fix bug when script has the same name as the target os script

package.json

@@ -1,6 +1,6 @@
 {
   "name": "cross-os",
-  "version": "1.1.0",
+  "version": "1.1.1",
   "description": "Allow to add OS-specific scripts in your package.json!",
   "main": "source/index.js",
   "bin": "source/index.js",

source/index.ts

@@ -18,7 +18,7 @@ const pipeline = new Promise(resolve => {
     let script = process.argv.pop(),
         property = 'scripts';
 
-    if (config[property] && !config[property][script]) {
+    if (!config[property][script] || typeof config[property][script] !== 'object') {
         property = 'cross-os'
     }
 

test/package.json

@@ -9,14 +9,20 @@
     "third": "echo 'it is working just fine'",
     "fourth": "node ../source/index.js first",
     "sixth": "node ../source/index.js first",
-    "seventh": "node ../source/index.js fifth"
+    "seventh": "node ../source/index.js fifth",
+    "foo": "node ../source/index.js foo"
   },
   "cross-os": {
     "fifth": {
       "win32": "echo hello from cross-os win32",
       "linux": "echo hello from cross-os linux",
       "darwin": "echo hello from cross-os darwin"
     },
-    "sixth": "echo i should not been seen"
+    "sixth": "echo i should not been seen",
+    "foo": {
+      "win32": "echo bar from win32",
+      "linux": "echo bar from linux",
+      "darwin": "echo bar from darwin"
+    }
   }
 }

test/test.ts

@@ -108,4 +108,22 @@ describe('Loader', () => {
 
     })
 
+    it('should not conflict with script containing the same name as its callee', done => {
+
+        const child = exec('npm run foo --silent')
+
+        let output = '';
+
+        child.stdout.on('data', (buffer: Buffer) => {
+            output += buffer.toString('utf-8')
+        })
+
+        child.on('exit', code => {
+            expect(output.trim()).to.match(/bar/)
+            expect(code).to.be(0)
+            done()
+        })
+
+    })
+
 })