How to get Emmet to generate a custom JSX attribute without quotes
To get single quotes working with JSX you will need to update or create the syntaxProfiles.json in ~/emmet with the syntax profile. I believe that the key is the file extension and the value is the name of the profile that extension will use.
/* ~/emmet/syntaxProfiles.json */
/* 'js' will map files with .js extension to use the js profile*//* 'jsx' will map files with .jsx extension to also use the js profile*/
{ "js": "js", "jsx": "js"}/* ~/emmet/profiles.json */
/* create or add the 'js' profile */
{ "html": { "attr_quotes": "double" }, "js": { "attr_quotes": "single", "self_closing_tag": true }}