Support WebAssembly as asynchronous EcmaScript Module.
Enable backward-compat layer with deprecation warnings for many webpack 4 APIs.
Enable additional in memory caching of modules that are unchanged and reference only unchanged modules.
Apply defaults of next major version.
Enable module layers.
Allow output javascript files as module source type.
Support WebAssembly as synchronous EcmaScript Module (outdated).
Allow using top-level-await in EcmaScript Modules.
Enables/Disables experiments (experimental features with relax SemVer compatibility).