List all attachments that are not linked anywhere

List all not referenced attachments

Basic

const allNonMdFiles = app.vault.getFiles().filter(file => file.extension !== 'md')
const allNonMdOutlinks = dv.pages().file.outlinks.path.filter(link => !link.endsWith('.md'))
const notReferenced = allNonMdFiles.filter(file => !allNonMdOutlinks.includes(file.path));

dv.list(dv.array(notReferenced).map(link => dv.fileLink(link.path)))

Variants

Be able to specify file endings to ignore and show a callout if no result is found

// add all extensions you want to ignore to the array, i.e. ["md", "js", "css"]
const allNonMdFiles = app.vault.getFiles().filter(file => !["md"].includes(file.extension))
const allNonMdOutlinks = dv.pages().file.outlinks.path.filter(link => !link.endsWith('.md'))
const notReferenced = allNonMdFiles.filter(file => !allNonMdOutlinks.includes(file.path));

if (!notReferenced.length) {
    dv.span(`> [!done] All good! No unused attachments found :) `)
} 

dv.list(dv.array(notReferenced).map(link => dv.fileLink(link.path)))