Are there examples of emissiveMap somewhere? I could find any in the Three.js website example, or I just don’t know what to search for.
From a technical point of view - aren’t basic material examples equivalent to emissive map 
? The final effect should be quite similar - since there’s no actual light emitted, just shades made brighter 
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^Good point!
A couple of the glTF examples have emissive maps on PBR materials too:
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