diff --git a/packages/contract-artifacts/test/contract_artifacts_test.ts b/packages/contract-artifacts/test/contract_artifacts_test.ts
index 89690e6a29..cdf6160f62 100644
--- a/packages/contract-artifacts/test/contract_artifacts_test.ts
+++ b/packages/contract-artifacts/test/contract_artifacts_test.ts
@@ -1,14 +1,17 @@
 import * as chai from 'chai';
-import { get } from 'lodash';
+import {get} from 'lodash';
 import 'mocha';
 
 import * as artifacts from '../src/index';
 
-import { ObjectMap } from '../../types/lib';
-import { FORBIDDEN_PROPERTIES, REQUIRED_PROPERTIES } from '../src/transform';
+import {FORBIDDEN_PROPERTIES, REQUIRED_PROPERTIES} from '../src/transform';
 
 const expect = chai.expect;
 
+interface ObjectMap<T> {
+    [name: string]: T;
+}
+
 // For pure functions, we use local EVM execution in `@0x/base-contract` instead
 // of making an eth_call. This requires the `deployedBytecode` from compiler output.
 const CONTRACTS_WITH_PURE_FNS = [
@@ -24,7 +27,7 @@ const CONTRACTS_WITH_PURE_FNS = [
 
 describe('Contract Artifacts', () => {
     it('should not include forbidden attributes', () => {
-        const forbiddenPropertiesByArtifact: { [name: string]: string[] } = {};
+        const forbiddenPropertiesByArtifact: {[name: string]: string[]} = {};
         for (const [artifactName, artifact] of Object.entries(artifacts)) {
             for (const forbiddenProperty of FORBIDDEN_PROPERTIES) {
                 const rejectedValue = get(artifact, forbiddenProperty);