Introduced .hgignore.
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..3a18683
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+node_modules/
+package-lock.json
+/build/
+/Makefile
diff --git a/.hgignore b/.hgignore
new file mode 100644
index 0000000..ef1b797
--- /dev/null
+++ b/.hgignore
@@ -0,0 +1,4 @@
+/node_modules/
+package-lock.json
+^build/
+^Makefile$