Typescript array of key value pairs declaration -

confused following declaration:

constructor(controls: {[key: string]: abstractcontrol}, optionals?: {[key: string]: boolean}, validator?: validatorfn, asyncvalidator?: asyncvalidatorfn) 

what type of controls (first parameter)? object array of key value pairs key string , value abstractcontrol? thanks!

yes, guessed, it's js object key string , abstractcontrol values.
example:

{     "control1": new control(),     "control2": new control() } 

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edit

you can declare variable of type in 2 ways:

let controls: { [key: string]: abstractcontrol }; 

or

interface controlsmap {     [key: string]: abstractcontrol; }  let controls: controlsmap; 

or better:

interface controlsmap<t extends abstractcontrol> {     [key: string]: t; }  let controls1: controlsmap<abstractcontrol>; let controls2: controlsmap<mycontrol>;