high95%
@next/mdx: unhandled promise rejection when plugin path fails to resolve in mdx-js-loader
In @next/mdx, the mdx-js-loader uses getOptions() which returns a Promise. The Promise lacks a .catch(), so if a plugin path fails to resolve (e.g. missing module, ESM import failure), the rejection is unhandled. This causes webpack's build to hang without a clear error, instead of forwarding the error to webpack's callback.