feat(Intl.RelativeTimeFormat): strongly typed options

Author: glennsl

src/intl/Core__Intl__RelativeTimeFormat.res

@@ -1,19 +1,26 @@
 type t
 
+type options = {
+  localeMathcer?: [#lookup | #"best fit"],
+  numberingSystem?: string,
+  style?: [#long | #short | #narrow],
+  numeric?: [#always | #auto],
+}
+
 @new external make: unit => t = "Intl.RelativeTimeFormat"
 @new external makeWithLocale: string => t = "Intl.RelativeTimeFormat"
 @new external makeWithLocales: array<string> => t = "Intl.RelativeTimeFormat"
-@new external makeWithLocaleAndOptions: (string, {..}) => t = "Intl.RelativeTimeFormat"
-@new external makeWithLocalesAndOptions: (array<string>, {..}) => t = "Intl.RelativeTimeFormat"
-@new external makeWithOptions: (@as(json`undefined`) _, {..}) => t = "Intl.RelativeTimeFormat"
+@new external makeWithLocaleAndOptions: (string, options) => t = "Intl.RelativeTimeFormat"
+@new external makeWithLocalesAndOptions: (array<string>, options) => t = "Intl.RelativeTimeFormat"
+@new external makeWithOptions: (@as(json`undefined`) _, options) => t = "Intl.RelativeTimeFormat"
 
 @val
 external supportedLocalesOf: array<string> => t = "Intl.RelativeTimeFormat.supportedLocalesOf"
 @val
-external supportedLocalesOfWithOptions: (array<string>, {..}) => t =
+external supportedLocalesOfWithOptions: (array<string>, options) => t =
   "Intl.RelativeTimeFormat.supportedLocalesOf"
 
-@send external resolvedOptions: t => {..} = "resolvedOptions"
+@send external resolvedOptions: t => options = "resolvedOptions"
 
 type timeUnit = [#year | #quarter | #month | #week | #day | #hour | #minute | #second]