library refactoring

lib/and.js

@@ -1,6 +1,6 @@
 'use strict';
 
-exports.and = () => {
+module.exports = () => {
   let state = 0; // idle
   let total = 0;
   let start = 0;
@@ -45,21 +45,3 @@ exports.and = () => {
     time: () => total + start
   };
 };
-
-
-exports.activity = skip => {
-  let start = 0;
-  let stop = 0;
-  return {
-    on: time => {
-      if (time > skip) {
-        if (start == 0) {
-          start = time;
-        } else {
-          stop = time;
-        }
-      }
-    },
-    time: () => stop - start
-  };
-};