this is likely due to the fact that chrome.devtools.panels.elements.createSidebarPane isn't currently included in the api-metadata.json:

webextension-polyfill/api-metadata.json

Lines 206 to 221 in 8c7be46

    
           "devtools": { 
        
             "inspectedWindow": { 
        
               "eval": { 
        
                 "minArgs": 1, 
        
                 "maxArgs": 2, 
        
                 "singleCallbackArg": false 
        
               } 
        
             }, 
        
             "panels": { 
        
               "create": { 
        
                 "minArgs": 3, 
        
                 "maxArgs": 3, 
        
                 "singleCallbackArg": true 
        
               } 
        
             } 
        
           },

and so it doesn't get wrapped as a promise-based API method.

	"devtools": {
	"inspectedWindow": {
	"eval": {
	"minArgs": 1,
	"maxArgs": 2,
	"singleCallbackArg": false
	}
	},
	"panels": {
	"create": {
	"minArgs": 3,
	"maxArgs": 3,
	"singleCallbackArg": true
	}
	}
	},

browser.devtools.panels.elements.createSidebarPane('Gem') return undefined on Chrome #246

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