import { Engine , uuid4 } from 'random-js' ; /**
 * A function to produce a random value.
 */ export type Generator < ValueT > = ( engine : Engine , locale ? : string ) => ValueT ; /**
 * A function to produce a Generator.
 */ export type Gen < ValueT , GenOptsT > = ( genOpts ? : GenOptsT ) => Generator < ValueT > ; export function mkGen < V , O > ( generator ) { return ( opts ) => generator ; } /**
 * A function to transform produced value.
 */ export type ValueTransform < FromValueT , TargetValueT > = ( v : FromValueT , engine : Engine , locale : string ) => TargetValueT ; /**
 * A function to transform Gen A to Gen B.
 */ export type GenTransform < FromValueT , FromGenOptsT , TargetValueT , TargetGenOptsT > = ( gen : Gen < FromValueT , FromGenOptsT > ) => Gen < TargetValueT , TargetGenOptsT > ; /**
 * A function to transform GenOpts A to GenOpts B.
 */ export type GenOptsTransform < FromGenOptsT , TargetGenOptsT > = ( genOpts : FromGenOptsT | null ) => TargetGenOptsT ; /**
 * Promote a pure function as GenTransform.
 */ export function promote < FV , FO , TV > ( f ) { return ( gen ) => { return ( genOpts ) => { return ( engine , locale ) => { return f ( gen ( genOpts ) ( engine , locale ) , engine , locale ) ; } ; } ; } ; } /**
 * A function to test a value.
 */ export type ValuePredication < V > = ( v : V ) => boolean ; /**
 * Transform predicate function as SuchThatGenTransform.
 */ export function suchThat < FV , FO > ( predicate ) { return gen => ( opts ) => { return ( engine , locale ) => { let x ; let j = 0 ; for ( let i = 0 ; ; i ++ ) { j ++ ; if ( i > 5 ) { i = 0 ; } x = gen ( opts ) ( engine , locale ) ; if ( j > 5000 ) { throw new Error ( 'cant not find value in this range' ) ; } if ( predicate ( x ) ) { break ; } } return x ; } ; } ; }