diff --git a/package-lock.json b/package-lock.json
index 381b502d49a..0b10f506baf 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11861 +1,163 @@
 {
   "name": "plotly.js",
   "version": "1.41.3",
-  "lockfileVersion": 1,
-  "requires": true,
+  "description": "The open source javascript graphing library that powers plotly",
+  "license": "MIT",
+  "main": "./lib/index.js",
+  "webpack": "./dist/plotly.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/plotly/plotly.js.git"
+  },
+  "bugs": {
+    "url": "https://github.com/plotly/plotly.js/issues"
+  },
+  "author": "Plotly, Inc.",
+  "keywords": [
+    "graphing",
+    "plotting",
+    "data",
+    "visualization",
+    "plotly"
+  ],
+  "scripts": {
+    "preprocess": "node tasks/preprocess.js",
+    "bundle": "node tasks/bundle.js",
+    "header": "node tasks/header.js",
+    "stats": "node tasks/stats.js",
+    "find-strings": "node tasks/find_locale_strings.js",
+    "build": "npm run preprocess && npm run find-strings && npm run bundle && npm run header && npm run stats",
+    "cibuild": "npm run preprocess && node tasks/cibundle.js",
+    "watch": "node tasks/watch.js",
+    "lint": "eslint --version && eslint .",
+    "lint-fix": "eslint . --fix || true",
+    "docker": "node tasks/docker.js",
+    "pretest": "node tasks/pretest.js",
+    "test-jasmine": "karma start test/jasmine/karma.conf.js",
+    "test-image": "node tasks/test_image.js",
+    "test-image-gl2d": "node tasks/test_image.js gl2d_* --queue",
+    "test-export": "node tasks/test_export.js",
+    "test-syntax": "node tasks/test_syntax.js && npm run find-strings -- --no-output",
+    "test-bundle": "node tasks/test_bundle.js",
+    "test": "npm run test-jasmine && npm run test-bundle && npm run test-image && npm run test-image-gl2d && npm run test-syntax && npm run lint",
+    "start-test_dashboard": "node devtools/test_dashboard/server.js",
+    "start-image_viewer": "node devtools/image_viewer/server.js",
+    "start": "npm run start-test_dashboard",
+    "baseline": "node tasks/baseline.js",
+    "preversion": "check-node-version --node 10 --npm 6 && npm-link-check && npm ls --prod",
+    "version": "npm run build && git add -A dist src build",
+    "postversion": "node -e \"console.log('Version bumped and committed. If ok, run: git push && git push --tags')\"",
+    "postpublish": "node tasks/sync_packages.js"
+  },
+  "browserify": {
+    "transform": [
+      "glslify",
+      "./tasks/compress_attributes.js"
+    ]
+  },
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+    "mouse-wheel": "^1.0.2",
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+    "ndarray-fill": "^1.0.2",
+    "ndarray-homography": "^1.0.0",
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+    "point-cluster": "^3.1.4",
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+    "regl-error2d": "^2.0.5",
+    "regl-line2d": "^3.0.11",
+    "regl-scatter2d": "^3.0.6",
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+    "sane-topojson": "^2.0.0",
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+    "superscript-text": "^1.0.0",
+    "svg-path-sdf": "^1.1.2",
+    "tinycolor2": "^1.3.0",
+    "topojson-client": "^2.1.0",
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+    "world-calendars": "^1.0.3"
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+    "brfs": "^2.0.0",
+    "browserify": "^16.2.2",
+    "browserify-transform-tools": "^1.7.0",
+    "check-node-version": "^3.2.0",
+    "deep-equal": "^1.0.1",
+    "derequire": "^2.0.6",
+    "ecstatic": "^3.2.1",
+    "eslint": "^5.3.0",
+    "falafel": "^2.0.0",
+    "fs-extra": "^2.0.0",
+    "fuse.js": "^3.2.1",
+    "glob": "^7.0.0",
+    "gzip-size": "^5.0.0",
+    "image-size": "^0.6.3",
+    "into-stream": "^3.1.0",
+    "jasmine-core": "^2.99.1",
+    "jsdom": "^11.12.0",
+    "karma": "^3.0.0",
+    "karma-browserify": "^5.3.0",
+    "karma-chrome-launcher": "^2.0.0",
+    "karma-fail-fast-reporter": "^1.0.5",
+    "karma-firefox-launcher": "^1.0.1",
+    "karma-jasmine": "^1.1.2",
+    "karma-jasmine-spec-tags": "^1.0.1",
+    "karma-spec-reporter": "0.0.32",
+    "karma-verbose-reporter": "0.0.6",
+    "karma-viewport": "^1.0.2",
+    "madge": "^3.2.0",
+    "minify-stream": "^1.2.0",
+    "minimist": "^1.2.0",
+    "node-sass": "^4.9.3",
+    "npm-link-check": "^2.0.0",
+    "open": "0.0.5",
+    "prepend-file": "^1.3.1",
+    "prettysize": "1.1.0",
+    "read-last-lines": "^1.6.0",
+    "requirejs": "^2.3.1",
+    "run-series": "^1.1.8",
+    "through2": "^2.0.3",
+    "true-case-path": "^1.0.2",
+    "watchify": "^3.11.0",
+    "xml2js": "^0.4.16"
   }
-}
+}
\ No newline at end of file
diff --git a/src/traces/parcoords/parcoords.js b/src/traces/parcoords/parcoords.js
index 3b2ed55a218..14874abaccf 100644
--- a/src/traces/parcoords/parcoords.js
+++ b/src/traces/parcoords/parcoords.js
@@ -456,16 +456,15 @@ module.exports = function(root, svg, parcoordsLineLayers, styledData, layout, ca
 
     parcoordsLineLayer
         .each(function(d) {
-
             if(d.viewModel) {
-                if(d.lineLayer) d.lineLayer.update(d);
-                else d.lineLayer = lineLayerMaker(this, d);
+                if(!d.lineLayer || callbacks) { // recreate in case of having callbacks e.g. restyle. Should we test for callback to be a restyle?
+                    d.lineLayer = lineLayerMaker(this, d);
+                } else d.lineLayer.update(d);
 
-                d.viewModel[d.key] = d.lineLayer;
+                if(d.key || d.key === 0) d.viewModel[d.key] = d.lineLayer;
 
-                var setChanged = ((d.key) &&
-                    (((d.key !== 'contextLayer') || (callbacks)) || // unless there is callback on this line layer
-                    (!d.context))); // don't update background
+                var setChanged = (!d.context || // don't update background
+                                  callbacks);   // unless there is a callback on the context layer. Should we test the callback?
 
                 d.lineLayer.render(d.viewModel.panels, setChanged);
             }
diff --git a/test/image/baselines/gl2d_parcoords_3.png b/test/image/baselines/gl2d_parcoords_3.png
new file mode 100644
index 00000000000..37c707478be
Binary files /dev/null and b/test/image/baselines/gl2d_parcoords_3.png differ
diff --git a/test/image/mocks/gl2d_parcoords_3.json b/test/image/mocks/gl2d_parcoords_3.json
new file mode 100644
index 00000000000..a2a6f8ae360
--- /dev/null
+++ b/test/image/mocks/gl2d_parcoords_3.json
@@ -0,0 +1,78 @@
+{
+
+  "data": [
+
+    {
+
+      "type": "parcoords",
+
+      "line": { "color": "blue" },
+
+      "dimensions": [
+
+        {
+
+          "label": "A",
+
+          "values": [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100],
+
+          "range": [-1, 101],
+
+          "constraintrange": [[15, 25], [45,85]]
+
+        }, {
+
+          "label": "B",
+
+          "values": [0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0],
+
+          "range": [-0.25, 1.25],
+
+          "constraintrange": [-0.1, 0.1]
+
+        }, {
+
+          "label": "C",
+
+          "values": [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100],
+
+          "range": [-1, 101]
+
+        }
+
+      ]
+
+    }
+
+  ],
+
+  "layout": {
+
+    "title": "Parallel Coordinates",
+
+    "width": 700,
+
+    "height": 500,
+
+    "hovermode": "closest",
+
+    "autosize": true,
+
+    "margin": {
+
+      "b": 80,
+
+      "l": 80,
+
+      "r": 40,
+
+      "t": 40
+
+    }
+
+  },
+
+  "config": { "editable": true, "displaylogo": false }
+
+}
+
diff --git a/test/jasmine/tests/config_test.js b/test/jasmine/tests/config_test.js
index 395b8f36d4e..dd6ce559ca0 100644
--- a/test/jasmine/tests/config_test.js
+++ b/test/jasmine/tests/config_test.js
@@ -7,6 +7,7 @@ var click = require('../assets/click');
 var mouseEvent = require('../assets/mouse_event');
 var failTest = require('../assets/fail_test');
 var delay = require('../assets/delay');
+var RESIZE_DELAY = 300;
 
 describe('config argument', function() {
 
@@ -585,7 +586,7 @@ describe('config argument', function() {
             viewport.set(width / 2, height / 2);
 
             return Promise.resolve()
-            .then(delay(200))
+            .then(delay(RESIZE_DELAY))
             .then(function() {
                 checkLayoutSize(elWidth / 2, elHeight / 2);
             })
@@ -639,7 +640,7 @@ describe('config argument', function() {
             Plotly.plot(gd, data, {}, {responsive: true})
             .then(function() {return Plotly.restyle(gd, 'y[0]', data[0].y[0] + 2);})
             .then(function() {viewport.set(width / 2, width / 2);})
-            .then(delay(200))
+            .then(delay(RESIZE_DELAY))
             // .then(function() {viewport.set(newWidth, 2 * newHeight);}).then(delay(200))
             .then(function() {
                 expect(cntWindowResize).toBe(1);
@@ -667,7 +668,7 @@ describe('config argument', function() {
             // Resize viewport
             .then(function() {viewport.set(width / 2, height / 2);})
             // Wait for resize to happen (Plotly.resize has an internal timeout)
-            .then(delay(200))
+            .then(delay(RESIZE_DELAY))
             // Check that final figure's size hasn't changed
             .then(function() {checkLayoutSize(width, height);})
             .catch(failTest)
diff --git a/test/jasmine/tests/parcoords_test.js b/test/jasmine/tests/parcoords_test.js
index 0e1a74406bc..b434770bf2f 100644
--- a/test/jasmine/tests/parcoords_test.js
+++ b/test/jasmine/tests/parcoords_test.js
@@ -14,6 +14,9 @@ var click = require('../assets/click');
 var supplyAllDefaults = require('../assets/supply_defaults');
 var readPixel = require('../assets/read_pixel');
 
+// mock to test restyle
+var mock3 = require('@mocks/gl2d_parcoords_3.json');
+
 // mock with two dimensions (one panel); special case, e.g. left and right panel is obv. the same
 var mock2 = require('@mocks/gl2d_parcoords_2.json');
 
@@ -868,7 +871,99 @@ describe('parcoords basic use', function() {
 
     });
 
-    it('@gl Calling `Plotly.restyle` with a string path should amend the preexisting parcoords', function(done) {
+    function _getGrayRatio(msg) {
+        var totalRGB;
+
+        var canvases = d3.selectAll('.gl-canvas');
+
+        canvases.each(function(element, index) {
+
+            if (index === 0) { // FIXME: we assumed here that the context is the first item but may be not.
+
+                //console.log("index=", index);
+                //console.log("element=", element);
+
+                var imageArray = readPixel(this, 0, 0, this.width, this.height);
+
+                totalRGB = 0;
+                var n = imageArray.length;
+                for(var i = 0; i < n; i++) {
+
+                    totalRGB += imageArray[i]
+                }
+
+                //console.log("totalRGB=", totalRGB);
+            }
+        });
+
+        return totalRGB;
+    }
+
+    fit('@gl displays same context after react to constraintrange change', function(done) {
+        var mockCopy = Lib.extendDeep({}, mock3);
+
+        var totalRGB1 = 0;
+        var totalRGB2 = 0;
+
+        Plotly.plot(gd, mock3)
+        .then(function() {
+            totalRGB1 = _getGrayRatio()
+        })
+        .then(function() {
+            mockCopy.data[0].dimensions[1].constraintrange = [0.4, 0.6];
+
+            return Plotly.react(gd, mockCopy);
+        })
+        .then(function() {
+            totalRGB2 = _getGrayRatio()
+        })
+        .then(function() {
+
+            console.log(totalRGB1, totalRGB2)
+
+            expect(totalRGB2).toEqual(totalRGB1);
+        })
+        .catch(failTest)
+        .then(done);
+    });
+
+    fit('@gl Calling `Plotly.restyle` with a string path to line color should amend the preexisting parcoords', function(done) {
+        function getAvgPixelByChannel() {
+            var canvas = d3.select('.gl-canvas-context').node();
+            var imgData = readPixel(canvas, 0, 0, canvas.width, canvas.height);
+            var r = 0;
+            var g = 0;
+            var b = 0;
+
+            for(var i = 0; i < imgData.length; i++) {
+                r += imgData[i++];
+                g += imgData[i++];
+                b += imgData[i++];
+            }
+
+            console.log(r, g, b, i, canvas.width * canvas.height, imgData.length / 4)
+
+            var n = imgData.length / 4;
+            r /= n;
+            g /= n;
+            b /= n;
+
+            return [r, g, b];
+        }
+
+        expect(gd.data.length).toEqual(1);
+            console.log(getAvgPixelByChannel());
+
+        Plotly.restyle(gd, 'line.color', 'red').then(function() {
+
+            console.log(getAvgPixelByChannel());
+            expect(gd.data.length).toEqual(1);
+        })
+        .catch(failTest)
+        .then(done);
+    });
+
+    it('@gl Calling `Plotly.restyle` with a string path to colorscale should amend the preexisting parcoords', function(done) {
 
         expect(gd.data.length).toEqual(1);