feat: add bin command

bin/index.js

@@ -0,0 +1,10 @@
+#!/usr/bin/env node
+const inspect = require('../dist/index')
+
+inspect.buildDepTreeFromFiles('./', 'package.json', 'package-lock.json')
+  .then((tree) => {
+    console.log(JSON.stringify(tree));
+  })
+  .catch((e) => {
+    console.log(e);
+  });

package.json

@@ -2,6 +2,9 @@
   "name": "snyk-nodejs-lockfile-parser",
   "description": "Generate a dep tree given a lockfile",
   "main": "dist/lib/index.js",
+  "bin": {
+    "parse": "./bin/index.js"
+  },
   "scripts": {
     "test": "npm run lint && npm run unit-test",
     "unit-test": "tap test/lib -R=spec --timeout=300 --node-path ts-node --test-file-pattern '/\\.[tj]s$/'",

test/lib/index.ts

@@ -3,9 +3,9 @@
 // See: https://github.com/tapjs/node-tap/issues/313#issuecomment-250067741
  // tslint:disable:max-line-length
 // tslint:disable:object-literal-key-quotes
-import { test } from 'tap';
+import {test} from 'tap';
 import * as sinon from 'sinon';
-import parseLockFile from '../../lib';
+import {buildDepTreeFromFiles} from '../../lib';
 import * as fs from 'fs';
 
 const load = (filename) => fs.readFileSync(
@@ -14,7 +14,7 @@ const load = (filename) => fs.readFileSync(
 test('Parse npm package-lock.json', async (t) => {
   const expectedDepTree = load('goof/dep-tree_small.json');
 
-  const depTree = await parseLockFile(
+  const depTree = await buildDepTreeFromFiles(
     `${__dirname}/fixtures/goof/`,
     'package.json',
     'package-lock.json',