Is there a way to use this via Deno?

[mfulton26]

Deno implements createImageBitmap, ImageData, and Blob… I'm not sure if that's enough though.

Here's what I've tried so far:

#!/usr/bin/env -S deno run --ext=ts

import "npm:barcode-detector@^2";

const bytes = await new Response(Deno.stdin.readable).bytes();
const image = new Blob([bytes], { type: "image/png" });
const barcodeDetector = new BarcodeDetector({ formats: ["qr_code"] });
for (const { rawValue } of await barcodeDetector.detect(image)) {
  console.log(rawValue);
}

% cat ~/path/to/image.png | ~/path/to/detect-qr-code
error: Uncaught (in promise) ReferenceError: Failed to execute 'detect' on 'BarcodeDetector': document is not defined
    at ar (~/Library/Caches/deno/npm/registry.npmjs.org/barcode-detector/2.2.11/dist/es/pure.js:1939:75)
    at To.detect (~/Library/Caches/deno/npm/registry.npmjs.org/barcode-detector/2.2.11/dist/es/pure.js:2046:13)
    at eventLoopTick (ext:core/01_core.js:175:7)
    at async ~/path/to/detect-qr-code:8:28

    info: document global is not available in Deno.
    hint: Use a library like happy-dom, deno_dom, linkedom or JSDom
          and setup the document global according to the library documentation.

[Sec-ant]

I'm afraid they're still not enough. As what are suggested in the error messages, DOM APIs are required.

However, you have a better choice if you want to detect barcodes in deno: try zxing-wasm, which provides the core barcode detection ability of this package, exposes a lot more options and can run in more runtimes.

[mfulton26]

Thank you. This works well:

#!/usr/bin/env -S deno run --ext=ts --allow-net=fastly.jsdelivr.net:443

import { readBarcodesFromImageFile as detect } from "npm:zxing-wasm@1/reader";

const bytes = await new Response(Deno.stdin.readable).bytes();
const imageFile = new Blob([bytes], { type: "image/png" });
for (const { text } of await detect(imageFile, { formats: ["QRCode"] })) {
  console.log(text);
}

[mfulton26]

Updated to not assume mime type but detect it as well:

#!/usr/bin/env -S deno run --ext=ts --allow-net=fastly.jsdelivr.net:443

import { fileTypeFromBuffer } from "npm:file-type@19";
import { readBarcodesFromImageFile as detect } from "npm:zxing-wasm@1/reader";

const bytes = await new Response(Deno.stdin.readable).bytes();
const fileType = await fileTypeFromBuffer(bytes);
if (fileType === undefined) {
  console.error("cannot determine image file type");
  Deno.exit(-1);
}
const imageFile = new Blob([bytes], { type: fileType.mime });
for (const { text } of await detect(imageFile, { formats: ["QRCode"] })) {
  console.log(text);
}