add objectMode option

Author: stephenlacy

README.md

@@ -41,4 +41,12 @@ file
 ```
 
 
+### Options
+
+##### objectMode
+
+> Enable [objectMode](https://nodejs.org/api/stream.html#stream_object_mode)
+
+default: true
+
 ## [License](LICENSE) (MIT)

index.js

@@ -2,9 +2,14 @@ var Excel = require('exceljs')
 var through = require('through2')
 var duplex = require('duplexify')
 
-module.exports = function exceljsStream() {
+var defaultOpts = {
+  objectMode: true
+}
+
+module.exports = function exceljsStream(opts) {
+  opts = opts || defaultOpts
   var input = through()
-  var second = through()
+  var second = through({ objectMode: opts.objectMode })
   var workbook = new Excel.Workbook()
 
   var headers = null
@@ -21,7 +26,11 @@ module.exports = function exceljsStream() {
            if (!headers) return
           item[headers[k]] = v
         })
-        second.push(JSON.stringify(item))
+        if (!opts.objectMode) {
+          second.push(JSON.stringify(item))
+          return
+        }
+        second.push(item)
       })
     })
     second.emit('end')

test/index.js

@@ -17,7 +17,26 @@ describe('exceljs-through-stream', function () {
     var res = []
     file.pipe(exs())
       .on('data', function (d) {
-        res.push(JSON.parse(String(d)))
+        res.push(d)
+      })
+      .on('end', function () {
+        should(res.length).equal(4)
+        should(JSON.stringify(res[0])).equal(
+        JSON.stringify({
+          row: 'row1',
+          date: '2017-02-08T00:00:00.000Z',
+          cost: 100,
+          notes: 111
+        }))
+        done()
+      })
+  })
+  it('parse xlsx files with string mode', function (done) {
+    var file = fs.createReadStream(__dirname + '/file.xlsx')
+    var res = []
+    file.pipe(exs({ objectMode: false }))
+      .on('data', function (d) {
+        res.push(JSON.parse(d))
       })
       .on('end', function () {
         should(res.length).equal(4)