WASM runtime error

edge functions🟡javascript

Hi,
I've compiled my WASM package using

wasm-pack

wasm-pack

and it won't run on the server. I've created a small example package with the deno runtime and it works just fine. Seems to be an issue with the edge function deploy. FWIW, it also seems to be duplicating my

{packageName}/index.js

{packageName}/index.js

file when I deploy with docker running. I've followed the guide, and I've burned a full day trying to diagnose and triage these issues. Here's the error:

{
  "event_message": "event loop error: TypeError: NetworkError when attempting to fetch resource\n    at opFetchSend (ext:deno_fetch/26_fetch.js:92:10)\n    at mainFetch (ext:deno_fetch/26_fetch.js:191:18)\n    at ext:deno_fetch/26_fetch.js:419:11\n    at new Promise (<anonymous>)\n    at fetch (ext:deno_fetch/26_fetch.js:369:20)\n    at file:///var/tmp/sb-compile-edge-runtime/functions/<function name>/<wasm-module-name>/index.js:304:65",
  "id": "1677ba43-4a3a-4082-90dd-7fabde759f92",
  "metadata": [
    {
      "boot_time": null,
      "cpu_time_used": null,
      "deployment_id": "<removed>",
      "event_type": "UncaughtException",
      "execution_id": "eb45e80a-da7f-484a-b8d4-ccec40fd9a94",
      "function_id": "<removed>",
      "level": "error",
      "memory_used": [],
      "project_ref": "<removed>",
      "reason": null,
      "region": "us-east-1",
      "served_by": "supabase-edge-runtime-1.69.25 (compatible with Deno v2.1.4)",
      "timestamp": "2026-01-15T21:56:24.477Z",
      "version": "29"
    }
  ],
  "timestamp": 1768514184477000
}

{
  "event_message": "event loop error: TypeError: NetworkError when attempting to fetch resource\n    at opFetchSend (ext:deno_fetch/26_fetch.js:92:10)\n    at mainFetch (ext:deno_fetch/26_fetch.js:191:18)\n    at ext:deno_fetch/26_fetch.js:419:11\n    at new Promise (<anonymous>)\n    at fetch (ext:deno_fetch/26_fetch.js:369:20)\n    at file:///var/tmp/sb-compile-edge-runtime/functions/<function name>/<wasm-module-name>/index.js:304:65",
  "id": "1677ba43-4a3a-4082-90dd-7fabde759f92",
  "metadata": [
    {
      "boot_time": null,
      "cpu_time_used": null,
      "deployment_id": "<removed>",
      "event_type": "UncaughtException",
      "execution_id": "eb45e80a-da7f-484a-b8d4-ccec40fd9a94",
      "function_id": "<removed>",
      "level": "error",
      "memory_used": [],
      "project_ref": "<removed>",
      "reason": null,
      "region": "us-east-1",
      "served_by": "supabase-edge-runtime-1.69.25 (compatible with Deno v2.1.4)",
      "timestamp": "2026-01-15T21:56:24.477Z",
      "version": "29"
    }
  ],
  "timestamp": 1768514184477000
}

Which suggests that the issue is coming from these lines:

const wasmUrl = new URL('index_bg.wasm', import.meta.url);
const wasmInstantiated = await WebAssembly.instantiateStreaming(fetch(wasmUrl), __wbg_get_imports());
const wasm = wasmInstantiated.instance.exports;
wasm.__wbindgen_start();

const wasmUrl = new URL('index_bg.wasm', import.meta.url);
const wasmInstantiated = await WebAssembly.instantiateStreaming(fetch(wasmUrl), __wbg_get_imports());
const wasm = wasmInstantiated.instance.exports;
wasm.__wbindgen_start();

L304

L304

is the

wasmInstantiated

wasmInstantiated

line.

I'm using

wasm-pack 0.13.1

wasm-pack 0.13.1

.

Please let me know if there are any other details you need.

WASM runtime error

edge functions🟡javascript

Hi,
I've compiled my WASM package using

wasm-pack

wasm-pack

{packageName}/index.js

{packageName}/index.js

file when I deploy with docker running. I've followed the guide, and I've burned a full day trying to diagnose and triage these issues. Here's the error:

{
  "event_message": "event loop error: TypeError: NetworkError when attempting to fetch resource\n    at opFetchSend (ext:deno_fetch/26_fetch.js:92:10)\n    at mainFetch (ext:deno_fetch/26_fetch.js:191:18)\n    at ext:deno_fetch/26_fetch.js:419:11\n    at new Promise (<anonymous>)\n    at fetch (ext:deno_fetch/26_fetch.js:369:20)\n    at file:///var/tmp/sb-compile-edge-runtime/functions/<function name>/<wasm-module-name>/index.js:304:65",
  "id": "1677ba43-4a3a-4082-90dd-7fabde759f92",
  "metadata": [
    {
      "boot_time": null,
      "cpu_time_used": null,
      "deployment_id": "<removed>",
      "event_type": "UncaughtException",
      "execution_id": "eb45e80a-da7f-484a-b8d4-ccec40fd9a94",
      "function_id": "<removed>",
      "level": "error",
      "memory_used": [],
      "project_ref": "<removed>",
      "reason": null,
      "region": "us-east-1",
      "served_by": "supabase-edge-runtime-1.69.25 (compatible with Deno v2.1.4)",
      "timestamp": "2026-01-15T21:56:24.477Z",
      "version": "29"
    }
  ],
  "timestamp": 1768514184477000
}

{
  "event_message": "event loop error: TypeError: NetworkError when attempting to fetch resource\n    at opFetchSend (ext:deno_fetch/26_fetch.js:92:10)\n    at mainFetch (ext:deno_fetch/26_fetch.js:191:18)\n    at ext:deno_fetch/26_fetch.js:419:11\n    at new Promise (<anonymous>)\n    at fetch (ext:deno_fetch/26_fetch.js:369:20)\n    at file:///var/tmp/sb-compile-edge-runtime/functions/<function name>/<wasm-module-name>/index.js:304:65",
  "id": "1677ba43-4a3a-4082-90dd-7fabde759f92",
  "metadata": [
    {
      "boot_time": null,
      "cpu_time_used": null,
      "deployment_id": "<removed>",
      "event_type": "UncaughtException",
      "execution_id": "eb45e80a-da7f-484a-b8d4-ccec40fd9a94",
      "function_id": "<removed>",
      "level": "error",
      "memory_used": [],
      "project_ref": "<removed>",
      "reason": null,
      "region": "us-east-1",
      "served_by": "supabase-edge-runtime-1.69.25 (compatible with Deno v2.1.4)",
      "timestamp": "2026-01-15T21:56:24.477Z",
      "version": "29"
    }
  ],
  "timestamp": 1768514184477000
}

Which suggests that the issue is coming from these lines:

const wasmUrl = new URL('index_bg.wasm', import.meta.url);
const wasmInstantiated = await WebAssembly.instantiateStreaming(fetch(wasmUrl), __wbg_get_imports());
const wasm = wasmInstantiated.instance.exports;
wasm.__wbindgen_start();

const wasmUrl = new URL('index_bg.wasm', import.meta.url);
const wasmInstantiated = await WebAssembly.instantiateStreaming(fetch(wasmUrl), __wbg_get_imports());
const wasm = wasmInstantiated.instance.exports;
wasm.__wbindgen_start();

L304

L304

is the

wasmInstantiated

wasmInstantiated

line.

I'm using

wasm-pack 0.13.1

wasm-pack 0.13.1

.

Please let me know if there are any other details you need.

WASM runtime error

WASM runtime error

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