Errors began after updating to Angular-Cli V10.1.0. Initial problems I encountered: The ng command was not working. I found that core dependencies were missing:
word-2016
proguard-maven-plugin
aquafold
whitespace-language
sql-server-2005
timeval
turtle-graphics
liferay-7
rmagick
autokey
area-chart
caeagllayer
email-client
android-calendar
malware
drag-to-select
sublime-build
icomparable
easy-digital-downloads
mathematical-morphology
checksum
faircom
visionkit
amd-processor
gtmetrix
imeoptions
attiny
protractor
mongoose-populate
index-sequence