initial perf, which gets stripped out in production (#4131)

src/core/plugins/spec/actions.js

@@ -104,6 +104,10 @@ export const resolveSpec = (json, url) => ({specActions, specSelectors, errActio
 
   let specStr = specSelectors.specStr()
 
+  /* develblock:start */
+  require("root/src/perf").start("resolve")
+  /* develblock:end */
+
   return resolve({
     fetch,
     spec: json,
@@ -131,6 +135,9 @@ export const resolveSpec = (json, url) => ({specActions, specSelectors, errActio
         errActions.newThrownErrBatch(preparedErrors)
       }
 
+    /* develblock:start */
+    require("root/src/perf").stop("resolve")
+    /* develblock:end */
       return specActions.updateResolved(spec)
     })
 }

src/core/plugins/spec/reducers.js

@@ -42,7 +42,15 @@ export default {
   },
 
   [UPDATE_RESOLVED]: (state, action) => {
-    return state.setIn(["resolved"], fromJSOrdered(action.payload))
+    /* develblock:start */
+    require("root/src/perf").start("UPDATE_RESOLVED")
+    /* develblock:end */
+    const resolved = fromJSOrdered(action.payload)
+
+    /* develblock:start */
+    require("root/src/perf").stop("UPDATE_RESOLVED")
+    /* develblock:end */
+    return state.setIn(["resolved"], resolved)
   },
 
   [UPDATE_RESOLVED_SUBTREE]: (state, action) => {

src/core/system.js

@@ -15,9 +15,15 @@ const idFn = a => a
 function createStoreWithMiddleware(rootReducer, initialState, getSystem) {
 
   let middlwares = [
-    // createLogger( {
-    //   stateTransformer: state => state && state.toJS()
-    // } ),
+    /* develblock:start */
+    // Measure actions
+    () => next => action => {
+      require("root/src/perf").start("action:"+action.type)
+      const res = next(action)
+      require("root/src/perf").stop("action:"+action.type)
+      return res
+    },
+    /* develblock:end */
     systemThunkMiddleware( getSystem )
   ]
 

src/perf.js

@@ -0,0 +1,16 @@
+// This uses experimental console methods, to track performance
+
+module.exports = {
+  start(str) {
+    /* develblock:start */
+    // eslint-disable-next-line no-console
+    console.time(str)
+    /* develblock:end */
+  },
+  stop(str) {
+    /* develblock:start */
+    // eslint-disable-next-line no-console
+    console.timeEnd(str)
+    /* develblock:end */
+  }
+}