prefer-const rule for JS / manual fixes

modules/scene/controls/CADTrackballControls.js

@@ -53,21 +53,20 @@ export function CADTrackballControls( object, domElement ) {
 
   let _state = STATE.NONE,
     _prevState = STATE.NONE,
+    _lastAngle = 0,
+    _touchZoomDistanceStart = 0,
+    _touchZoomDistanceEnd = 0;
 
-    _eye = new THREE.Vector3(),
+  const _eye = new THREE.Vector3(),
 
     _movePrev = new THREE.Vector2(),
     _moveCurr = new THREE.Vector2(),
 
     _lastAxis = new THREE.Vector3(),
-    _lastAngle = 0,
 
     _zoomStart = new THREE.Vector2(),
     _zoomEnd = new THREE.Vector2(),
 
-    _touchZoomDistanceStart = 0,
-    _touchZoomDistanceEnd = 0,
-
     _panStart = new THREE.Vector2(),
     _panEnd = new THREE.Vector2();
 
@@ -154,13 +153,14 @@ export function CADTrackballControls( object, domElement ) {
 
   this.rotateCamera = ( function() {
 
-    let axis = new THREE.Vector3(),
+    const axis = new THREE.Vector3(),
       quaternion = new THREE.Quaternion(),
       eyeDirection = new THREE.Vector3(),
       objectUpDirection = new THREE.Vector3(),
       objectSidewaysDirection = new THREE.Vector3(),
-      moveDirection = new THREE.Vector3(),
+      moveDirection = new THREE.Vector3();
-      angle;
+
+    let angle;
 
     return function rotateCamera() {
 

modules/scene/objects/auxiliary.js

@@ -63,9 +63,8 @@ export class MeshArrow extends Object3D {
       this.quaternion.set(1, 0, 0, 0);
     } else {
       const axis = new Vector3();
-      let radians;
       axis.set(dir.z, 0, -dir.x).normalize();
-      radians = Math.acos(dir.y);
+      const radians = Math.acos(dir.y);
       this.quaternion.setFromAxisAngle(axis, radians);
     }
 

web/app/cad/cad-utils.js

@@ -355,7 +355,8 @@ export function Sketch() {
 }
 
 export function iteratePath(path, shift, callback) {
-  let p, q, n = path.length;
+  let p, q;
+  const n = path.length;
   for (p = n - 1,q = 0;q < n; p = q++) {
     const ai = (p + shift) % n;
     const bi = (q + shift) % n;

web/app/cad/legacy/mesh/workbench.js

@@ -80,7 +80,8 @@ export function polygonsToSegments(polygons) {
   for (let pi = 0; pi < polygons.length; pi++) {
     const segments = [];
     const poly = polygons[pi];
-    let p, q, n = poly.vertices.length;
+    let p, q;
+    const n = poly.vertices.length;
     for(p = n - 1, q = 0; q < n; p = q ++) {
       const a = poly.vertices[p];
       const b = poly.vertices[q];
@@ -105,7 +106,8 @@ export function reconstructSketchBounds(csg, face, strict) {
       }
       continue;
     }
-    let p, q, n = poly.vertices.length;
+    let p, q;
+    const n = poly.vertices.length;
     for(p = n - 1, q = 0; q < n; p = q ++) {
       const a = poly.vertices[p];
       const b = poly.vertices[q];

web/app/sketcher/components/TerminalView.jsx

@@ -221,7 +221,8 @@ export function SketcherTerminal() {
 }
 
 function sharedStartOfSortedArray(array) {
-  let a1 = array[0], a2 = array[array.length - 1], L = a1.length, i = 0;
+  const a1 = array[0], a2 = array[array.length - 1], L = a1.length;
+  let i = 0;
   while (i < L && a1.charAt(i) === a2.charAt(i)) i++;
   return a1.substring(0, i);
 }

web/app/sketcher/shapes/dim.js

@@ -112,11 +112,10 @@ export class LinearDimension extends Dimension {
 
     this.unscale = scale;
 
-    let a, b, startA, startB;
+    const a = this.getB();
-    a = this.getB();
+    const b = this.getA();
-    b = this.getA();
+    const startA = this.b;
-    startA = this.b;
+    const startB = this.a;
-    startB = this.a;
 
     const d = distanceAB(a, b);