message: [improvement] support functional component model prop
diff: @@ -11,20 +11,31 @@ import Vue, {
  RenderContext
  } from 'vue/types';
  import { VNode, ScopedSlot } from 'vue/types/vnode';
  +import { InjectOptions, PropsDefinition } from 'vue/types/options';
  type VantComponentOptions = ComponentOptions<Vue> & {
  functional?: boolean;
  install?: (Vue: VueConstructor) => void;
  };
  -type VantPureComponent = {
  +type DefaultProps = Record<string, any>;
  +
  +type VantPureComponent<
  + Props = DefaultProps,
  + PropDefs = PropsDefinition<Props>
  +> = {
  (
  h: CreateElement,
  props: { [key: string]: any },
  slots: { [key: string]: ScopedSlot | undefined },
  context: RenderContext
  ): VNode;
  - props: any;
  + props?: PropDefs;
  + model?: {
  + prop?: string;
  + event?: string;
  + };
  + inject?: InjectOptions;
  };
  const arrayProp = {
  @@ -73,6 +84,7 @@ function transformPureComponent(pure: VantPureComponent): VantComponentOptions {
  return {
  functional: true,
  props: pure.props,
  + model: pure.model,
  render: (h, context) => pure(h, context.props, unifySlots(context), context)
  };
  }
  