fix(breadcrumb): update size prop type and add validator (#3037)

examples/sites/demos/apis/breadcrumb.js

@@ -41,7 +41,7 @@ export default {
         },
         {
           name: 'size',
-          type: 'string',
+          type: "'medium'",
           defaultValue: "'medium'",
           desc: {
             'zh-CN': '设置面包屑尺寸大小',
@@ -107,7 +107,7 @@ export default {
         },
         {
           name: 'size',
-          type: 'string',
+          type: "'medium'",
           defaultValue: "'medium'",
           desc: {
             'zh-CN': '设置面包屑尺寸大小',

packages/vue/src/breadcrumb-item/src/index.ts

@@ -19,7 +19,11 @@ export const breadcrumbItemProps = {
     type: Boolean,
     default: false
   },
-  size: String,
+  size: {
+    type: String,
+    default: '',
+    validator: (val: string) => [/* 'large', */ 'medium', /* 'small', 'mini',  */ ''].includes(val)
+  },
   option: {
     type: Object,
     default: () => ({})

packages/vue/src/breadcrumb/src/index.ts

@@ -35,7 +35,11 @@ export const breadcrumbProps = {
     type: String,
     default: 'label'
   },
-  size: String,
+  size: {
+    type: String,
+    default: '',
+    validator: (val: string) => [/* 'large', */ 'medium', /* 'small', 'mini',  */ ''].includes(val)
+  },
   options: {
     type: Array,
     default: () => []