move up cursorFocus const, fix esm build. close #169.

Author: leeoniya

dist/uPlot.cjs.js

@@ -1031,6 +1031,9 @@ function uPlot(opts, data, then) {
 
 	 (cursor.points.show = fnOrSelf(cursor.points.show));
 
+	var focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
+	var cursorFocus =  focus.prox >= 0;
+
 	// series-intersection markers
 	var cursorPts = [null];
 
@@ -2019,9 +2022,6 @@ function uPlot(opts, data, then) {
 
 	var dragging = false;
 
-	var focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
-	var cursorFocus =  focus.prox >= 0;
-
 	var drag =  cursor.drag;
 
 	if ( cursor.show) {

dist/uPlot.esm.js

@@ -1034,6 +1034,9 @@ function uPlot(opts, data, then) {
 
 	 (cursor.points.show = fnOrSelf(cursor.points.show));
 
+	const focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
+	const cursorFocus =  focus.prox >= 0;
+
 	// series-intersection markers
 	let cursorPts = [null];
 
@@ -2011,9 +2014,6 @@ function uPlot(opts, data, then) {
 
 	let dragging = false;
 
-	const focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
-	const cursorFocus =  focus.prox >= 0;
-
 	const drag =  cursor.drag;
 
 	if ( cursor.show) {

dist/uPlot.iife.js

@@ -1032,6 +1032,9 @@ var uPlot = (function () {
 
 		 (cursor.points.show = fnOrSelf(cursor.points.show));
 
+		var focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
+		var cursorFocus =  focus.prox >= 0;
+
 		// series-intersection markers
 		var cursorPts = [null];
 
@@ -2020,9 +2023,6 @@ var uPlot = (function () {
 
 		var dragging = false;
 
-		var focus = self.focus = assign({}, opts.focus || {alpha: 0.3},  cursor.focus);
-		var cursorFocus =  focus.prox >= 0;
-
 		var drag =  cursor.drag;
 
 		if ( cursor.show) {