ionic 'DocumentScanner' 指的是一个值，但在这里被用作一个类型

Question

I have the following code:

import {Component} from '@angular/core';
import {DocumentScanner, DocumentScannerOptions, DocumentScannerSourceType} from '@ionic-native/document-scanner';

@Component({
    selector: 'app-tab2',
    templateUrl: 'tab2.page.html',
    styleUrls: ['tab2.page.scss']
})
export class Tab2Page {

    constructor(private documentScanner: DocumentScanner) {
    }

    scan() {
        const opts: DocumentScannerOptions = {
            sourceType: DocumentScannerSourceType.CAMERA,
            fileName: 'ticketScan.png',
            quality: 100,
            returnBase64: true
        };
        this.documentScanner.scanDoc(opts)
            .then((res: string) => console.log(res))
            .catch((error: any) => console.error(error));
    }
}

When i run this i get the following error:

11:42 'DocumentScanner' refers to a value, but is being used as a type here.

can anyone tell me why this is happening?

Answer 1

You need to import DocumentScanner in your app.module.ts file

import { DocumentScanner } from '@ionic-native/document-scanner/ngx';

and also add it to the provider array

providers: [
.....
   DocumentScanner ,
.....
]

Also in your page.ts file, add /ngx/; after the document scanner import path like

import { DocumentScanner } from '@ionic-native/document-scanner/ngx/';

Hope it helps.

Answer 2

As mentioned here , if any file in your project has a missing /ngx import, it may cause issues even in files where /ngx is present.

So you should check every file for missing /ngx imports.