How to add externally_connectable?, since it's only in chrome, and give the error

[MoriorInvictus]

I need to add externally_connectable to my extension manifest, but all they give me an error, that it's not described in webextension-polyfill, how to disable that? what if I make an extension specifically for chromium since it's just a joke to create an extension that I'm making, make it for firefox, this extension is for the game, and playing any game in something except chromium is shooting into yourself.

externally_connectable: { matches: ["*://*.lol.com/*"] }

[seomikewaltman]

I just extended the manifest interface like this on manifest.ts

interface WebExtensionExternal extends Manifest.WebExtensionManifest {
    externally_connectable: {
        matches: string[]
    }
    key?: string
}