UnhandledPromiseRejectionWarning during quasar dev (happens when creating project using latest Node)

[hsalis]

Describe the bug
Creating a new Quasar project using Quasar CLI while running Node 15.x triggers a UnhandledPromiseRejectionWarning when running Quasar dev.

To Reproduce
Steps to reproduce the behavior:

1. Install Node 15.x and Quasar CLI
2. quasar create
3. cd and quasar dev
4. Output and Error are:

Dev mode.......... spa
Pkg quasar........ v1.14.2
Pkg @quasar/app... v2.1.5
Debugging......... enabled

Configured browser support (at least 87.77% of global marketshare):
· Chrome for Android >= 85
· Firefox for Android >= 79
· Android >= 81
· Chrome >= 76
· Edge >= 83
· Firefox >= 72
· iOS >= 10.3
· Opera >= 67
· Safari >= 11

App · Reading quasar.conf.js
App · Checking listening address availability (0.0.0.0:8080)...
App · Transpiling JS (Babel active)
App · Extending SPA Webpack config
App · Generating Webpack entry point
App · Booting up...
(node:55337) [DEP_WEBPACK_RULE_LOADER_OPTIONS_STRING] DeprecationWarning: Using a string as loader options is deprecated (ruleSet[0].rules[0].use[0].options)
(node:55337) UnhandledPromiseRejectionWarning: Error: Rule can only have one resource source (provided resource and test + include + exclude) in {
"exclude": [
null
],
"use": [
{
"loader": "babel-loader",
"options": {
"compact": false,
"extends": "/babel.config.js"
},
"ident": "clonedRuleSet-2[0].rules[0].use[0]"
}
]
}

Expected behavior
App · Opening default browser at http://localhost:8080

Platform (please complete the following information):
OS: MacOSx
Node: 15.x

SOLUTION
Solution: Delete the entire Quasar project, install Node 12.x and recreate the Quasar project.

However, the issue was not resolved by simply uninstalling Node 15.x, installing Node 12.x, deleting node_modules & reinstalling dependencies, and then running quasar dev.

[hsalis]

Solution is above, but Googling was not helpful, so paying it forward to the next new Quasar user.

[rstoenescu]

Please use Node 12 LTS. Any newer version of Node has issues with webpack 4, including problems related to file watchers.