typescript - Angular CLI AOT build error cache? -

i have angular (2) app failing build using aot compiler. what's strange nuked component error , rebuilt ground adding 1 line @ time trace issue (the aot error useless). rebuilt error appeared, removed last thing added , reason error persisted. went far take component way basic structure provided angular cli error message persisted. idea what's happening? see below component in it's current does-nothing state throwing following error:

error in /path_removed/$$_gendir/app/dashboard-chart/dashboard-chart.component.ngfactory.ts (49,9): supplied parameters not match signature of call target. 

using build command

ng serve --aot --prod 

dashboard-chart.ts

import { component, oninit, onchanges, input, viewchild, elementref, viewencapsulation } '@angular/core';  @component({   selector: 'dashboard-chart',   templateurl: './dashboard-chart.component.html',   styleurls: ['./dashboard-chart.component.css'],   encapsulation: viewencapsulation.none }) export class dashboardchartcomponent implements oninit, onchanges {     @viewchild('chart') chartcontainer: elementref;     @input() data: any[];      constructor() { }      ngoninit() {      }      ngonchanges() {      }  } 

dashboard-component.html

<div class="d3-chart" #chart></div>