What do these two messages mean? mangle parameter and headerIds

[shacaranda]

marked(): mangle parameter is enabled by default, but is deprecated since version 5.0.0, and will be removed in the future. To clear this warning, install https://www.npmjs.com/package/marked-mangle, or disable by setting {mangle: false}.

marked(): headerIds and headerPrefix parameters enabled by default, but are deprecated since version 5.0.0, and will be removed in the future. To clear this warning, install https://www.npmjs.com/package/marked-gfm-heading-id, or disable by setting {headerIds: false}.

The content of my markdown file is just "# hello world" for a test. What is the mangle parameter in marked and what is headerIds?

[UziTech]

see https://marked.js.org/using_advanced#options