props.ts — vue Source File

Source Code

import { warn } from './debug'
import { observe, toggleObserving, shouldObserve } from '../observer/index'
import {
  hasOwn,
  isArray,
  isObject,
  isFunction,
  toRawType,
  hyphenate,
  capitalize,
  isPlainObject
} from 'shared/util'
import type { Component } from 'types/component'

type PropOptions = {
  type: Function | Array<Function> | null
  default: any
  required?: boolean
  validator?: Function
}

export function validateProp(
  key: string,
  propOptions: Object,
  propsData: Object,
  vm?: Component
): any {
  const prop = propOptions[key]
  const absent = !hasOwn(propsData, key)
  let value = propsData[key]
  // boolean casting
  const booleanIndex = getTypeIndex(Boolean, prop.type)
  if (booleanIndex > -1) {
    if (absent && !hasOwn(prop, 'default')) {
      value = false
    } else if (value === '' || value === hyphenate(key)) {
      // only cast empty string / same name to boolean if
      // boolean has higher priority
      const stringIndex = getTypeIndex(String, prop.type)
      if (stringIndex < 0 || booleanIndex < stringIndex) {
        value = true
      }
    }
  }
  // check default value
  if (value === undefined) {
    value = getPropDefaultValue(vm, prop, key)
    // since the default value is a fresh copy,
    // make sure to observe it.
    const prevShouldObserve = shouldObserve
    toggleObserving(true)
    observe(value)
    toggleObserving(prevShouldObserve)
  }
  if (__DEV__) {
    assertProp(prop, key, value, vm, absent)
  }
  return value
}

// ... (195 more lines)