housekeeping: address inconsistently truncated JS asset responses within Cypress tests (via #5445)

* add Cypress error trace

* Update package.json

* Update webpack-hot-dev-server.config.js

* Update index.js

* Update index.js

package.json

@@ -37,7 +37,7 @@
     "test-e2e-selenium": "sleep 3 && nightwatch test/e2e-selenium/scenarios/ --config test/e2e-selenium/nightwatch.json",
     "e2e-initial-render": "nightwatch test/e2e-selenium/scenarios/ --config test/e2e-selenium/nightwatch.json --group initial-render",
     "mock-api": "json-server --watch test/e2e-selenium/db.json --port 3204",
-    "hot-e2e-cypress-server": "webpack-dev-server --port 3230 --content-base test/e2e-cypress/static --host 0.0.0.0 --config webpack-hot-dev-server.config.js --inline --hot --progress",
+    "hot-e2e-cypress-server": "webpack-dev-server --port 3230 --content-base test/e2e-cypress/static --host 0.0.0.0 --config webpack-hot-dev-server.config.js",
     "hot-e2e-selenium-server": "webpack-dev-server --port 3230 --content-base test/e2e-selenium/helpers --host 0.0.0.0 --config webpack-hot-dev-server.config.js --inline --hot --progress",
     "e2e-cypress": "run-p -r hot-e2e-cypress-server mock-api test-e2e-cypress",
     "e2e-selenium": "run-p -r hot-e2e-selenium-server mock-api test-e2e-selenium",

test/e2e-cypress/support/index.js

@@ -1,3 +1,5 @@
+import fs from "fs"
+
 // ***********************************************************
 // This example support/index.js is processed and
 // loaded automatically before your test files.
@@ -24,4 +26,12 @@ import "./commands"
 // see https://github.com/cypress-io/cypress/issues/95
 Cypress.on("window:before:load", win => {
   win.fetch = null
-})
+})
+
+Cypress.on("uncaught:exception", (err, runnable) => {
+  console.log(err)
+  console.log(JSON.stringify(err, null, 2))
+  fs.writeFileSync(require("path").normalize(__dirname, "./error.log"), JSON.stringify(err, null, 2))
+
+  throw err
+})

webpack-hot-dev-server.config.js

@@ -65,7 +65,6 @@ module.exports = require("./make-webpack-config")(rules, {
     port: 3200,
     publicPath: "/",
     noInfo: true,
-    hot: true,
     disableHostCheck: true, // for development within VMs
     stats: {
       colors: true