stream problem louis

import {Observable, ReplaySubject} from 'rxjs/Rx';

const events$ = Observable.fromEvent(document, 'click').map(e => e.x);
events$.subscribe((x) => {
  doCall(x);

})



const batch$ = new ReplaySubject();
function doCall(x){
  const res$ = Observable.ajax({
    url:`https://api.giphy.com/v1/gifs/search?q=${x}&api_key=dc6zaTOxFJmzC`
  })
  batch$.next(res$);
  // batch$: ---call1$-call2$--------call3$-call4$-...
  // buffered$:-call1$-call2$|
  const arr = batch$.bufferTime(100);
  console.log(arr);
  return res$;
}

function writeLine(text) {
  const logger = document.getElementById('logger');
  var p = document.createTextNode(text);
 
  logger.appendChild(p);
  logger.appendChild(document.createElement('br'));
}

<!DOCTYPE html>
<html>
  <head>
    <title>Infinite scroll list by Brecht Billiet</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- 1. Load libraries -->
     <!-- Polyfill(s) for older browsers -->
    <script src="https://npmcdn.com/core-js/client/shim.min.js"></script>
    <script src="https://npmcdn.com/zone.js@0.7.2?main=browser"></script>
    <script src="https://npmcdn.com/reflect-metadata@0.1.3"></script>
    <script src="https://npmcdn.com/systemjs@0.19.27/dist/system.src.js"></script>

    <!-- 2. Configure SystemJS -->
    <script src="systemjs.config.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <script>
      System.import('app').catch(function(err){ console.error(err); });
    </script>
  </head>

  <body>
    <div id="logger">
      
    </div>
  </body>
</html>

/**
 * PLUNKER VERSION (based on systemjs.config.js in angular.io)
 * System configuration for Angular 2 samples
 * Adjust as necessary for your application needs.
 */
(function(global) {

  var ngVer = '@4.0.0'; // lock in the angular package version; do not let it float to current!

  //map tells the System loader where to look for things
  var map = {
    'app':                        'app',
    '@angular':                   'https://npmcdn.com/@angular', // sufficient if we didn't pin the version
    'rxjs':                       'https://npmcdn.com/rxjs',
    'ts':                         'https://npmcdn.com/plugin-typescript@4.0.10/lib/plugin.js',
    'typescript':                 'https://npmcdn.com/typescript@1.9.0-dev.20160409/lib/typescript.js',
    'lodash':                     'https://npmcdn.com/lodash'
 };

  //packages tells the System loader how to load when no filename and/or no extension
  var packages = {
    'app':                        { main: 'main.ts',  defaultExtension: 'ts' },
    'rxjs':                       { defaultExtension: 'js' }
  };

  var ngPackageNames = [
    'common',
    'compiler',
    'core',
    'platform-browser',
    'platform-browser-dynamic'
  ];

  // Add map entries for each angular package
  // only because we're pinning the version with `ngVer`.
  ngPackageNames.forEach(function(pkgName) {
    map['@angular/'+pkgName] = 'https://npmcdn.com/@angular/' + pkgName + ngVer;
  });

  // Add package entries for angular packages
  ngPackageNames.concat(['forms', 'router', 'router-deprecated']).forEach(function(pkgName) {

    // Bundled (~40 requests):
    packages['@angular/'+pkgName] = { main: '/bundles/' + pkgName + '.umd.js', defaultExtension: 'js' };

    // Individual files (~300 requests):
    //packages['@angular/'+pkgName] = { main: 'index.js', defaultExtension: 'js' };
  });

  var config = {
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      tsconfig: true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    map: map,
    packages: packages
  };

  System.config(config);

})(this);

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true
  }
}