refactor const let var

src/Context.ts

@@ -6,14 +6,12 @@ import { IRect } from './types';
 import type { Node } from './Node';
 
 function simplifyArray(arr: Array<any>) {
-  let retArr: Array<any> = [],
+  const retArr: Array<any> = [],
     len = arr.length,
-    util = Util,
-    n,
-    val;
+    util = Util;
 
-  for (n = 0; n < len; n++) {
-    val = arr[n];
+  for (let n = 0; n < len; n++) {
+    let val = arr[n];
     if (util._isNumber(val)) {
       val = Math.round(val * 1000) / 1000;
     } else if (!util._isString(val)) {

src/Factory.ts

@@ -52,19 +52,17 @@ export const Factory = {
     validator?: Function,
     after?: Function
   ) {
-    let len = components.length,
+    const len = components.length,
       capitalize = Util._capitalize,
       getter = GET + capitalize(attr),
-      setter = SET + capitalize(attr),
-      n,
-      component;
+      setter = SET + capitalize(attr);
 
     // getter
     constructor.prototype[getter] = function () {
       const ret = {};
 
-      for (n = 0; n < len; n++) {
-        component = components[n];
+      for (let n = 0; n < len; n++) {
+        const component = components[n];
         ret[component] = this.getAttr(attr + capitalize(component));
       }
 
@@ -75,8 +73,7 @@ export const Factory = {
 
     // setter
     constructor.prototype[setter] = function (val) {
-      let oldVal = this.attrs[attr],
-        key;
+      const oldVal = this.attrs[attr];
 
       if (validator) {
         val = validator.call(this, val);
@@ -86,7 +83,7 @@ export const Factory = {
         basicValidator.call(this, val, attr);
       }
 
-      for (key in val) {
+      for (const key in val) {
         if (!val.hasOwnProperty(key)) {
           continue;
         }

src/Shape.ts

@@ -722,31 +722,25 @@ export class Shape<
    * shape.drawHitFromCache();
    */
   drawHitFromCache(alphaThreshold = 0) {
-    let cachedCanvas = this._getCanvasCache(),
+    const cachedCanvas = this._getCanvasCache(),
       sceneCanvas = this._getCachedSceneCanvas(),
       hitCanvas = cachedCanvas.hit,
       hitContext = hitCanvas.getContext(),
       hitWidth = hitCanvas.getWidth(),
-      hitHeight = hitCanvas.getHeight(),
-      hitImageData,
-      hitData,
-      len,
-      rgbColorKey,
-      i,
-      alpha;
+      hitHeight = hitCanvas.getHeight();
 
     hitContext.clear();
     hitContext.drawImage(sceneCanvas._canvas, 0, 0, hitWidth, hitHeight);
 
     try {
-      hitImageData = hitContext.getImageData(0, 0, hitWidth, hitHeight);
-      hitData = hitImageData.data;
-      len = hitData.length;
-      rgbColorKey = Util._hexToRgb(this.colorKey);
+      const hitImageData = hitContext.getImageData(0, 0, hitWidth, hitHeight);
+      const hitData = hitImageData.data;
+      const len = hitData.length;
+      const rgbColorKey = Util._hexToRgb(this.colorKey);
 
       // replace non transparent pixels with color key
-      for (i = 0; i < len; i += 4) {
-        alpha = hitData[i + 3];
+      for (let i = 0; i < len; i += 4) {
+        const alpha = hitData[i + 3];
         if (alpha > alphaThreshold) {
           hitData[i] = rgbColorKey.r;
           hitData[i + 1] = rgbColorKey.g;

src/filters/Blur.ts

@@ -121,19 +121,20 @@ function filterGaussBlurRGBA(imageData, radius) {
     pa,
     rbs;
 
-  let div = radius + radius + 1,
+  const div = radius + radius + 1,
     widthMinus1 = width - 1,
     heightMinus1 = height - 1,
     radiusPlus1 = radius + 1,
     sumFactor = (radiusPlus1 * (radiusPlus1 + 1)) / 2,
     stackStart = new BlurStack(),
-    stackEnd = null,
-    stack = stackStart,
-    stackIn: any = null,
-    stackOut: any = null,
     mul_sum = mul_table[radius],
     shg_sum = shg_table[radius];
 
+  let stackEnd = null,
+    stack = stackStart,
+    stackIn: any = null,
+    stackOut: any = null;
+
   for (i = 1; i < div; i++) {
     stack = stack.next = new BlurStack();
     if (i === radiusPlus1) {

src/filters/Brighten.ts

@@ -13,12 +13,11 @@ import { getNumberValidator } from '../Validators';
  * node.brightness(0.8);
  */
 export const Brighten: Filter = function (imageData) {
-  let brightness = this.brightness() * 255,
+  const brightness = this.brightness() * 255,
     data = imageData.data,
-    len = data.length,
-    i;
+    len = data.length;
 
-  for (i = 0; i < len; i += 4) {
+  for (let i = 0; i < len; i += 4) {
     // red
     data[i] += brightness;
     // green

src/filters/Contrast.ts

@@ -15,14 +15,13 @@ import { getNumberValidator } from '../Validators';
 export const Contrast: Filter = function (imageData) {
   const adjust = Math.pow((this.contrast() + 100) / 100, 2);
 
-  let data = imageData.data,
-    nPixels = data.length,
-    red = 150,
+  const data = imageData.data,
+    nPixels = data.length;
+  let red = 150,
     green = 150,
-    blue = 150,
-    i;
+    blue = 150;
 
-  for (i = 0; i < nPixels; i += 4) {
+  for (let i = 0; i < nPixels; i += 4) {
     red = data[i];
     green = data[i + 1];
     blue = data[i + 2];

src/filters/Emboss.ts

@@ -23,16 +23,16 @@ export const Emboss: Filter = function (imageData) {
   // pixastic greyLevel is between 0 and 255.  I want it between 0 and 1.  Also,
   // a max value of greyLevel yields a white emboss, and the min value yields a black
   // emboss.  Therefore, I changed greyLevel to whiteLevel
-  let strength = this.embossStrength() * 10,
+  const strength = this.embossStrength() * 10,
     greyLevel = this.embossWhiteLevel() * 255,
     direction = this.embossDirection(),
     blend = this.embossBlend(),
-    dirY = 0,
-    dirX = 0,
     data = imageData.data,
     w = imageData.width,
     h = imageData.height,
-    w4 = w * 4,
+    w4 = w * 4;
+  let  dirY = 0,
+    dirX = 0,
     y = h;
 
   switch (direction) {

src/filters/Enhance.ts

@@ -4,9 +4,8 @@ import { getNumberValidator } from '../Validators';
 
 function remap(fromValue: number, fromMin: number, fromMax: number, toMin: number, toMax: number) {
   // Compute the range of the data
-  let fromRange = fromMax - fromMin,
-    toRange = toMax - toMin,
-    toValue;
+  const fromRange = fromMax - fromMin,
+    toRange = toMax - toMin;
 
   // If either range is 0, then the value can only be mapped to 1 value
   if (fromRange === 0) {
@@ -17,7 +16,7 @@ function remap(fromValue: number, fromMin: number, fromMax: number, toMin: numbe
   }
 
   // (1) untranslate, (2) unscale, (3) rescale, (4) retranslate
-  toValue = (fromValue - fromMin) / fromRange;
+  let toValue = (fromValue - fromMin) / fromRange;
   toValue = toRange * toValue + toMin;
 
   return toValue;
@@ -38,18 +37,17 @@ function remap(fromValue: number, fromMin: number, fromMax: number, toMin: numbe
  * node.enhance(0.4);
  */
 export const Enhance: Filter = function (imageData) {
-  let data = imageData.data,
-    nSubPixels = data.length,
-    rMin = data[0],
+  const data = imageData.data,
+    nSubPixels = data.length;
+  let rMin = data[0],
     rMax = rMin,
     r,
     gMin = data[1],
     gMax = gMin,
     g,
     bMin = data[2],
     bMax = bMin,
-    b,
-    i;
+    b;
 
   // If we are not enhancing anything - don't do any computation
   const enhanceAmount = this.enhance();
@@ -58,7 +56,7 @@ export const Enhance: Filter = function (imageData) {
   }
 
   // 1st Pass - find the min and max for each channel:
-  for (i = 0; i < nSubPixels; i += 4) {
+  for (let i = 0; i < nSubPixels; i += 4) {
     r = data[i + 0];
     if (r < rMin) {
       rMin = r;
@@ -128,7 +126,7 @@ export const Enhance: Filter = function (imageData) {
   }
 
   // Pass 2 - remap everything, except the alpha
-  for (i = 0; i < nSubPixels; i += 4) {
+  for (let i = 0; i < nSubPixels; i += 4) {
     data[i + 0] = remap(data[i + 0], rMin, rMax, rGoalMin, rGoalMax);
     data[i + 1] = remap(data[i + 1], gMin, gMax, gGoalMin, gGoalMax);
     data[i + 2] = remap(data[i + 2], bMin, bMax, bGoalMin, bGoalMax);

src/filters/Grayscale.ts

@@ -10,13 +10,11 @@ import { Filter } from '../Node';
  * node.filters([Konva.Filters.Grayscale]);
  */
 export const Grayscale: Filter = function (imageData) {
-  let data = imageData.data,
-    len = data.length,
-    i,
-    brightness;
+  const data = imageData.data,
+    len = data.length;
 
-  for (i = 0; i < len; i += 4) {
-    brightness = 0.34 * data[i] + 0.5 * data[i + 1] + 0.16 * data[i + 2];
+  for (let i = 0; i < len; i += 4) {
+    const brightness = 0.34 * data[i] + 0.5 * data[i + 1] + 0.16 * data[i + 2];
     // red
     data[i] = brightness;
     // green