Facing an issue with this error in vue.js "upload is not defined"

Question

Here i am using this vue.js code for multiupload images. So Here I am facing an error. So please tell me where I am going wrong. And the error is

upload is not defined.

So please help me to figure out this. While I am uploading the images the images are not displaying and i am facing this error like "upload is not define". So please help me to sort out this I am trying alot but oty able to fix the issue

<html>
<head>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>

<body>
<div id="app">
    <div class="container">
      <!--UPLOAD-->
      <form enctype="multipart/form-data" novalidate v-if="isInitial || isSaving">
        <h1>Upload images</h1>
        <div class="dropbox">
          <input type="file" multiple :name="uploadFieldName" :disabled="isSaving" @change="filesChange($event.target.name, $event.target.files); fileCount = $event.target.files.length"
            accept="image/*" class="input-file">
            <p v-if="isInitial">
              Drag your file(s) here to begin<br> or click to browse
            </p>
            <p v-if="isSaving">
              Uploading {{ fileCount }} files...
            </p>
        </div>
      </form>
  </div>
  
 
 <script type="module">
    import { upload } from "./file-upload.fake.service"; 
    import { wait } from "./utils";
</script>
 
  <script>
  const STATUS_INITIAL = 0, STATUS_SAVING = 1, STATUS_SUCCESS = 2, STATUS_FAILED = 3;
  
  new Vue({
    el: '#app',
    data() {
      return {
        fileCount:'',
        uploadedFiles: [],
        uploadError: null,
        currentStatus: null,
        uploadFieldName: 'photos'
      }
    },
    computed: {
      isInitial() {
        return this.currentStatus === STATUS_INITIAL;
      },
      isSaving() {
        return this.currentStatus === STATUS_SAVING;
      },
      isSuccess() {
        return this.currentStatus === STATUS_SUCCESS;
      },
      isFailed() {
        return this.currentStatus === STATUS_FAILED;
      }
    },
    methods: {
      reset() {
        // reset form to initial state
        this.currentStatus = STATUS_INITIAL;
        this.uploadedFiles = [];
        this.uploadError = null;
      },
      save(formData) {
        // upload data to the server
        this.currentStatus = STATUS_SAVING;
        upload(formData)
          .then(wait(1500)) // DEV ONLY: wait for 1.5s 
          .then(x => {
            this.uploadedFiles = [].concat(x);
            this.currentStatus = STATUS_SUCCESS;
          })
          .catch(err => {
            this.uploadError = err.response;
            this.currentStatus = STATUS_FAILED;
          });
      },
      filesChange(fieldName, fileList) {
        // handle file changes
        const formData = new FormData();
        if (!fileList.length) return;
        // append the files to FormData
        Array
          .from(Array(fileList.length).keys())
          .map(x => {
            formData.append(fieldName, fileList[x], fileList[x].name);
          });
        // save it
        this.save(formData);
      }
    },
    mounted() {
      this.reset();
    },
  })
  </script>
</body>
</html>