Unrecognized plugin format; can't find plugin.id {src: 'external.js'}

[fswijmans]

Adding the plugin gives me the following errror in the console of chrome devtools:

plugins.js:195 Unrecognized plugin format; can't find plugin.id {src: 'plugin/external/external.js', condition: ƒ}

I'm running Reveal.js fresh from git, and updated gulp to v4.x.x as I'm running on Node v16:

$ node -v
v16.15.1

The result is that an empty slide is added to my deck:

<section data-external="/intro.html"></section>

[Marlaqk]

Did you copy the plugin file node_modules/reveal_external/external/external.js to plugin/external/external.js?