diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..c01b6dd
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,12 @@
+[*]
+end_of_line = lf
+charset = utf-8
+indent_style = tab
+indent_size = 4
+guidelines = 120
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.js.cmd]
+end_of_line = crlf
+charset = shift_jis
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..0306ca2
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,2 @@
+* text=auto eol=lf encoding=utf-8
+*.js.cmd text eol=crlf encoding=sjis working-tree-encoding=sjis