JavaScript heap out of memory in Angular 7 using Azure DevOps

Try to run prod build like this:

node --max_old_space_size=5048 ./node_modules/@angular/cli/bin/ng build --prod

I have the same error yesterday and it's helps me to avoid it.

Temporary solution to fix JavaScript heap memory issues are

ng node --max_old_space_size=4096 && ng build --prod

You can add more space as well

ng node --max_old_space_size=8192 && ng build --prod

Or disable AOT itself

ng build --prod --aot=false --build-optimizer=false

If you have problem with running the application using ng serve itself then use below command

node --max_old_space_size=8048 ./node_modules/@angular/cli/bin/ng serve

But my suggestion is to cross check your application design and verify all module import, external libraries are imported correctly. make sure there is no duplicate imports. Use shared module for all reusable components etc More info