Function initProps

packages/runtime-core/src/componentProps.ts:194–232

(
  instance: ComponentInternalInstance,
  rawProps: Data | null,
  isStateful: number, // result of bitwise flag comparison
  isSSR = false,
)

export type NormalizedPropsOptions = [NormalizedProps, string[]] | []

export function initProps(
  instance: ComponentInternalInstance,
  rawProps: Data | null,
  isStateful: number, // result of bitwise flag comparison
  isSSR = false,
): void {
  const props: Data = {}
  const attrs: Data = createInternalObject()

  instance.propsDefaults = Object.create(null)

  setFullProps(instance, rawProps, props, attrs)

  // ensure all declared prop keys are present
  for (const key in instance.propsOptions[0]) {
    if (!(key in props)) {
      props[key] = undefined
    }
  }

  // validation
  if (__DEV__) {
    validateProps(rawProps || {}, props, instance)
  }

  if (isStateful) {
    // stateful
    instance.props = isSSR ? props : shallowReactive(props)
  } else {
    if (!instance.type.props) {
      // functional w/ optional props, props === attrs
      instance.props = attrs
    } else {
      // functional w/ declared props
      instance.props = props
    }
  }
  instance.attrs = attrs
}

function isInHmrContext(instance: ComponentInternalInstance | null) {
  while (instance) {