fast-iot-web/src/utils/props.ts

// copy from element-plus

import { warn } from 'vue'
import { isObject } from '@/utils/is'
import { fromPairs } from 'lodash-es'
import type { ExtractPropTypes } from 'vue'
import type { Mutable } from './types'

const wrapperKey = Symbol()
export type PropWrapper<T> = { [wrapperKey]: T }

export const propKey = Symbol()

type ResolveProp<T> = ExtractPropTypes<{
  key: { type: T; required: true }
}>['key']
type ResolvePropType<T> = ResolveProp<T> extends { type: infer V } ? V : ResolveProp<T>
type ResolvePropTypeWithReadonly<T> = Readonly<T> extends Readonly<Array<infer A>> ? ResolvePropType<A[]> : ResolvePropType<T>

type IfUnknown<T, V> = [unknown] extends [T] ? V : T

export type BuildPropOption<T, D extends BuildPropType<T, V, C>, R, V, C> = {
  type?: T
  values?: readonly V[]
  required?: R
  default?: R extends true ? never : D extends Record<string, unknown> | Array<any> ? () => D : (() => D) | D
  validator?: ((val: any) => val is C) | ((val: any) => boolean)
}

type _BuildPropType<T, V, C> =
  | (T extends PropWrapper<unknown> ? T[typeof wrapperKey] : [V] extends [never] ? ResolvePropTypeWithReadonly<T> : never)
  | V
  | C
export type BuildPropType<T, V, C> = _BuildPropType<IfUnknown<T, never>, IfUnknown<V, never>, IfUnknown<C, never>>

type _BuildPropDefault<T, D> = [T] extends [
  // eslint-disable-next-line @typescript-eslint/ban-types
  Record<string, unknown> | Array<any> | Function
]
  ? D
  : D extends () => T
  ? ReturnType<D>
  : D

export type BuildPropDefault<T, D, R> = R extends true
  ? { readonly default?: undefined }
  : {
      readonly default: Exclude<D, undefined> extends never ? undefined : Exclude<_BuildPropDefault<T, D>, undefined>
    }
export type BuildPropReturn<T, D, R, V, C> = {
  readonly type: PropType<BuildPropType<T, V, C>>
  readonly required: IfUnknown<R, false>
  readonly validator: ((val: unknown) => boolean) | undefined
  [propKey]: true
} & BuildPropDefault<BuildPropType<T, V, C>, IfUnknown<D, never>, IfUnknown<R, false>>

/**
 * @description Build prop. It can better optimize prop types
 * @description 生成 prop，能更好地优化类型
 * @example
  // limited options
  // the type will be PropType<'light' | 'dark'>
  buildProp({
    type: String,
    values: ['light', 'dark'],
  } as const)
  * @example
  // limited options and other types
  // the type will be PropType<'small' | 'medium' | number>
  buildProp({
    type: [String, Number],
    values: ['small', 'medium'],
    validator: (val: unknown): val is number => typeof val === 'number',
  } as const)
  @link see more: https://github.com/element-plus/element-plus/pull/3341
 */
export function buildProp<T = never, D extends BuildPropType<T, V, C> = never, R extends boolean = false, V = never, C = never>(
  option: BuildPropOption<T, D, R, V, C>,
  key?: string
): BuildPropReturn<T, D, R, V, C> {
  // filter native prop type and nested prop, e.g `null`, `undefined` (from `buildProps`)
  if (!isObject(option) || !!option[propKey]) return option as any

  const { values, required, default: defaultValue, type, validator } = option

  const _validator =
    values || validator
      ? (val: unknown) => {
          let valid = false
          let allowedValues: unknown[] = []

          if (values) {
            allowedValues = [...values, defaultValue]
            valid ||= allowedValues.includes(val)
          }
          if (validator) valid ||= validator(val)

          if (!valid && allowedValues.length > 0) {
            const allowValuesText = [...new Set(allowedValues)].map((value) => JSON.stringify(value)).join(', ')
            warn(
              `Invalid prop: validation failed${
                key ? ` for prop "${key}"` : ''
              }. Expected one of [${allowValuesText}], got value ${JSON.stringify(val)}.`
            )
          }
          return valid
        }
      : undefined

  return {
    type: typeof type === 'object' && type && Object.getOwnPropertySymbols(type).includes(wrapperKey) ? type[wrapperKey] : type,
    required: !!required,
    default: defaultValue,
    validator: _validator,
    [propKey]: true
  } as unknown as BuildPropReturn<T, D, R, V, C>
}

type NativePropType = [((...args: any) => any) | { new (...args: any): any } | undefined | null]

export const buildProps = <
  O extends {
    [K in keyof O]: O[K] extends BuildPropReturn<any, any, any, any, any>
      ? O[K]
      : [O[K]] extends NativePropType
      ? O[K]
      : O[K] extends BuildPropOption<infer T, infer D, infer R, infer V, infer C>
      ? D extends BuildPropType<T, V, C>
        ? BuildPropOption<T, D, R, V, C>
        : never
      : never
  }
>(
  props: O
) =>
  fromPairs(Object.entries(props).map(([key, option]) => [key, buildProp(option as any, key)])) as unknown as {
    [K in keyof O]: O[K] extends { [propKey]: boolean }
      ? O[K]
      : [O[K]] extends NativePropType
      ? O[K]
      : O[K] extends BuildPropOption<
          infer T,
          // eslint-disable-next-line @typescript-eslint/no-unused-vars
          infer _D,
          infer R,
          infer V,
          infer C
        >
      ? BuildPropReturn<T, O[K]['default'], R, V, C>
      : never
  }

export const definePropType = <T>(val: any) => ({ [wrapperKey]: val } as PropWrapper<T>)

export const keyOf = <T>(arr: T) => Object.keys(arr as any) as Array<keyof T>
export const mutable = <T extends readonly any[] | Record<string, unknown>>(val: T) => val as Mutable<typeof val>

export const componentSize = ['large', 'medium', 'small', 'mini'] as const