feat(FileData): add isFileData

src/FileData.ts

@@ -1,4 +1,10 @@
+import isObject from './isObject'
+
+const flag = 0x666
+
 export default class FileData<T = any> {
+  private readonly $$instanceOf = flag
+
   private content: T
 
   /**
@@ -18,4 +24,14 @@ export default class FileData<T = any> {
   public get(): T {
     return this.content
   }
+
+  /**
+   * 检查值是否是 FileData。
+   *
+   * @param value 要检查的值
+   * @returns 是（true）或否（false）
+   */
+  public static isFileData(value: any): boolean {
+    return isObject(value) && (value as any).$$instanceOf === flag
+  }
 }

test/index.test.ts

@@ -1390,7 +1390,10 @@ describe('isChineseName', () => {
 describe('FileData', () => {
   test('ok', () => {
     [1, true, /x/, {}].forEach(item => {
-      expect(new vtils.FileData(item).get()).toBe(item)
+      expect(vtils.FileData.isFileData(item)).toBeFalsy()
+      const fileData = new vtils.FileData(item)
+      expect(fileData.get()).toBe(item)
+      expect(vtils.FileData.isFileData(fileData)).toBeTruthy()
     })
   })
 })