typescript - Infer the type of object keys -

is possible in typescript declare structure type of function assigned error key in jquery.ajax inferred? report on type mismatch if 1 tries assign wrong function signature.

$.ajax({     type: "post",     url: listurl,     jsonp: 'jsonp',     datatype: "jsonp",     success: onsuccescall,     error: onerrorcall });  function onerrorcall(jqxhr, textstatus, errorthrown) {     ... } 

this should done already, limited extent (limited the definition using , jquery api full of optionality).

var listurl = 'http://www.example.com/'; function onsuccesscall (data, thing: boolean, another: boolean) {     // implementation }  function onerrorcall () {     // implementation }  $.ajax({     type: "post",     url: listurl,     jsonp: 'jsonp',     datatype: "jsonp",     success: onsuccesscall,     error: onerrorcall }); 

in above example, onsuccesscall cause typescript issue warning not have signature compatible success property, expects (data:any, textstatus: string, jqxhr: jqueryxhr) => any.

note supply function omits of these , compatible (because don't have argument passed).