fix(types): make VNodeDirective properties optional, fix vuejs#8013 (vuejs#8003)

Author: KaelWD

types/options.d.ts

@@ -160,9 +160,13 @@ export interface WatchOptionsWithHandler<T> extends WatchOptions {
   handler: WatchHandler<T>;
 }
 
+export interface DirectiveBinding extends Readonly<VNodeDirective> {
+  readonly modifiers: { [key: string]: boolean };
+}
+
 export type DirectiveFunction = (
   el: HTMLElement,
-  binding: VNodeDirective,
+  binding: DirectiveBinding,
   vnode: VNode,
   oldVnode: VNode
 ) => void;

types/test/options-test.ts

@@ -154,6 +154,10 @@ Vue.component('component', {
       props: {
         myProp: "bar"
       },
+      directives: [{
+        name: 'a',
+        value: 'foo'
+      }],
       domProps: {
         innerHTML: "baz"
       },

types/vnode.d.ts

@@ -58,10 +58,10 @@ export interface VNodeData {
 }
 
 export interface VNodeDirective {
-  readonly name: string;
-  readonly value: any;
-  readonly oldValue: any;
-  readonly expression: any;
-  readonly arg: string;
-  readonly modifiers: { [key: string]: boolean };
+  name: string;
+  value?: any;
+  oldValue?: any;
+  expression?: any;
+  arg?: string;
+  modifiers?: { [key: string]: boolean };
 }