v6.2.0-alpha.9

Features

• Web-components: Add typescript types and CLI template (#12395)

Bug Fixes

• Addon-docs: Fix angular without compodoc (#13487)
• Core: Use fs-extra emptyDir so build works on docker volume (#13474)
• Addon-docs: Tighten preset webpack pattern for mdx stories (#13476)
• Svelte: Statically load docgen info for svelte components (#13466)

Dependency Upgrades

• Bump @ember/optional-features from 1.3.0 to 2.0.0 (#12829)