diff --git a/lib/utils.ts b/lib/get-node-runtime-version.ts
similarity index 55%
rename from lib/utils.ts
rename to lib/get-node-runtime-version.ts
index 56510b5c..010f58ce 100644
--- a/lib/utils.ts
+++ b/lib/get-node-runtime-version.ts
@@ -1,4 +1,4 @@
 
-export function getRuntimeVersion(): number {
+export default function getRuntimeVersion(): number {
   return parseInt(process.version.slice(1).split('.')[0], 10);
 }
diff --git a/lib/index.ts b/lib/index.ts
index 2ad54bd3..5158ccf8 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -2,10 +2,10 @@ import 'source-map-support/register';
 import * as fs from 'fs';
 import * as path from 'path';
 import {LockfileParser, Lockfile, ManifestFile, PkgTree,
-  DepType, parseManifestFile} from './parsers/parser';
+  DepType, parseManifestFile} from './parsers';
 import {PackageLockParser} from './parsers/package-lock-parser';
 import {YarnLockParser} from './parsers/yarn-lock-parse';
-import {getRuntimeVersion} from './utils';
+import getRuntimeVersion from './get-node-runtime-version';
 
 enum LockfileType {
   npm = 'npm',
diff --git a/lib/parsers/parser.ts b/lib/parsers/index.ts
similarity index 84%
rename from lib/parsers/parser.ts
rename to lib/parsers/index.ts
index a53cc410..e6dc6561 100644
--- a/lib/parsers/parser.ts
+++ b/lib/parsers/index.ts
@@ -36,16 +36,12 @@ export enum DepType {
 }
 
 export interface LockfileParser {
-  parseLockFile: parseLockFile;
-  getDependencyTree: getDependencyTree;
+  parseLockFile: (lockFileContents: string)
+      => Lockfile;
+  getDependencyTree: (manifestFile: ManifestFile, lockfile: Lockfile, includeDev?: boolean)
+      => Promise<PkgTree>;
 }
 
-export type parseLockFile = (lockFileContents: string)
-    => Lockfile;
-
-export type getDependencyTree = (manifestFile: ManifestFile, lockfile: Lockfile, includeDev?: boolean)
-    => Promise<PkgTree>;
-
 export type Lockfile = PackageLock | YarnLock;
 
 export function parseManifestFile(manifestFileContents: string): ManifestFile {
diff --git a/lib/parsers/package-lock-parser.ts b/lib/parsers/package-lock-parser.ts
index 79bdab52..6a2afff5 100644
--- a/lib/parsers/package-lock-parser.ts
+++ b/lib/parsers/package-lock-parser.ts
@@ -1,6 +1,6 @@
 import * as _ from 'lodash';
 import {LockfileParser, PkgTree, Dep, DepType, ManifestFile,
-  getTopLevelDeps} from './parser';
+  getTopLevelDeps} from './';
 
 export interface PackageLock {
   name: string;
diff --git a/lib/parsers/yarn-lock-parse.ts b/lib/parsers/yarn-lock-parse.ts
index 097f1f3f..c84f990a 100644
--- a/lib/parsers/yarn-lock-parse.ts
+++ b/lib/parsers/yarn-lock-parse.ts
@@ -1,6 +1,6 @@
 import * as _ from 'lodash';
 import {LockfileParser, PkgTree, Dep, DepType, ManifestFile,
-  getTopLevelDeps} from './parser';
+  getTopLevelDeps} from './';
 import getRuntimeVersion from '../get-node-runtime-version';
 
 export interface YarnLock {
diff --git a/test/lib/yarn.ts b/test/lib/yarn.ts
index bbc49796..a67dbf77 100644
--- a/test/lib/yarn.ts
+++ b/test/lib/yarn.ts
@@ -5,7 +5,7 @@
 // tslint:disable:object-literal-key-quotes
 import {test} from 'tap';
 import {buildDepTreeFromFiles} from '../../lib';
-import {getRuntimeVersion} from '../../lib/utils';
+import getRuntimeVersion from '../../lib/get-node-runtime-version';
 import * as fs from 'fs';
 import * as _ from 'lodash';