Form #

type Arrayable<T> = T | T[]

type FormValidationResult = Promise<boolean>

// ValidateFieldsError: see [async-validator](https://github.com/yiminghe/async-validator/blob/master/src/interface.ts)
type FormValidateCallback = (
  isValid: boolean,
  invalidFields?: ValidateFieldsError
) => Promise<void> | void

// RuleItem: see [async-validator](https://github.com/yiminghe/async-validator/blob/master/src/interface.ts)
interface FormItemRule extends RuleItem {
  trigger?: Arrayable<string>
}

type Primitive = null | undefined | string | number | boolean | symbol | bigint
type BrowserNativeObject = Date | FileList | File | Blob | RegExp
type IsTuple<T extends ReadonlyArray<any>> = number extends T['length']
  ? false
  : true
type ArrayMethodKey = keyof any[]
type TupleKey<T extends ReadonlyArray<any>> = Exclude<keyof T, ArrayMethodKey>
type ArrayKey = number
type PathImpl<K extends string | number, V> = V extends
  | Primitive
  | BrowserNativeObject
  ? `${K}`
  : `${K}` | `${K}.${Path<V>}`
type Path<T> = T extends ReadonlyArray<infer V>
  ? IsTuple<T> extends true
    ? {
        [K in TupleKey<T>]-?: PathImpl<Exclude<K, symbol>, T[K]>
      }[TupleKey<T>]
    : PathImpl<ArrayKey, V>
  : {
      [K in keyof T]-?: PathImpl<Exclude<K, symbol>, T[K]>
    }[keyof T]
type FieldPath<T> = T extends object ? Path<T> : never
// MaybeRef: see [@vueuse/core](https://github.com/vueuse/vueuse/blob/main/packages/shared/utils/types.ts)
// UnwrapRef: see [vue](https://github.com/vuejs/core/blob/main/packages/reactivity/src/ref.ts)
type FormRules<T extends MaybeRef<Record<string, any> | string> = string> =
  Partial<
    Record<
      UnwrapRef<T> extends string ? UnwrapRef<T> : FieldPath<UnwrapRef<T>>,
      Arrayable<FormItemRule>
    >
  >

type FormItemValidateState = typeof formItemValidateStates[number]
type FormItemProps = ExtractPropTypes<typeof formItemProps>

type FormItemContext = FormItemProps & {
  $el: HTMLDivElement | undefined
  size: ComponentSize
  validateState: FormItemValidateState
  isGroup: boolean
  labelId: string
  inputIds: string[]
  hasLabel: boolean
  fieldValue: any
  addInputId: (id: string) => void
  removeInputId: (id: string) => void
  validate: (
    trigger: string,
    callback?: FormValidateCallback
  ) => FormValidationResult
  resetField(): void
  clearValidate(): void
}