How to use the @vue/shared.isString function in @vue/shared

function matches(pattern: MatchPattern, name: string): boolean {
  if (isArray(pattern)) {
    return (pattern as any).some((p: string | RegExp) => matches(p, name))
  } else if (isString(pattern)) {
    return pattern.split(',').indexOf(name) > -1
  } else if (pattern.test) {
    return pattern.test(name)
  }
  /* istanbul ignore next */
  return false
}

patchFlag: number = 0,
  dynamicProps: string[] | null = null
): VNode {
  if (__DEV__ && !type) {
    warn(`Invalid vnode type when creating vnode: ${type}.`)
    type = Comment
  }

  // class & style normalization.
  if (props !== null) {
    // for reactive or proxy objects, we need to clone it to enable mutation.
    if (isReactive(props) || SetupProxySymbol in props) {
      props = extend({}, props)
    }
    let { class: klass, style } = props
    if (klass != null && !isString(klass)) {
      props.class = normalizeClass(klass)
    }
    if (style != null) {
      // reactive state objects need to be cloned since they are likely to be
      // mutated
      if (isReactive(style) && !isArray(style)) {
        style = extend({}, style)
      }
      props.style = normalizeStyle(style)
    }
  }

  // encode the vnode type information into a bitmap
  const shapeFlag = isString(type)
    ? ShapeFlags.ELEMENT
    : __FEATURE_SUSPENSE__ && (type as any).__isSuspense === true

function genNodeList(
  nodes: (string | symbol | CodegenNode | TemplateChildNode[])[],
  context: CodegenContext,
  multilines: boolean = false
) {
  const { push, newline } = context
  for (let i = 0; i < nodes.length; i++) {
    const node = nodes[i]
    if (isString(node)) {
      push(node)
    } else if (isArray(node)) {
      genNodeListAsArray(node, context)
    } else {
      genNode(node, context)
    }
    if (i < nodes.length - 1) {
      if (multilines) {
        push(',')
        newline()
      } else {
        push(', ')
      }
    }
  }
}

export function createObjectProperty(
  key: Property['key'] | string,
  value: Property['value']
): Property {
  return {
    type: NodeTypes.JS_PROPERTY,
    loc: locStub,
    key: isString(key) ? createSimpleExpression(key, true) : key,
    value
  }
}

function formatProps(props: Data) {
  const res = []
  for (const key in props) {
    const value = props[key]
    if (isString(value)) {
      res.push(`${key}=${JSON.stringify(value)}`)
    } else {
      res.push(`${key}=`, value)
    }
  }
  return res
}

export function initializeWatch(
  instance: ComponentInstance,
  options: ComponentWatchOptions | undefined
) {
  if (options !== void 0) {
    for (const key in options) {
      const opt = options[key]
      if (isArray(opt)) {
        opt.forEach(o => setupWatcher(instance, key, o))
      } else if (isFunction(opt)) {
        setupWatcher(instance, key, opt)
      } else if (isString(opt)) {
        setupWatcher(instance, key, (instance as any)[opt])
      } else if (opt.handler) {
        setupWatcher(instance, key, opt.handler, opt)
      }
    }
  }
}

function genCallExpression(node: CallExpression, context: CodegenContext) {
  const callee = isString(node.callee)
    ? node.callee
    : context.helper(node.callee)
  context.push(callee + `(`, node)
  genNodeList(node.arguments, context)
  context.push(`)`)
}

export function normalizePropsOptions(
  raw: ComponentPropsOptions | void
): NormalizedPropsOptions | void {
  if (!raw) {
    return
  }
  const normalized: NormalizedPropsOptions = {}
  if (isArray(raw)) {
    for (let i = 0; i < raw.length; i++) {
      if (__DEV__ && !isString(raw[i])) {
        warn(`props must be strings when using array syntax.`, raw[i])
      }
      const normalizedKey = camelize(raw[i])
      if (!isReservedKey(normalizedKey)) {
        normalized[normalizedKey] = EMPTY_OBJ
      } else if (__DEV__) {
        warn(`Invalid prop name: "${normalizedKey}" is a reserved property.`)
      }
    }
  } else {
    if (__DEV__ && !isObject(raw)) {
      warn(`invalid props options`, raw)
    }
    for (const key in raw) {
      const normalizedKey = camelize(key)
      if (!isReservedKey(normalizedKey)) {

function normalizePropsOptions(
  raw: ComponentPropsOptions | void
): NormalizedPropsOptions {
  if (!raw) {
    return [] as any
  }
  if (normalizationMap.has(raw)) {
    return normalizationMap.get(raw)!
  }
  const options: NormalizedPropsOptions[0] = {}
  const needCastKeys: NormalizedPropsOptions[1] = []
  if (isArray(raw)) {
    for (let i = 0; i < raw.length; i++) {
      if (__DEV__ && !isString(raw[i])) {
        warn(`props must be strings when using array syntax.`, raw[i])
      }
      const normalizedKey = camelize(raw[i])
      if (normalizedKey[0] !== '$') {
        options[normalizedKey] = EMPTY_OBJ
      } else if (__DEV__) {
        warn(`Invalid prop name: "${normalizedKey}" is a reserved property.`)
      }
    }
  } else {
    if (__DEV__ && !isObject(raw)) {
      warn(`invalid props options`, raw)
    }
    for (const key in raw) {
      const normalizedKey = camelize(key)
      if (normalizedKey[0] !== '$') {