Add ignore option

README.md

@@ -8,8 +8,14 @@ Outputs the diff between two package.json dependencies
 ![](example.gif)
 
 ```bash
-npm i -g pkg-diff
-pkg-diff path/to/project-1 path/to/project-2
+$ npm i -g pkg-diff
+$ pkg-diff path/to/project-1 path/to/project-2
+```
+
+If you want to ignore any dependency type you can use `--ignore`.
+
+```bash
+$ pkg-diff --ignore=peer,optional path/to/project-1 path/to/project-2
 ```
 
 ## License

package.json

@@ -25,7 +25,8 @@
   "dependencies": {
     "babel-runtime": "^6.20.0",
     "chalk": "^1.1.3",
-    "diff": "^3.2.0"
+    "diff": "^3.2.0",
+    "minimist": "^1.2.0"
   },
   "devDependencies": {
     "ava": "^0.17.0",

src/getDependencies.js

@@ -4,13 +4,13 @@ function resolvePath (path) {
   return /package.json$/.test(path) ? resolve(path) : resolve(path, 'package.json')
 }
 
-export default function getDependencies (path) {
+export default function getDependencies (path, ignore = '') {
   const pkg = require(resolvePath(path))
-  const dependencies = [
-    pkg.dependencies,
-    pkg.devDependencies,
-    pkg.peerDependencies,
-    pkg.optionalDependencies
-  ]
-  return Object.assign({}, ...dependencies)
+
+  return {
+    ...(ignore.includes('dep')      ? {} : pkg.dependencies),
+    ...(ignore.includes('dev')      ? {} : pkg.devDependencies),
+    ...(ignore.includes('peer')     ? {} : pkg.peerDependencies),
+    ...(ignore.includes('optional') ? {} : pkg.optionalDependencies)
+  }
 }

src/index.js

@@ -1,11 +1,14 @@
 #!/usr/bin/env node --harmony
+import minimist from 'minimist'
 import getDependencies from './getDependencies'
 import getDiff from './getDiff'
 import createMessage from './createMessage'
 
+const argv = minimist(process.argv.slice(2))
+
 const deps = getDiff(
-  getDependencies(process.argv[2]),
-  getDependencies(process.argv[3])
+  getDependencies(argv._[0], argv.ignore),
+  getDependencies(argv._[1], argv.ignore)
 )
 
 deps.map(createMessage).forEach(msg => console.log(msg))

test/getDependencies.js

@@ -12,13 +12,33 @@ test('returns with all valid dependencies', t => {
     dep4: '4.0.0'
   }
 
+  t.deepEqual(getDependencies(pkgPath), expected)
+  t.deepEqual(getDependencies(projectPath), expected)
+})
+
+test('ignores specified dependencies', t => {
+  const dep      = { dep1: '1.0.0' }
+  const dev      = { dep2: '2.0.0' }
+  const peer     = { dep3: '3.0.0' }
+  const optional = { dep4: '4.0.0' }
+
+  t.deepEqual(
+    getDependencies(projectPath, 'dep'),
+    { ...dev, ...peer, ...optional }
+  )
+
+  t.deepEqual(
+    getDependencies(projectPath, 'dev'),
+    { ...dep, ...peer, ...optional }
+  )
+
   t.deepEqual(
-    getDependencies(pkgPath),
-    expected
+    getDependencies(projectPath, 'peer'),
+    { ...dep, ...dev, ...optional }
   )
 
   t.deepEqual(
-    getDependencies(projectPath),
-    expected
+    getDependencies(projectPath, 'optional'),
+    { ...dep, ...dev, ...peer }
   )
 })