a call to scheduleUpdate from setState

component.js

import {scheduleUpdate} from "./reconciler"

export class Component {
  constructor(props) {
    this.props = props || {};
    this.state = this.state || {};
  }

  setState(partialState) {
    // we'll define this function in the reconciler.js file.
    scheduleUpdate(this, partialState);
  }
}