diff --git a/src/js/charts/cb-chart-grid/parse-chart-grid.js b/src/js/charts/cb-chart-grid/parse-chart-grid.js
index e24eba9f..a9a0b5e9 100644
--- a/src/js/charts/cb-chart-grid/parse-chart-grid.js
+++ b/src/js/charts/cb-chart-grid/parse-chart-grid.js
@@ -78,7 +78,7 @@ function parseChartgrid(config, _chartProps, callback, parseOpts) {
 		var factor = Math.pow(10, maxPrecision);
 		gridSettings.type = _chartProps._grid.type || "line";
 
-		_computed = {
+		var _computed = {
 			//TODO look at entries for all series not just the first
 			data: bySeries.series[0].values.map(function(d){return +d.entry}),
 			hasColumn: false,
diff --git a/src/js/charts/cb-xy/parse-xy.js b/src/js/charts/cb-xy/parse-xy.js
index ab1bbe58..5803fb8a 100644
--- a/src/js/charts/cb-xy/parse-xy.js
+++ b/src/js/charts/cb-xy/parse-xy.js
@@ -182,7 +182,7 @@ function parseXY(config, _chartProps, callback, parseOpts) {
 
 	if (bySeries.isNumeric) {
 		scale.isNumeric = bySeries.isNumeric;
-		_computed = {
+		var _computed = {
 			//TODO look at entries for all series not just the first
 			data: bySeries.series[0].values.map(function(d){return +d.entry}),
 			hasColumn: false,
diff --git a/src/js/components/ChartExport.jsx b/src/js/components/ChartExport.jsx
index 52fa9343..8d3b4f50 100644
--- a/src/js/components/ChartExport.jsx
+++ b/src/js/components/ChartExport.jsx
@@ -101,7 +101,7 @@ var ChartExport = React.createClass({
 	},
 
 	downloadPNG: function() {
-		filename = this._makeFilename("png");
+		var filename = this._makeFilename("png");
 		saveSvgAsPng.saveSvgAsPng(this.state.chartNode, filename, { scale: 2.0 });
 	},
 
diff --git a/src/js/components/shared/DataInput.jsx b/src/js/components/shared/DataInput.jsx
index 1af7d846..d3bcf56f 100644
--- a/src/js/components/shared/DataInput.jsx
+++ b/src/js/components/shared/DataInput.jsx
@@ -43,13 +43,13 @@ var DataInput = React.createClass({
 
 	_handleReparseUpdate: function(k, v) {
 		if (k == "input") {
-			input = update(this.props.chartProps.input, { $merge: {
+			var input = update(this.props.chartProps.input, { $merge: {
 				raw: v,
 				type: undefined
 			}});
 			ChartViewActions.updateInput(k, input);
 		} else if (k == "type") {
-			input = update(this.props.chartProps.input, { $set: {
+			var input = update(this.props.chartProps.input, { $set: {
 				raw: v.raw,
 				type: v.type
 			}});
diff --git a/src/js/util/parse-delimited-input.js b/src/js/util/parse-delimited-input.js
index d33c67ab..90d89692 100644
--- a/src/js/util/parse-delimited-input.js
+++ b/src/js/util/parse-delimited-input.js
@@ -131,6 +131,7 @@ function cast_data(input, columnNames, stripCharsRegex, opts) {
 
 	var index_types = unique(all_index_types);
 
+	/* Dead code, hasDate/isNumeric never used, and strict mode complains about assignment to undefined
 	if(index_types.length !== 1 && !opts.type) {
 
 	}
@@ -138,6 +139,7 @@ function cast_data(input, columnNames, stripCharsRegex, opts) {
 		hasDate = opts.type ? opts.type == "date" : index_types[0] === "date";
 		isNumeric = opts.type ? opts.type == "numeric" : index_types[0] === "number";
 	}
+	*/
 
 	return {
 		data: data,
diff --git a/src/js/util/validate-data-input.js b/src/js/util/validate-data-input.js
index 1a09d47c..ae769507 100644
--- a/src/js/util/validate-data-input.js
+++ b/src/js/util/validate-data-input.js
@@ -8,7 +8,7 @@ var some = require("lodash/some");
 var unique = require("lodash/uniq");
 var catchChartMistakes = require("./catch-chart-mistakes");
 
-types = {
+let types = {
 	"number": "numeric",
 	"object": "date",
 	"string": "ordinal"