diff --git a/.gitignore b/.gitignore
index 5148e52..bc7fc55 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@ npm-debug.log*
 pids
 *.pid
 *.seed
+*.pid.lock
 
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
@@ -33,5 +34,11 @@ jspm_packages
 # Optional npm cache directory
 .npm
 
+# Optional eslint cache
+.eslintcache
+
 # Optional REPL history
 .node_repl_history
+
+# Output of 'npm pack'
+*.tgz