Avoid use of node stream in browser context.

Gruntfile.js

@@ -2,6 +2,12 @@ module.exports = function(grunt) {
 	grunt.initConfig({
 		uglify: {
 			options: {
+				compress: {
+					global_defs: {
+						'PAPA_BROWSER_CONTEXT': true
+					},
+					dead_code: true
+				},
 				output: {
 					comments: 'some',
 				},

package.json

@@ -35,6 +35,7 @@
 	},
 	"license": "MIT",
 	"main": "papaparse.js",
+	"browser": "papaparse.min.js",
 	"devDependencies": {
 		"chai": "^4.2.0",
 		"connect": "^3.3.3",

papaparse.js

@@ -81,7 +81,9 @@ if (!Array.isArray)
 	Papa.FileStreamer = FileStreamer;
 	Papa.StringStreamer = StringStreamer;
 	Papa.ReadableStreamStreamer = ReadableStreamStreamer;
-	Papa.DuplexStreamStreamer = DuplexStreamStreamer;
+	if (typeof PAPA_BROWSER_CONTEXT === 'undefined') {
+		Papa.DuplexStreamStreamer = DuplexStreamStreamer;
+	}
 
 	if (global.jQuery)
 	{
@@ -241,7 +243,7 @@ if (!Array.isArray)
 		}
 
 		var streamer = null;
-		if (_input === Papa.NODE_STREAM_INPUT)
+		if (_input === Papa.NODE_STREAM_INPUT && typeof PAPA_BROWSER_CONTEXT === 'undefined')
 		{
 			// create a node Duplex stream for use
 			// with .pipe
@@ -982,8 +984,10 @@ if (!Array.isArray)
 		});
 		stream.once('finish', bindFunction(this._onWriteComplete, this));
 	}
-	DuplexStreamStreamer.prototype = Object.create(ChunkStreamer.prototype);
-	DuplexStreamStreamer.prototype.constructor = DuplexStreamStreamer;
+	if (typeof PAPA_BROWSER_CONTEXT === 'undefined') {
+		DuplexStreamStreamer.prototype = Object.create(ChunkStreamer.prototype);
+		DuplexStreamStreamer.prototype.constructor = DuplexStreamStreamer;
+	}
 
 
 	// Use one ParserHandle per entire CSV file or string