don't ignore the src/

Author: rpearce

.gitignore

@@ -60,5 +60,4 @@ typings/
 # next.js build output
 .next
 
-src/
 *.tmp

src/index.js

@@ -0,0 +1,30 @@
+'use strict'
+
+// flexibleStringReplace :: (Pattern, Replacement, String) -> [ * ]
+// Pattern = RegExp | String
+// Replacement = String | (* -> *)
+function flexibleStringReplace(pattern, replacement, str) {
+  var result = []
+  var position = 0
+
+  str.replace(pattern, function() {
+    var args = Array.prototype.slice.call(arguments)
+    var argsN = args.length
+    var match = args[0]
+    var originalStr = args[argsN - 1]
+    var charOffset = args[argsN - 2]
+    var prevChars = originalStr.slice(position, charOffset)
+    var replaced = typeof replacement === 'function'
+      ? replacement.apply(null, args)
+      : replacement
+
+    result.push(prevChars, replaced)
+    position = charOffset + match.length
+  })
+
+  result.push(str.slice(position))
+
+  return result
+}
+
+module.exports = flexibleStringReplace