grunt generate-sources is failing with 'cannot find modules' and syntax error - gruntjs

Question

Hi All,
We are facing an issue with mvn install where grunt generate-sources is failing with 'cannot find modules' error, for example it says node modules findup-sync, ini, has...etc, if we install these node modules separately there are some other modules which are missing and throwing below errors
**module not found error**:
Executing command line: /appserver/jenkins/workspace/project/./node_modules/.bin/grunt generate-sources --verbose
module.js:478
throw err;
Error: Cannot find module 'findup-sync'
at Function.Module./_resolveFilename (module.js:476:15)
at Function.Module./_load (module.js:424:25)
at Module.require (module.js:504:17)
at require (internal/module.js:20:19)
at Object./ (/appserver/jenkins/workspace/project/node_modules/grunt-cli/bin/grunt:8:14)
at Module./_compile (module.js:577:32)
at Object.Module./_extensions..js (module.js:586:10)
at Module.load (module.js:494:32)
at tryModuleLoad (module.js:453:12)
at Function.Module./_load (module.js:445:3)
**Syntax error**:
Executing command line: grunt.cmd generate-sources --verbose
C:/Users/AppData/Roaming/nvm/v6.14.4/node_modules/npm/node_modules/grunt-cli/node_modules/micromatch/index.js:44
let isMatch = picomatch(String(patterns[i]), { ...options, onResult }, true);
SyntaxError: Unexpected token ...
at createScript (vm.js:56:10)
at Object.runInThisContext (vm.js:97:10)
at Module._compile (module.js:549:28)
at Object.Module._extensions..js (module.js:586:10)
at Module.load (module.js:494:32)
at tryModuleLoad (module.js:453:12)
at Function.Module._load (module.js:445:3)
at Module.require (module.js:504:17)
at require (internal/module.js:20:19)
at Object. (C:/Users/AppData/Roaming/nvm/v6.14.4/node_modules/npm/node_modules/grunt-cli/node_modules/findup-sync/index.js:12:10)
The same build was working last month without any changes to code and configuration, but now it's failing with the above mentioned errors, below are the version details
npm#3.10.10
node#v6.14.4
Could you please let me know what might cause this issue and how to resolve, thanks a lot in advance!
I have tried below steps:
Tried with different node versions 6.14.4, 6.17.1, 10.13.0
Tried with different grunt-cli versions 0.1.13, 1.0.2, 1.4.2, when we are running with different grunt cli versions we are seeing different node modules are missing
Tried removing node modules and install again
Tried installing missing node modules, if we install one, then it's giving some other module is missing
npm install findup-sync -g
npm link findup-sync
npm install grunt-cli -g