import * as R from "react" ; type CopyFunction < TFn , TR > = TFn extends ( ... a : infer A ) => any ? ( ... a : A ) => TR : string ; type Translations < TGroup > = { [ group in keyof TGroup ] : { [ key in keyof TGroup [ group ] ] : CopyFunction < TGroup [ group ] [ key ] , string > ; } ; } ; type Options < TValue > = { language : keyof TValue ; fallback : keyof TValue ; } ; type TranslationsObject < TGroup , TValue > = { translations : Translations < TGroup > ; use : ( ) => Translations < TGroup > ; useOptions : ( ) => Options < TValue > ; setOptions : ( options : Options < TValue > ) => any ; getOptions : ( ) => Options < TValue > ; } ; type SubscriberFunc = ( n : number ) => any ; type val < T > = ( ... params : any [ ] ) => T ; type val1 < T > = T ; type TranslationInput < TValue > = { [ group ] : { [ key ] : val < TValue > | val1 < TValue > ; } ; } ; type TranslationLanguagesInput = { [ language ] : string ; } ; export function createTranslations < TValue extends TranslationLanguagesInput > ( ) { return function < TGroup extends TranslationInput < TValue > > ( t , po ) : TranslationsObject < TGroup , TValue > { let sb = [ ] ; let o = po ; let et = { } ; function gen ( ) { Object . keys ( t ) . forEach ( g => { et [ g ] = { } ; Object . keys ( t [ g ] ) . forEach ( k => { let tv = t [ g ] [ k ] ; et [ g ] [ k ] = tv instanceof Function ? ( ... p ) => { let z = ( tv as Function ) ( ... p ) ; return z [ o . language ] || z [ o . fallback ] ; } : tv [ o . language ] || tv [ o . fallback ] ; } ) ; } ) ; } function setOptions ( op ) { o = op ; gen ( ) ; sb . forEach ( ( c ) => c ( ( p ) => p + 1 ) ) ; } function subscribe ( ) { let [ , s ] = R . useState < number > ( 0 ) ; R . useEffect ( ( ) => { sb . push ( s ) ; return ( ) => { sb = sb . filter ( ( f ) => f !== s ) ; } ; } , [ s ] ) ; } function use ( ) { subscribe ( ) ; return et ; } function useOptions ( ) { subscribe ( ) ; return o ; } gen ( ) ; return { translations : et , getOptions : ( ) => o , setOptions , useOptions , use , } ; } ; }