Expected Behavior

notistack installs without warning.

Current Behavior

Yarn Modern warns about a missing peer dependency:

➤ YN0002: │ notistack@npm:3.0.1 [cf7a2] doesn't provide csstype (p96778), requested by goober

Steps to Reproduce

Install notistack in a project using Yarn Modern.

Context

This article by the maintainer of Yarn explains why this is an issue that should be fixed.

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