Even though I am using target esm2015, ivy is compiles as a esm5 module

For me this started showing after upgrading to Angular 9, and adding

"postinstall": "ngcc"

to scripts in package.json fixed it.

ok,i, found it, in webpack i had to set [ 'es2015', 'browser', 'module', 'main'],,

https://github.com/angular/angular/issues/31853#issuecomment-515406475