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import { curry } from './curry.js'
export function mergeWithFn(  mergeFn, aInput, bInput){  const a = aInput ?? {}  const b = bInput ?? {}  const willReturn = {}
  Object.keys(a).forEach(key => {    if (b[ key ] === undefined) willReturn[ key ] = a[ key ]    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])  })
  Object.keys(b).forEach(key => {    if (willReturn[ key ] !== undefined) return
    if (a[ key ] === undefined) willReturn[ key ] = b[ key ]    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])  })
  return willReturn}
export const mergeWith = curry(mergeWithFn)