_web/change_import_style.js
+++ b/packages/labs/src/grpc_web/change_import_style.js
@@ -13,6 +13,7 @@
  */
 const minimist = require('minimist');
 const fs = require('fs');
+const path = require('path');
 
 function main() {
   const args = minimist(process.argv.slice(2));
@@ -119,20 +120,36 @@ function convertToESM(args, initialContents) {
   const replaceRequiresWithImports = (contents) => {
     return contents
         .replace(
-            /var ([\w\d_]+) = require\((['"][\.\\]*[\w\d@/_-]+['"])\)/g, 'import * as $1 from $2')
+            /var ([\w\d_]+) = require\(['"]([\.\\]*[\w\d@/_-]+)['"]\)/g,
+            (_, variable, importPath) => {
+              if (importPath.startsWith(args.workspace_name)) {
+                importPath = `./${path.relative(args.input_base_path, importPath)}`;
+              }
+              return `import * as ${variable} from '${importPath}';`
+            })
         .replace(
-            /([\.\w\d_]+) = require\((['"][\.\w\d@/_-]+['"])\)/g, (_, variable, importPath) => {
+            /([\.\w\d_]+) = require\(['"]([\.\w\d@/_-]+)['"]\)/g, (_, variable, importPath) => {
+              if (importPath.startsWith(args.workspace_name)) {
+                importPath = `./${path.relative(args.input_base_path, importPath)}`;
+              }
+
               const normalizedVariable = variable.replace(/\./g, '_');
-              return `import * as ${normalizedVariable} from ${importPath};\n${variable} = {...${
+              return `import * as ${normalizedVariable} from '${importPath}';\n${variable} = {...${
                   normalizedVariable}}`;
             });
   };
 
-  const replaceRequiresWithSubpackageImports = (contents) => {
-    return contents.replace(
-        /var ([\w\d_]+) = require\((['"][\w\d@/_-]+['"])\)\.([\w\d_]+);/g,
-        'import * as $1 from $2;');
-  };
+  const replaceRequiresWithSubpackageImports =
+      (contents) => {
+        return contents.replace(
+            /var ([\w\d_]+) = require\(['"]([\w\d@/_-]+)['"]\)\.([\w\d_]+);/g,
+            (_, variable, importPath) => {
+              if (importPath.startsWith(args.workspace_name)) {
+                importPath = `./${path.relative(args.input_base_path, importPath)}`;
+              }
+              return `import * as ${variable} from '${importPath}';`
+            });
+      }
 
   const replaceCJSExportsWithECMAExports = (contents) => {
     return contents.replace(/exports\.([\w\d_]+) = .*;/g, 'export { $1 };');
diff --git a/packages/labs/test/grpc_web/BUILD.bazel b/packages/labs/test/grpc_web/BUILD.bazel
index f993f91121..c0df73e520 100644
--- a/packages/labs/test/grpc_web/BUILD.bazel
+++ b/packages/labs/test/grpc_web/BUILD.bazel
@@ -81,11 +81,8 @@ karma_web_test_suite(
 rollup_bundle(
     name = "test_es6_bundling",
     config_file = "rollup.config.js",
-    entry_points = {
-        ":test_bundling.ts": "index",
-    },
+    entry_point = ":test_bundling.ts",
     format = "cjs",
-    output_dir = True,
     deps = [
         ":test_bundling_lib",
         "@npm//rollup-plugin-commonjs",
@@ -105,12 +102,22 @@ ts_library(
     ],
 )
 
+ts_library(
+    name = "rollup_test_lib",
+    testonly = 1,
+    srcs = ["rollup_test.spec.ts"],
+    deps = [
+        "@npm//@types/jasmine",
+        "@npm//@types/node",
+    ],
+)
+
 jasmine_node_test(
     name = "rollup_test",
-    srcs = [
-        ":rollup_test.spec.js",
-    ],
     data = [
         ":test_es6_bundling",
     ],
+    deps = [
+        ":rollup_test_lib",
+    ],
 )
diff --git a/packages/labs/test/grpc_web/commonjs_test.spec.ts b/packages/labs/test/grpc_web/commonjs_test.spec.ts
index e49d23e71c..1ae0fbf68f 100644
--- a/packages/labs/test/grpc_web/commonjs_test.spec.ts
+++ b/packages/labs/test/grpc_web/commonjs_test.spec.ts
@@ -1,5 +1,5 @@
-import deliveryPersonPb = require('build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/common/delivery_person_pb');
-import {PizzaServiceClient} from 'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/pizza_service_grpc_web_pb';
+import deliveryPersonPb = require('./proto/common/delivery_person_pb');
+import {PizzaServiceClient} from './proto/pizza_service_grpc_web_pb';
 
 describe('CommonJs', () => {
   it('Loads imports using require()', () => {
diff --git a/packages/labs/test/grpc_web/pizza_service_proto_test.spec.ts b/packages/labs/test/grpc_web/pizza_service_proto_test.spec.ts
index 9fa649a54f..183b846443 100644
--- a/packages/labs/test/grpc_web/pizza_service_proto_test.spec.ts
+++ b/packages/labs/test/grpc_web/pizza_service_proto_test.spec.ts
@@ -1,8 +1,8 @@
 import 'google-protobuf';
 
-import {Pizza, PizzaSize} from 'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/common/pizza_pb';
-import {PizzaServiceClient} from 'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/pizza_service_grpc_web_pb';
-import {OrderPizzaRequest, OrderPizzaResponse} from 'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/pizza_service_pb';
+import {Pizza, PizzaSize} from './proto/common/pizza_pb';
+import {PizzaServiceClient} from './proto/pizza_service_grpc_web_pb';
+import {OrderPizzaRequest, OrderPizzaResponse} from './proto/pizza_service_pb';
 
 declare function require(module: string): any;
 
@@ -27,8 +27,7 @@ describe('DeliveryPerson', () => {
   });
 
   it('delivery_person_ts_proto is included since it is a transitive dependency', () => {
-    const PROTOS = require(
-        'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/common/delivery_person_pb');
+    const PROTOS = require('./proto/common/delivery_person_pb');
     const DeliveryPerson = PROTOS.DeliveryPerson;
     const pizza = new Pizza();
     pizza.setSize(PizzaSize.PIZZA_SIZE_LARGE);
diff --git a/packages/labs/test/grpc_web/rollup_test.spec.js b/packages/labs/test/grpc_web/rollup_test.spec.ts
similarity index 82%
rename from packages/labs/test/grpc_web/rollup_test.spec.js
rename to packages/labs/test/grpc_web/rollup_test.spec.ts
index ae0bf36661..1ee2d9a58d 100644
--- a/packages/labs/test/grpc_web/rollup_test.spec.js
+++ b/packages/labs/test/grpc_web/rollup_test.spec.ts
@@ -1,16 +1,14 @@
 const grpcWeb = require('grpc-web');
 grpcWeb.MethodType = {
-  UNARY: 'unary'
+  UNARY: 'unary',
 };
-const bundle = require('build_bazel_rules_nodejs/packages/labs/test/grpc_web/test_es6_bundling/');
+const bundle = require('./test_es6_bundling');
 
 describe('Rollup', () => {
   it('should define Pizza with protobuf API', () => {
     expect(bundle.Pizza).toBeDefined();
-
     const pizza = new bundle.Pizza();
     pizza.setSize(bundle.PizzaSize.PIZZA_SIZE_LARGE);
-
     expect(pizza.getSize()).toBe(bundle.PizzaSize.PIZZA_SIZE_LARGE);
     expect(Array.isArray(pizza.getToppingIdsList())).toBe(true);
   });
diff --git a/packages/labs/test/grpc_web/test_bundling.ts b/packages/labs/test/grpc_web/test_bundling.ts
index f8cb156b0b..96aafb885f 100644
--- a/packages/labs/test/grpc_web/test_bundling.ts
+++ b/packages/labs/test/grpc_web/test_bundling.ts
@@ -1,2 +1,2 @@
-export {DeliveryPerson} from 'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/common/delivery_person_pb';
-export {Pizza, PizzaSize} from 'build_bazel_rules_nodejs/packages/labs/test/grpc_web/proto/common/pizza_pb';
+export {DeliveryPerson} from './proto/common/delivery_person_pb';
+export {Pizza, PizzaSize} from './proto/common/pizza_pb';