PnP-JS-Core

pnp-basic-example.js

$pnp.sp.web 
  .lists.getByTitle('ListTitle').items 
  .get() 
  .then(function(items) { 
    // all items are in the `items` array 
  });

pnp-batch-example.js

var batchResults = [];
var batch = new $pnp.sp.createBatch();
$pnp.sp.web.getList('/sites/dev01/lists/custom01').items.inBatch(batch).get().then(function(d) {
  batchResults.push({ 
    custom01: d 
  });
});
$pnp.sp.web.getList('/sites/dev01/lists/custom02').items.inBatch(batch).get().then(function(d) {
  batchResults.push({ 
    custom02: d 
  });
});
for (var i = 0, len = 10; i < len; i += 1) {
  $pnp.sp.web.getList('/sites/dev01/lists/custom03').inBatch(batch).items.add({ 
    Title: 'Item ' + i 
  });
}
batch.execute().then(function() {
  console.log("All is done!", batchResults);
});