Add typescript support

index.d.ts

@@ -0,0 +1,55 @@
+import Vue from 'vue'
+  
+// Instance / File
+global {
+  namespace VueUpload {
+    interface File {
+      readonly fileObject: boolean
+      id: string | number
+      size: number
+      name: string
+      type: string
+      active: boolean
+      error: string
+      success: boolean
+      putAction: string
+      postAction: string
+      headers: object
+      data: object
+      timeout: number
+      response: object | string
+      progress: string
+      speed: number
+      xhr: XMLHttpRequest
+      iframe: Element
+    }
+  }
+}
+
+interface VueUploadComponent extends Vue, Element {
+  // Instance / Methods
+  get(id: VueUpload.File | object | string): VueUpload.File | object | boolean
+  add(files: Array<VueUpload.File | File | object> | VueUpload.File | File | object): object | Array<VueUpload.File | object> | boolean
+  addInputFile(el: HTMLInputElement): Array<VueUpload.File>
+  addDataTransfer(dataTransfer: DataTransfer): Promise<Array<VueUpload.File>>
+  update(id: VueUpload.File | object | string, data: object): object | boolean
+  // remove(id: VueUpload.File | object | string): object | boolean // Types are incompatible with Element
+  replace(id1: VueUpload.File | object | string, id2: VueUpload.File | object | string): boolean
+  clear(): boolean
+
+  // Instance / Data
+  readonly files: Array<VueUpload.File>
+  readonly features: { html5?: boolean; directory?: boolean; drag?: boolean }
+  active: boolean
+  readonly dropActive: true
+  readonly uploaded: true
+}
+
+// module 'vue/types/vue' {
+  // https://stackoverflow.com/a/41286276/5221998
+  // interface Vue {
+  //   readonly $refs: { [key: string]: VueUploadComponent };
+  // }
+// }
+
+export default VueUploadComponent