diff --git a/biome.json b/biome.json
index dd8691beddd..9f6e2acb25c 100644
--- a/biome.json
+++ b/biome.json
@@ -4,6 +4,7 @@
   "files": {
     "maxSize": 10000000,
     "includes": [
+      "**/esbuild-config.js",
       "**/src/**",
       "**/lib/**",
       "**/test/**",
diff --git a/devtools/dashboard_utilities.mjs b/devtools/dashboard_utilities.mjs
new file mode 100644
index 00000000000..8ff5c109e61
--- /dev/null
+++ b/devtools/dashboard_utilities.mjs
@@ -0,0 +1,67 @@
+import fs from 'fs';
+import path from 'path';
+import constants from '../tasks/util/constants.js';
+
+function readFilePromise(file) {
+    return new Promise((resolve, reject) => {
+        fs.readFile(file, { encoding: 'utf-8' }, (err, contents) => {
+            if (err) reject(err);
+            else resolve({ name: file, contents: contents });
+        });
+    });
+}
+
+function writeFilePromise(path, contents) {
+    return new Promise((resolve, reject) => {
+        fs.writeFile(path, contents, (err) => {
+            if (err) reject(err);
+            else resolve(path);
+        });
+    });
+}
+
+export function getMockFiles() {
+    return new Promise((resolve, reject) => {
+        fs.readdir(constants.pathToTestImageMocks, (err, files) => {
+            if (err) reject(err);
+            else resolve(files);
+        });
+    });
+}
+
+export function readFiles(files) {
+    const promises = files.map((file) => readFilePromise(path.join(constants.pathToTestImageMocks, file)));
+
+    return Promise.all(promises);
+}
+
+export function createMocksList(files) {
+    // eliminate pollutants (e.g .DS_Store) that can accumulate in the mock directory
+    const jsonFiles = files.filter((file) => file.name.substr(-5) === '.json');
+
+    const mocksList = jsonFiles.map((file) => {
+        const contents = JSON.parse(file.contents);
+
+        // get plot type keywords from mocks
+        const types = contents.data
+            .map((trace) => trace.type || 'scatter')
+            .reduce((acc, type, i, arr) => (arr.lastIndexOf(type) === i ? [...acc, type] : acc), []);
+
+        const filename = file.name.split(path.sep).pop();
+
+        return {
+            name: filename.slice(0, -5),
+            file: filename,
+            keywords: types.join(', ')
+        };
+    });
+
+    return mocksList;
+}
+
+function saveListToFile(filePath, fileName) {
+    return (list) => writeFilePromise(path.join(filePath, fileName), JSON.stringify(list, null, 2));
+}
+
+export const saveMockListToFile = saveListToFile(constants.pathToBuild, 'test_dashboard_mocks.json');
+export const saveReglTracesToFile = saveListToFile(constants.pathToBuild, 'regl_traces.json');
diff --git a/devtools/regl_codegen/server.mjs b/devtools/regl_codegen/server.mjs
index 265c6572e3c..7cd15d8486f 100644
--- a/devtools/regl_codegen/server.mjs
+++ b/devtools/regl_codegen/server.mjs
@@ -1,26 +1,25 @@
+import ecstatic from 'ecstatic';
+import { build } from 'esbuild';
 import fs from 'fs';
-import path from 'path';
 import http from 'http';
-import ecstatic from 'ecstatic';
-import open from 'open';
 import minimist from 'minimist';
-
+import open from 'open';
+import path from 'path';
+import { localDevReglCodegenConfig as config } from '../../esbuild-config.js';
 import constants from '../../tasks/util/constants.js';
-import { build } from 'esbuild';
-import config from '../../esbuild-config.js';
+import {
+    createMocksList,
+    getMockFiles,
+    readFiles,
+    saveMockListToFile,
+    saveReglTracesToFile
+} from '../dashboard_utilities.mjs';
 
 var args = minimist(process.argv.slice(2), {});
 var PORT = args.port || 3000;
 var strict = args.strict;
 
-var reglTraceList = [
-    'parcoords',
-    'scattergl',
-    'scatterpolargl',
-    'splom'
-];
-
-
+var reglTraceList = ['parcoords', 'scattergl', 'scatterpolargl', 'splom'];
 
 // Create server
 var _static = ecstatic({
@@ -32,13 +31,13 @@ var _static = ecstatic({
 
 var tracesReceived = [];
 
-var server = http.createServer(function(req, res) {
-    if(req.method === 'POST' && req.url === '/api/submit-code') {
+var server = http.createServer(function (req, res) {
+    if (req.method === 'POST' && req.url === '/api/submit-code') {
         var body = '';
-        req.on('data', function(data) {
+        req.on('data', function (data) {
             body += data;
         });
-        req.on('end', function() {
+        req.on('end', function () {
             var data = JSON.parse(body);
 
             tracesReceived.push(data.trace);
@@ -46,7 +45,7 @@ var server = http.createServer(function(req, res) {
             res.statusCode = 200;
             res.end();
         });
-    } else if(req.method === 'GET' && req.url === '/api/codegen-done') {
+    } else if (req.method === 'GET' && req.url === '/api/codegen-done') {
         console.log('Codegen complete');
         console.log('Traces received:', tracesReceived);
 
@@ -71,106 +70,8 @@ server.listen(PORT);
 // open up browser window
 open('http://localhost:' + PORT + '/devtools/regl_codegen/index' + (strict ? '-strict' : '') + '.html');
 
-var devtoolsPath = path.join(constants.pathToRoot, 'devtools/regl_codegen');
-config.entryPoints = [path.join(devtoolsPath, 'devtools.js')];
-config.outfile = './build/regl_codegen-bundle.js';
-config.sourcemap = false;
-config.minify = false;
 await build(config);
 
-function getMockFiles() {
-    return new Promise(function(resolve, reject) {
-        fs.readdir(constants.pathToTestImageMocks, function(err, files) {
-            if(err) {
-                reject(err);
-            } else {
-                resolve(files);
-            }
-        });
-    });
-}
-
-function readFiles(files) {
-    var promises = files.map(function(file) {
-        var filePath = path.join(constants.pathToTestImageMocks, file);
-        return readFilePromise(filePath);
-    });
-
-    return Promise.all(promises);
-}
-
-function createMocksList(files) {
-    // eliminate pollutants (e.g .DS_Store) that can accumulate in the mock directory
-    var jsonFiles = files.filter(function(file) {
-        return file.name.substr(-5) === '.json';
-    });
-
-    var mocksList = jsonFiles.map(function(file) {
-        var contents = JSON.parse(file.contents);
-
-        // get plot type keywords from mocks
-        var types = contents.data.map(function(trace) {
-            return trace.type || 'scatter';
-        }).reduce(function(acc, type, i, arr) {
-            if(arr.lastIndexOf(type) === i) {
-                acc.push(type);
-            }
-            return acc;
-        }, []);
-
-        var filename = file.name.split(path.sep).pop();
-
-        return {
-            name: filename.slice(0, -5),
-            file: filename,
-            keywords: types.join(', ')
-        };
-    });
-
-    return mocksList;
-}
-
-function saveMockListToFile(mocksList) {
-    var filePath = path.join(constants.pathToBuild, 'test_dashboard_mocks.json');
-    var content = JSON.stringify(mocksList, null, 4);
-
-    return writeFilePromise(filePath, content);
-}
-
-function saveReglTracesToFile(traces) {
-    var filePath = path.join(constants.pathToBuild, 'regl_traces.json');
-    var content = JSON.stringify(traces, null, 4);
-
-    return writeFilePromise(filePath, content);
-}
-
-function readFilePromise(file) {
-    return new Promise(function(resolve, reject) {
-        fs.readFile(file, { encoding: 'utf-8' }, function(err, contents) {
-            if(err) {
-                reject(err);
-            } else {
-                resolve({
-                    name: file,
-                    contents: contents
-                });
-            }
-        });
-    });
-}
-
-function writeFilePromise(path, contents) {
-    return new Promise(function(resolve, reject) {
-        fs.writeFile(path, contents, function(err) {
-            if(err) {
-                reject(err);
-            } else {
-                resolve(path);
-            }
-        });
-    });
-}
-
 function handleCodegen(data) {
     var trace = data.trace;
     var generated = data.generated;
@@ -178,31 +79,23 @@ function handleCodegen(data) {
     var pathToReglCodegenSrc = constants.pathToReglCodegenSrc;
     var pathToReglPrecompiledSrc = path.join(constants.pathToSrc, 'traces', trace, 'regl_precompiled.js');
 
-    var header = [
-        '\'use strict\';',
-        '',
-    ].join('\n');
+    var header = ["'use strict';", ''].join('\n');
     var imports = '';
-    var exports = [
-        '',
-        '/* eslint-disable quote-props */',
-        'module.exports = {',
-        '',
-    ].join('\n');
+    var exports = ['', '/* eslint-disable quote-props */', 'module.exports = {', ''].join('\n');
     var varId = 0;
 
-    Object.entries(generated).forEach(function(kv) {
+    Object.entries(generated).forEach(function (kv) {
         var key = kv[0];
         var value = kv[1];
         var filePath = path.join(pathToReglCodegenSrc, key);
         fs.writeFileSync(filePath, 'module.exports = ' + value);
 
-        imports += 'var v' + varId + ' = require(\'../../' + path.join(constants.reglCodegenSubdir, key) + '\');\n';
-        exports += '    \'' + key + '\': v' + varId + ',\n';
+        imports += 'var v' + varId + " = require('../../" + path.join(constants.reglCodegenSubdir, key) + "');\n";
+        exports += "    '" + key + "': v" + varId + ',\n';
         varId++;
     });
 
-    if(varId > 0) {
+    if (varId > 0) {
         exports = exports.slice(0, -2) + '\n};\n';
     } else {
         exports = 'module.exports = {};\n';
diff --git a/devtools/test_dashboard/server.mjs b/devtools/test_dashboard/server.mjs
index b0adbd7ece4..f1c7ca071ed 100644
--- a/devtools/test_dashboard/server.mjs
+++ b/devtools/test_dashboard/server.mjs
@@ -1,15 +1,11 @@
-import fs from 'fs';
-import path  from 'path';
-import http from 'http';
 import ecstatic from 'ecstatic';
-import open from 'open';
+import { build, context } from 'esbuild';
+import http from 'http';
 import minimist from 'minimist';
-
+import open from 'open';
+import { devtoolsConfig, localDevConfig } from '../../esbuild-config.js';
 import constants from '../../tasks/util/constants.js';
-import { context, build } from 'esbuild';
-import config from '../../esbuild-config.js';
-
-import { glsl } from 'esbuild-plugin-glsl';
+import { createMocksList, getMockFiles, readFiles, saveMockListToFile } from '../dashboard_utilities.mjs';
 
 var args = minimist(process.argv.slice(2), {});
 var PORT = args.port || 3000;
@@ -17,46 +13,14 @@ var strict = args.strict;
 var mathjax3 = args.mathjax3;
 var mathjax3chtml = args.mathjax3chtml;
 
-if(strict) {
-    config.entryPoints = ['./lib/index-strict.js'];
-}
-
-config.outfile = './build/plotly.js';
-
-var mockFolder = constants.pathToTestImageMocks;
+if (strict) localDevConfig.entryPoints = ['./lib/index-strict.js'];
 
 // mock list
-await getMockFiles()
-    .then(readFiles)
-    .then(createMocksList)
-    .then(saveMockListToFile);
-
-// Devtools config
-var devtoolsConfig = {
-    entryPoints: [
-        path.join(constants.pathToRoot, 'devtools', 'test_dashboard', 'devtools.js')
-    ],
-    outfile: path.join(constants.pathToRoot, 'build', 'test_dashboard-bundle.js'),
-    format: 'cjs',
-    globalName: 'Tabs',
-    bundle: true,
-    minify: false,
-    sourcemap: false,
-    plugins: [
-        glsl({
-            minify: true,
-        }),
-    ],
-    define: {
-        global: 'window',
-    },
-    target: 'es2016',
-    logLevel: 'info',
-};
+await getMockFiles().then(readFiles).then(createMocksList).then(saveMockListToFile);
 
 build(devtoolsConfig);
 
-var ctx = await context(config);
+var ctx = await context(localDevConfig);
 devServer();
 console.log('watching esbuild...');
 await ctx.watch();
@@ -70,7 +34,7 @@ function devServer() {
     });
 
     const server = http.createServer((req, res) => {
-        if(strict) {
+        if (strict) {
             res.setHeader(
                 'Content-Security-Policy',
                 // Comment/uncomment for testing CSP. Changes require a server restart.
@@ -83,108 +47,22 @@ function devServer() {
                     // "connect-src 'self'",
                     // "object-src 'none'",
                     // "base-uri 'self';",
-                    "worker-src blob:",
-                ].join("; ")
-            )
+                    'worker-src blob:'
+                ].join('; ')
+            );
         }
 
-        staticFilesHandler(req, res)
-    })
+        staticFilesHandler(req, res);
+    });
 
     // Start the server up!
     server.listen(PORT);
 
     let indexName = 'index';
-    if(mathjax3) indexName += '-mathjax3'
-    else if(mathjax3chtml) indexName += '-mathjax3chtml'
-    indexName += '.html'
+    if (mathjax3) indexName += '-mathjax3';
+    else if (mathjax3chtml) indexName += '-mathjax3chtml';
+    indexName += '.html';
 
     // open up browser window
     open(`http://localhost:${PORT}/devtools/test_dashboard/${indexName}${strict ? '?strict=true' : ''}`);
 }
-
-function getMockFiles() {
-    return new Promise(function(resolve, reject) {
-        fs.readdir(mockFolder, function(err, files) {
-            if(err) {
-                reject(err);
-            } else {
-                resolve(files);
-            }
-        });
-    });
-}
-
-function readFiles(files) {
-    var promises = files.map(function(file) {
-        var filePath = path.join(mockFolder, file);
-        return readFilePromise(filePath);
-    });
-
-    return Promise.all(promises);
-}
-
-function createMocksList(files) {
-    // eliminate pollutants (e.g .DS_Store) that can accumulate in the mock directory
-    var jsonFiles = files.filter(function(file) {
-        return file.name.substr(-5) === '.json';
-    });
-
-    var mocksList = jsonFiles.map(function(file) {
-        var contents = JSON.parse(file.contents);
-
-        // get plot type keywords from mocks
-        var types = contents.data.map(function(trace) {
-            return trace.type || 'scatter';
-        }).reduce(function(acc, type, i, arr) {
-            if(arr.lastIndexOf(type) === i) {
-                acc.push(type);
-            }
-            return acc;
-        }, []);
-
-        var filename = file.name.split(path.sep).pop();
-
-        return {
-            name: filename.slice(0, -5),
-            file: filename,
-            keywords: types.join(', ')
-        };
-    });
-
-    return mocksList;
-}
-
-function saveMockListToFile(mocksList) {
-    var filePath = path.join(constants.pathToBuild, 'test_dashboard_mocks.json');
-    var content = JSON.stringify(mocksList, null, 4);
-
-    return writeFilePromise(filePath, content);
-}
-
-function readFilePromise(file) {
-    return new Promise(function(resolve, reject) {
-        fs.readFile(file, { encoding: 'utf-8' }, function(err, contents) {
-            if(err) {
-                reject(err);
-            } else {
-                resolve({
-                    name: file,
-                    contents: contents
-                });
-            }
-        });
-    });
-}
-
-function writeFilePromise(path, contents) {
-    return new Promise(function(resolve, reject) {
-        fs.writeFile(path, contents, function(err) {
-            if(err) {
-                reject(err);
-            } else {
-                resolve(path);
-            }
-        });
-    });
-}
diff --git a/esbuild-config.js b/esbuild-config.js
index 3f37992ec0a..77c6931cd48 100644
--- a/esbuild-config.js
+++ b/esbuild-config.js
@@ -1,30 +1,62 @@
-var glsl = require('esbuild-plugin-glsl').glsl;
-var environmentPlugin = require('esbuild-plugin-environment').environmentPlugin;
+const { environmentPlugin } = require('esbuild-plugin-environment');
+const { glsl } = require('esbuild-plugin-glsl');
 const InlineCSSPlugin = require('esbuild-plugin-inline-css');
+const path = require('path');
+const constants = require('./tasks/util/constants.js');
 
-module.exports = {
+// Default config used when building library
+const esbuildConfig = {
     entryPoints: ['./lib/index.js'],
     format: 'iife',
     globalName: 'Plotly',
     bundle: true,
     minify: false,
     sourcemap: false,
-    plugins: [
-        InlineCSSPlugin(),
-        glsl({
-            minify: true,
-        }),
-        environmentPlugin({
-            NODE_DEBUG: false,
-        }),
-    ],
+    plugins: [InlineCSSPlugin(), glsl({ minify: true }), environmentPlugin({ NODE_DEBUG: false })],
     alias: {
-        stream: 'stream-browserify',
+        stream: 'stream-browserify'
     },
     define: {
         global: 'window',
-        'define.amd': 'false',
+        'define.amd': 'false'
     },
     target: 'es2016',
-    logLevel: 'info',
+    logLevel: 'info'
+};
+
+// Config used when building bundle to serve test dashboard
+const devtoolsConfig = {
+    entryPoints: [path.join(constants.pathToRoot, 'devtools', 'test_dashboard', 'devtools.js')],
+    outfile: path.join(constants.pathToRoot, 'build', 'test_dashboard-bundle.js'),
+    format: 'cjs',
+    globalName: 'Tabs',
+    bundle: true,
+    minify: false,
+    sourcemap: false,
+    plugins: [glsl({ minify: true })],
+    define: { global: 'window' },
+    target: 'es2016',
+    logLevel: 'info'
+};
+
+// Config used when building plotly.js for local development
+const localDevConfig = {
+    ...esbuildConfig,
+    outfile: './build/plotly.js'
+};
+
+// Config used when building bundle to serve regl
+const localDevReglCodegenConfig = {
+    ...esbuildConfig,
+    entryPoints: [path.join(constants.pathToRoot, 'devtools/regl_codegen', 'devtools.js')],
+    outfile: './build/regl_codegen-bundle.js',
+    sourcemap: false,
+    minify: false
+};
+
+module.exports = {
+    devtoolsConfig,
+    esbuildConfig,
+    localDevConfig,
+    localDevReglCodegenConfig
 };
diff --git a/package.json b/package.json
index 32ca49508b7..d41047ca1cb 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "webpack": "./dist/plotly.js",
   "repository": {
     "type": "git",
-    "url": "https://github.com/plotly/plotly.js.git"
+    "url": "git+https://github.com/plotly/plotly.js.git"
   },
   "bugs": {
     "url": "https://github.com/plotly/plotly.js/issues"
diff --git a/tasks/schema.mjs b/tasks/schema.mjs
index 2c332afbe48..b4a335f99dc 100644
--- a/tasks/schema.mjs
+++ b/tasks/schema.mjs
@@ -1,36 +1,24 @@
+import { build } from 'esbuild';
 import fs from 'fs';
 import path from 'path';
+import { localDevConfig } from '../esbuild-config.js';
 
 import constants from './util/constants.js';
 import plotlyNode from './util/plotly_node.mjs';
 
-function caseInsensitive(a, b) {
-    return a.toLowerCase().localeCompare(b.toLowerCase());
-}
+const caseInsensitive = (a, b) => a.toLowerCase().localeCompare(b.toLowerCase());
 
-function isArray(v) {
-    return Array.isArray(v);
-}
+const { isArray } = Array;
 
-function isObject(v) {
-    return typeof v === 'object' && v !== null && !(isArray(v));
-}
+const isObject = (v) => typeof v === 'object' && v !== null && !isArray(v);
 
-function isArrayOfObjects(v) {
-    return isArray(v) && isObject(v[0]);
-}
+const isArrayOfObjects = (v) => isArray(v) && isObject(v[0]);
 
-function typeHandle(v) {
-    return (
-        isArrayOfObjects(v) ? sortArrayOfObjects(v) :
-        isObject(v) ? sortObject(v) :
-        v
-    );
-}
+const typeHandle = (v) => (isArrayOfObjects(v) ? sortArrayOfObjects(v) : isObject(v) ? sortObject(v) : v);
 
 function sortArrayOfObjects(list) {
-    var newList = [];
-    for(var i = 0; i < list.length; i++) {
+    const newList = [];
+    for (let i = 0; i < list.length; i++) {
         newList[i] = typeHandle(list[i]);
     }
 
@@ -38,12 +26,12 @@ function sortArrayOfObjects(list) {
 }
 
 function sortObject(obj) {
-    var allKeys = Object.keys(obj);
+    const allKeys = Object.keys(obj);
     allKeys.sort(caseInsensitive);
 
-    var newObj = {};
-    for(var i = 0; i < allKeys.length; i++) {
-        var key = allKeys[i];
+    const newObj = {};
+    for (let i = 0; i < allKeys.length; i++) {
+        const key = allKeys[i];
         newObj[key] = typeHandle(obj[key]);
     }
 
@@ -51,35 +39,34 @@ function sortObject(obj) {
 }
 
 function makeSchema(plotlyPath, schemaPath) {
-    var Plotly = plotlyNode(plotlyPath);
-
-    var obj = Plotly.PlotSchema.get();
-    var sortedObj = sortObject(obj);
-    var plotSchemaRaw = JSON.stringify(obj, null, 1);
-    var plotSchemaStr = JSON.stringify(sortedObj, null, 1);
+    const Plotly = plotlyNode(plotlyPath);
+    const obj = Plotly.PlotSchema.get();
+    const sortedObj = sortObject(obj);
+    const plotSchemaRaw = JSON.stringify(obj, null, 1);
+    const plotSchemaStr = JSON.stringify(sortedObj, null, 1);
 
     fs.writeFileSync(schemaPath, plotSchemaStr);
 
-    var lenBeforeSort = plotSchemaRaw.length;
-    var lenAfterSort = plotSchemaStr.length;
-    var linesBeforeSort = plotSchemaRaw.split('\n').length;
-    var linesAfterSort = plotSchemaStr.split('\n').length;
-    if(linesAfterSort !== linesBeforeSort || lenAfterSort !== lenBeforeSort) {
+    const lenBeforeSort = plotSchemaRaw.length;
+    const lenAfterSort = plotSchemaStr.length;
+    const linesBeforeSort = plotSchemaRaw.split('\n').length;
+    const linesAfterSort = plotSchemaStr.split('\n').length;
+    if (linesAfterSort !== linesBeforeSort || lenAfterSort !== lenBeforeSort) {
         throw 'plot schema should have the same length & number of lines before and after sort';
     } else {
         console.log('ok ' + path.basename(schemaPath));
     }
 }
 
-var isDist = process.argv.indexOf('dist') !== -1;
+const isDist = process.argv.indexOf('dist') !== -1;
+
+const pathToSchema = isDist ? constants.pathToSchemaDist : constants.pathToSchemaDiff;
 
-var pathToSchema = isDist ?
-    constants.pathToSchemaDist :
-    constants.pathToSchemaDiff;
+const pathToPlotly = isDist ? constants.pathToPlotlyDistWithMeta : constants.pathToPlotlyBuild;
 
-var pathToPlotly = isDist ?
-    constants.pathToPlotlyDistWithMeta :
-    constants.pathToPlotlyBuild;
+// Build plotly.js to ensure changes to attributes are picked up. This is the same
+// process used in the test dashboard server script, but run only once.
+await build(localDevConfig);
 
 // output plot-schema JSON
 makeSchema(pathToPlotly, pathToSchema);
diff --git a/tasks/util/bundle_wrapper.mjs b/tasks/util/bundle_wrapper.mjs
index 561588a58f5..a4cb0d43e62 100644
--- a/tasks/util/bundle_wrapper.mjs
+++ b/tasks/util/bundle_wrapper.mjs
@@ -4,7 +4,7 @@ import prependFile from 'prepend-file';
 
 import { build } from 'esbuild';
 
-import esbuildConfig from '../../esbuild-config.js';
+import { esbuildConfig } from '../../esbuild-config.js';
 import esbuildPluginStripMeta from '../../tasks/compress_attributes.js';
 
 import common from './common.js';
@@ -35,17 +35,17 @@ export default async function _bundle(pathToIndex, pathToBundle, opts, cb) {
     config.outfile = pathToBundle;
     config.minify = !!opts.minify;
 
-    if(!opts.noCompressAttributes) {
+    if (!opts.noCompressAttributes) {
         config.plugins = basePlugins.concat([esbuildPluginStripMeta]);
     }
 
-    if(opts.noPlugins) config.plugins = [];
+    if (opts.noPlugins) config.plugins = [];
 
     await build(config);
 
     addWrapper(pathToBundle);
 
-    if(cb) cb();
+    if (cb) cb();
 }
 
 // Until https://github.com/evanw/esbuild/pull/513 is merged
@@ -67,14 +67,5 @@ function addWrapper(path) {
         common.throwOnError
     );
 
-    fsExtra.appendFile(
-        path,
-        [
-            '',
-            'window.Plotly = Plotly;',
-            'return Plotly;',
-            '}));',
-        ].join('\n'),
-        common.throwOnError
-    );
+    fsExtra.appendFile(path, ['', 'window.Plotly = Plotly;', 'return Plotly;', '}));'].join('\n'), common.throwOnError);
 }
diff --git a/test/jasmine/karma.conf.js b/test/jasmine/karma.conf.js
index b1f52a8306d..c82cc9bfba6 100644
--- a/test/jasmine/karma.conf.js
+++ b/test/jasmine/karma.conf.js
@@ -3,7 +3,7 @@
 var path = require('path');
 var minimist = require('minimist');
 var constants = require('../../tasks/util/constants');
-var esbuildConfig = require('../../esbuild-config.js');
+const { esbuildConfig } = require('../../esbuild-config.js');
 
 var isCI = Boolean(process.env.CI);
 
@@ -12,17 +12,24 @@ var argv = minimist(process.argv.slice(4), {
     boolean: [
         'mathjax3',
         'info',
-        'nowatch', 'randomize',
-        'failFast', 'doNotFailOnEmptyTestSuite',
-        'Chrome', 'Firefox',
-        'verbose', 'showSkipped', 'report-progress', 'report-spec', 'report-dots'
+        'nowatch',
+        'randomize',
+        'failFast',
+        'doNotFailOnEmptyTestSuite',
+        'Chrome',
+        'Firefox',
+        'verbose',
+        'showSkipped',
+        'report-progress',
+        'report-spec',
+        'report-dots'
     ],
     alias: {
         Chrome: 'chrome',
         Firefox: ['firefox', 'FF'],
         bundleTest: ['bundletest', 'bundle_test'],
         nowatch: 'no-watch',
-        failFast: 'fail-fast',
+        failFast: 'fail-fast'
     },
     default: {
         info: false,
@@ -37,78 +44,80 @@ var argv = minimist(process.argv.slice(4), {
     }
 });
 
-if(argv.info) {
-    console.log([
-        'plotly.js karma runner for jasmine tests CLI info',
-        '',
-        'Examples:',
-        '',
-        'Run `axes_test.js`, `bar_test.js` and `scatter_test.js` suites w/o `autoWatch`:',
-        '  $ npm run test-jasmine -- axes bar_test.js scatter --nowatch',
-        '',
-        'Run all tests with the `noCI` tag on Firefox in a 1500px wide window:',
-        '  $ npm run test-jasmine -- --tags=noCI --FF --width=1500',
-        '',
-        'Arguments:',
-        '  - All non-flagged arguments corresponds to the test suites in `test/jasmine/tests/` to be run.',
-        '    No need to add the `_test.js` suffix, we expand them correctly here.',
-        '  - `--bundleTest` set the bundle test suite `test/jasmine/bundle_tests/ to be run.',
-        '    Note that only one bundle test can be run at a time.',
-        '  - Use `--tags` to specify which `@` tags to test (if any) e.g `npm run test-jasmine -- --tags=gl`',
-        '    will run only gl tests.',
-        '  - Use `--skip-tags` to specify which `@` tags to skip (if any) e.g `npm run test-jasmine -- --skip-tags=gl`',
-        '    will skip all gl tests.',
-        '',
-        'Other options:',
-        '  - `--info`: show this info message',
-        '  - `--mathjax3`: to load mathjax v3 in relevant test',
-        '  - `--Chrome` (alias `--chrome`): run test in (our custom) Chrome browser',
-        '  - `--Firefox` (alias `--FF`, `--firefox`): run test in (our custom) Firefox browser',
-        '  - `--nowatch (dflt: `false`, `true` on CI)`: run karma w/o `autoWatch` / multiple run mode',
-        '  - `--randomize` (dflt: `false`): randomize test ordering (useful to detect bad test teardown)',
-        '  - `--failFast` (dflt: `false`): exit karma upon first test failure',
-        '  - `--doNotFailOnEmptyTestSuite` (dflt: `false`): do not fail run when no spec are ran (either from bundle error OR tag filtering)',
-        '  - `--tags`: run only test with given tags (using the `jasmine-spec-tags` framework)',
-        '  - `--width`(dflt: 1035): set width of the browser window',
-        '  - `--height` (dflt: 617): set height of the browser window',
-        '  - `--verbose` (dflt: `false`): show test result using verbose reporter',
-        '  - `--showSkipped` show tests that are skipped',
-        '  - `--report-progress`: use *progress* reporter',
-        '  - `--report-spec`: use *spec* reporter',
-        '  - `--report-dots`: use *dots* reporter',
-        '',
-        'For info on the karma CLI options run `npm run test-jasmine -- --help`'
-    ].join('\n'));
+if (argv.info) {
+    console.log(
+        [
+            'plotly.js karma runner for jasmine tests CLI info',
+            '',
+            'Examples:',
+            '',
+            'Run `axes_test.js`, `bar_test.js` and `scatter_test.js` suites w/o `autoWatch`:',
+            '  $ npm run test-jasmine -- axes bar_test.js scatter --nowatch',
+            '',
+            'Run all tests with the `noCI` tag on Firefox in a 1500px wide window:',
+            '  $ npm run test-jasmine -- --tags=noCI --FF --width=1500',
+            '',
+            'Arguments:',
+            '  - All non-flagged arguments corresponds to the test suites in `test/jasmine/tests/` to be run.',
+            '    No need to add the `_test.js` suffix, we expand them correctly here.',
+            '  - `--bundleTest` set the bundle test suite `test/jasmine/bundle_tests/ to be run.',
+            '    Note that only one bundle test can be run at a time.',
+            '  - Use `--tags` to specify which `@` tags to test (if any) e.g `npm run test-jasmine -- --tags=gl`',
+            '    will run only gl tests.',
+            '  - Use `--skip-tags` to specify which `@` tags to skip (if any) e.g `npm run test-jasmine -- --skip-tags=gl`',
+            '    will skip all gl tests.',
+            '',
+            'Other options:',
+            '  - `--info`: show this info message',
+            '  - `--mathjax3`: to load mathjax v3 in relevant test',
+            '  - `--Chrome` (alias `--chrome`): run test in (our custom) Chrome browser',
+            '  - `--Firefox` (alias `--FF`, `--firefox`): run test in (our custom) Firefox browser',
+            '  - `--nowatch (dflt: `false`, `true` on CI)`: run karma w/o `autoWatch` / multiple run mode',
+            '  - `--randomize` (dflt: `false`): randomize test ordering (useful to detect bad test teardown)',
+            '  - `--failFast` (dflt: `false`): exit karma upon first test failure',
+            '  - `--doNotFailOnEmptyTestSuite` (dflt: `false`): do not fail run when no spec are ran (either from bundle error OR tag filtering)',
+            '  - `--tags`: run only test with given tags (using the `jasmine-spec-tags` framework)',
+            '  - `--width`(dflt: 1035): set width of the browser window',
+            '  - `--height` (dflt: 617): set height of the browser window',
+            '  - `--verbose` (dflt: `false`): show test result using verbose reporter',
+            '  - `--showSkipped` show tests that are skipped',
+            '  - `--report-progress`: use *progress* reporter',
+            '  - `--report-spec`: use *spec* reporter',
+            '  - `--report-dots`: use *dots* reporter',
+            '',
+            'For info on the karma CLI options run `npm run test-jasmine -- --help`'
+        ].join('\n')
+    );
     process.exit(0);
 }
 
 var SUFFIX = '_test.js';
-var basename = function(s) { return path.basename(s, SUFFIX); };
-var merge = function(_) {
+var basename = function (s) {
+    return path.basename(s, SUFFIX);
+};
+var merge = function (_) {
     var list = [];
 
-    (Array.isArray(_) ? _ : [_]).forEach(function(p) {
+    (Array.isArray(_) ? _ : [_]).forEach(function (p) {
         list = list.concat(p.split(','));
     });
 
     return list;
 };
-var glob = function(_) {
-    return _.length === 1 ?
-        _[0] + SUFFIX :
-        '{' + _.join(',') + '}' + SUFFIX;
+var glob = function (_) {
+    return _.length === 1 ? _[0] + SUFFIX : '{' + _.join(',') + '}' + SUFFIX;
 };
 
 var isBundleTest = !!argv.bundleTest;
 var isFullSuite = !isBundleTest && argv._.length === 0;
 var testFileGlob;
 
-if(isFullSuite) {
+if (isFullSuite) {
     testFileGlob = path.join(__dirname, 'tests', '*' + SUFFIX);
-} else if(isBundleTest) {
+} else if (isBundleTest) {
     var _ = merge(argv.bundleTest);
 
-    if(_.length > 1) {
+    if (_.length > 1) {
         console.warn('Can only run one bundle test suite at a time, ignoring ', _.slice(1));
     }
 
@@ -124,15 +133,15 @@ var pathToMathJax3 = path.join(__dirname, '..', '..', 'node_modules', '@plotly/m
 var pathToVirtualWebgl = path.join(__dirname, '..', '..', 'node_modules', 'virtual-webgl', 'src', 'virtual-webgl.js');
 
 var reporters = [];
-if(argv['report-progress'] || argv['report-spec'] || argv['report-dots']) {
-    if(argv['report-progress']) reporters.push('progress');
-    if(argv['report-spec']) reporters.push('spec');
-    if(argv['report-dots']) reporters.push('dots');
+if (argv['report-progress'] || argv['report-spec'] || argv['report-dots']) {
+    if (argv['report-progress']) reporters.push('progress');
+    if (argv['report-spec']) reporters.push('spec');
+    if (argv['report-dots']) reporters.push('dots');
 } else {
-    if(isCI) {
+    if (isCI) {
         reporters.push('spec');
     } else {
-        if(isFullSuite) {
+        if (isFullSuite) {
             reporters.push('dots');
         } else {
             reporters.push('progress');
@@ -142,10 +151,10 @@ if(argv['report-progress'] || argv['report-spec'] || argv['report-dots']) {
 
 var hasSpecReporter = reporters.indexOf('spec') !== -1;
 
-if(!hasSpecReporter && argv.showSkipped) reporters.push('spec');
-if(argv.verbose) reporters.push('verbose');
+if (!hasSpecReporter && argv.showSkipped) reporters.push('spec');
+if (argv.verbose) reporters.push('verbose');
 
-if(process.argv.indexOf('--tags=noCI,noCIdep') !== -1) {
+if (process.argv.indexOf('--tags=noCI,noCIdep') !== -1) {
     reporters = ['dots'];
 }
 
@@ -169,7 +178,6 @@ function func(config) {
 }
 
 func.defaultConfig = {
-
     // base path that will be used to resolve all patterns (eg. files, exclude)
     basePath: constants.pathToRoot,
 
@@ -184,7 +192,7 @@ func.defaultConfig = {
         require('karma-spec-reporter'),
         require('karma-chrome-launcher'),
         require('karma-firefox-launcher'),
-        require('karma-esbuild'),
+        require('karma-esbuild')
     ],
 
     // list of files / patterns to load in the browser
@@ -194,9 +202,9 @@ func.defaultConfig = {
         pathToCustomMatchers,
         // available to fetch from /base/node_modules/@plotly/mathjax-v2/
         // more info: http://karma-runner.github.io/3.0/config/files.html
-        {pattern: pathToMathJax2 + '/**', included: false, watched: false, served: true},
-        {pattern: pathToMathJax3 + '/**', included: false, watched: false, served: true},
-        {pattern: pathToTopojsonDist + '/**', included: false, watched: false, served: true}
+        { pattern: pathToMathJax2 + '/**', included: false, watched: false, served: true },
+        { pattern: pathToMathJax3 + '/**', included: false, watched: false, served: true },
+        { pattern: pathToTopojsonDist + '/**', included: false, watched: false, served: true }
     ],
 
     // list of files / pattern to exclude
@@ -253,7 +261,7 @@ func.defaultConfig = {
                 '--touch-events',
                 '--window-size=' + argv.width + ',' + argv.height,
                 isCI ? '--ignore-gpu-blacklist' : '',
-                (isBundleTest && basename(testFileGlob) === 'no_webgl') ? '--disable-webgl' : ''
+                isBundleTest && basename(testFileGlob) === 'no_webgl' ? '--disable-webgl' : ''
             ]
         },
         _Firefox: {
@@ -318,11 +326,9 @@ func.defaultConfig = {
 func.defaultConfig.preprocessors[pathToCustomMatchers] = ['esbuild'];
 func.defaultConfig.preprocessors[testFileGlob] = ['esbuild'];
 
-if(argv.virtualWebgl) {
+if (argv.virtualWebgl) {
     // add virtual-webgl to the top
-    func.defaultConfig.files = [
-        pathToVirtualWebgl
-    ].concat(func.defaultConfig.files);
+    func.defaultConfig.files = [pathToVirtualWebgl].concat(func.defaultConfig.files);
 }
 
 // lastly, load test file glob
@@ -330,8 +336,8 @@ func.defaultConfig.files.push(testFileGlob);
 
 // add browsers
 var browsers = func.defaultConfig.browsers;
-if(argv.Chrome) browsers.push('_Chrome');
-if(argv.Firefox) browsers.push('_Firefox');
-if(browsers.length === 0) browsers.push('_Chrome');
+if (argv.Chrome) browsers.push('_Chrome');
+if (argv.Firefox) browsers.push('_Firefox');
+if (browsers.length === 0) browsers.push('_Chrome');
 
 module.exports = func;