Features

• optimization.sideEffects will detect simple cases of modules without side effects from the source code now
  • supported: class and function declarations, variable declarations with pure init expression, if, while, for, switch, export, import, function calls with pure flag
• added a "transitive only" side effects mode which drops the module but keeps dependencies
  • This is useful for mini-css-extract-plugin to allow droping the extracted JS, while keeping the CSS dependencies

Bugfixes

• accessing properties of the prototype from imported modules is now possible. They are no longer incorrectly mangled.

Dependencies

• update schema-utils to major 3
• update acorn to major 8