Para criar tags a partir de arquivos Javascript, adicione o próximo snippet a ~/.ctags.
Embora me dê um erro ctags: Warning: Ignoring non-option in /home/orangetux/.ctags, funciona. Eu encontrei no Gist .
--langdef=js
--langmap=js:.js
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*{/5/,object/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*function[ t]*(/5/,function/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*[/5/,array/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*[^"]'[^']*/5/,string/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*(true|false)/5/,boolean/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*[0-9]+/5/,number/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*=[ t]*.+([,;=]|$)/5/,variable/
--regex-js=/(,|(;|^)[ t]*(var|let|([A-Za-z_$][A-Za-z0-9_$.]+.)*))[ t]*([A-Za-z0-9_$]+)[ t]*[ t]*([,;]|$)/5/,variable/
--regex-js=/function[ t]+([A-Za-z0-9_$]+)[ t]*([^)]*)/1/,function/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*{/2/,object/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*function[ t]*(/2/,function/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*[/2/,array/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*[^"]'[^']*/2/,string/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*(true|false)/2/,boolean/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*[0-9]+/2/,number/
--regex-js=/(,|^)[ t]*([A-Za-z_$][A-Za-z0-9_$]+)[ t]*:[ t]*[^=]+([,;]|$)/2/,variable/