Workaround on build bug of rollup0.51.

src/scale/Scale.js

@@ -28,14 +28,12 @@ function Scale(setting) {
     this.init && this.init.apply(this, arguments);
 }
 
-var scaleProto = Scale.prototype;
-
 /**
  * Parse input val to valid inner number.
  * @param {*} val
  * @return {number}
  */
-scaleProto.parse = function (val) {
+Scale.prototype.parse = function (val) {
     // Notice: This would be a trap here, If the implementation
     // of this method depends on extent, and this method is used
     // before extent set (like in dataZoom), it would be wrong.
@@ -43,11 +41,11 @@ scaleProto.parse = function (val) {
     return val;
 };
 
-scaleProto.getSetting = function (name) {
+Scale.prototype.getSetting = function (name) {
     return this._setting[name];
 };
 
-scaleProto.contain = function (val) {
+Scale.prototype.contain = function (val) {
     var extent = this._extent;
     return val >= extent[0] && val <= extent[1];
 };
@@ -57,7 +55,7 @@ scaleProto.contain = function (val) {
  * @param {number} val
  * @return {number}
  */
-scaleProto.normalize = function (val) {
+Scale.prototype.normalize = function (val) {
     var extent = this._extent;
     if (extent[1] === extent[0]) {
         return 0.5;
@@ -70,7 +68,7 @@ scaleProto.normalize = function (val) {
  * @param {number} val
  * @return {number}
  */
-scaleProto.scale = function (val) {
+Scale.prototype.scale = function (val) {
     var extent = this._extent;
     return val * (extent[1] - extent[0]) + extent[0];
 };
@@ -79,7 +77,7 @@ scaleProto.scale = function (val) {
  * Set extent from data
  * @param {Array.<number>} other
  */
-scaleProto.unionExtent = function (other) {
+Scale.prototype.unionExtent = function (other) {
     var extent = this._extent;
     other[0] < extent[0] && (extent[0] = other[0]);
     other[1] > extent[1] && (extent[1] = other[1]);
@@ -92,7 +90,7 @@ scaleProto.unionExtent = function (other) {
  * @param {module:echarts/data/List} data
  * @param {string} dim
  */
-scaleProto.unionExtentFromData = function (data, dim) {
+Scale.prototype.unionExtentFromData = function (data, dim) {
     this.unionExtent(data.getDataExtent(dim, true));
 };
 
@@ -100,7 +98,7 @@ scaleProto.unionExtentFromData = function (data, dim) {
  * Get extent
  * @return {Array.<number>}
  */
-scaleProto.getExtent = function () {
+Scale.prototype.getExtent = function () {
     return this._extent.slice();
 };
 
@@ -109,7 +107,7 @@ scaleProto.getExtent = function () {
  * @param {number} start
  * @param {number} end
  */
-scaleProto.setExtent = function (start, end) {
+Scale.prototype.setExtent = function (start, end) {
     var thisExtent = this._extent;
     if (!isNaN(start)) {
         thisExtent[0] = start;
@@ -122,7 +120,7 @@ scaleProto.setExtent = function (start, end) {
 /**
  * @return {Array.<string>}
  */
-scaleProto.getTicksLabels = function () {
+Scale.prototype.getTicksLabels = function () {
     var labels = [];
     var ticks = this.getTicks();
     for (var i = 0; i < ticks.length; i++) {
@@ -135,7 +133,7 @@ scaleProto.getTicksLabels = function () {
  * When axis extent depends on data and no data exists,
  * axis ticks should not be drawn, which is named 'blank'.
  */
-scaleProto.isBlank = function () {
+Scale.prototype.isBlank = function () {
     return this._isBlank;
 },
 
@@ -143,7 +141,7 @@ scaleProto.isBlank = function () {
  * When axis extent depends on data and no data exists,
  * axis ticks should not be drawn, which is named 'blank'.
  */
-scaleProto.setBlank = function (isBlank) {
+Scale.prototype.setBlank = function (isBlank) {
     this._isBlank = isBlank;
 };