I have made the decision to completely stop supporting outdated browsers and discontinue support for ES5 compilation/polyfills.
Currently, my Angular project code is compiled with approximately 85% coverage as shown below:
"compilerOptions": {
"target": "es2016",
"module": "es2020",
"lib": [
"es2019",
"dom"
These options dictate how the project's code behaves.
However, it is worth noting that Angular libraries are compiled to ES2015.
The question remains: How can we compile our project's VENDOR packages to ES2016/17/18/19/20?
UPDATE: Find the answer on stackoverflow.com/a/68294105/1440240.