Broken dependency tree - core-js@2.6.12: core-js@<3 is no longer maintained

Hey all, just wanted to leave a note here for all future learners.

As of March 2021, npm install breaks down with an exit code after hanging on the following line:

npm WARN deprecated core-js@2.6.12: core-js@<3 is no longer maintained and not recommended for usage due to the number of issues. Please, upgrade your dependencies to the actual version of core-js@3

Here's how to fix it:

1. start clean --> delete node_modules folder and/or package-lock.json, if you have them.

In command line, run:

2. npm install --package-lock-only
3. npm audit fix --force
4. npm install

Happy testing,
Sean

The issue names no repository file or test; start by running npm install and observing the core-js@2.6.12 warning and failure. Inspect the dependency manifests and lockfile to locate the source of core-js 2, then verify that a clean install completes without the deprecated dependency warning.

Written by the indexing model from the issue text.