An older Node application fails to deploy to Heroku with this error:

npm ERR! The `npm ci` command can only install with an existing package-lock.json or
remote npm-shrinkwrap.json with lockfileVersion >= 1

but I have a package-lock.json with:

  "lockfileVersion": 2,

so I’m guessing this is some underlying issue with an unhelpful message. I’ve tried different versions of Node and NPM though I can’t go above Node 12 without making updates to this legacy application…which I’d r e a a a l l y like to avoid.

Any ideas on how to tickle this away?

Full Error

remote: Building source:
remote: 
remote: -----> Building on the Heroku-22 stack
remote: -----> Using buildpack: heroku/nodejs
remote: -----> Node.js app detected
remote:        
remote: -----> Creating runtime environment
remote:        
remote:        NPM_CONFIG_LOGLEVEL=error
remote:        NODE_VERBOSE=false
remote:        NODE_ENV=production
remote:        NODE_MODULES_CACHE=true
remote:        
remote: -----> Installing binaries
remote:        engines.node (package.json):  15.3.0
remote:        engines.npm (package.json):   7.0.14
remote:        
remote:        Resolving node version 15.3.0...
remote:        Downloading and installing node 15.3.0...
remote:        npm 7.0.14 already installed with node
remote:        
remote: -----> Restoring cache
remote:        Cached directories were not restored due to a change in version of node, npm, yarn or stack
remote:        Module installation may take longer for this build
remote:        
remote: -----> Prebuild
remote:        Running heroku-prebuild
remote:        
remote:        > snazzywiz@2.1.1 heroku-prebuild
remote:        > npm --global install pushstate-server@3.0.1; npm --global install @angular/cli
remote:        
remote:        
remote:        added 44 packages, and audited 44 packages in 3s
remote:        
remote:        10 vulnerabilities (5 low, 3 moderate, 2 high)
remote:        
remote:        To address issues that do not require attention, run:
remote:          npm audit fix
remote:        
remote:        To address all issues, run:
remote:          npm audit fix --force
remote:        
remote:        Run `npm audit` for details.
remote:        
remote:        added 209 packages, and audited 209 packages in 8s
remote:        
remote:        25 packages are looking for funding
remote:          run `npm fund` for details
remote:        
remote:        found 0 vulnerabilities
remote: npm notice 
remote: npm notice New major version of npm available! 7.0.14 -> 8.19.2
remote: npm notice Changelog: <https://github.com/npm/cli/releases/tag/v8.19.2>
remote: npm notice Run `npm install -g npm@8.19.2` to update!
remote: npm notice 
remote:        
remote: -----> Installing dependencies
remote:        Installing node modules
remote:        npm ERR! The `npm ci` command can only install with an existing package-lock.json or
remote:        npm ERR! npm-shrinkwrap.json with lockfileVersion >= 1. Run an install with npm@5 or
remote:        npm ERR! later to generate a package-lock.json file, then try again.
remote:        
remote:        npm ERR! A complete log of this run can be found in:
remote:        npm ERR!     /tmp/npmcache.ULXke/_logs/2022-09-17T19_15_54_600Z-debug.log
remote: 
remote: -----> Build failed