Storybook Core-server

This package contains common node-side functionality used among the different frameworks (React, RN, Vue, Ember, Angular, etc).

It contains:

CLI arg parsing
Storybook UI "manager" webpack configuration
start-storybook dev server
build-storybook static builder
presets handling

The "preview" (aka iframe) side is implemented in pluggable builders:

@storybook/builder-webpack5

These builders abstract both the webpack dependencies as well as the various core configurations and loader/plugin dependencies provided out of the box with Storybook.