## Environment Wepack 4 Web version 3.0.3 ## Description  Deepmerge is distributed as CJS and UMD, however, you import the UMD (heavier version) ## Reproducible Demo <!-- Let us know how to reproduce the issue. Include a code sample or share a project that reproduces the issue. Please follow the guidelines for providing a minimal example: https://stackoverflow.com/help/mcve. --> not necessary