Will there be support for deno deploy + esm.sh

[deepak-coding-art]

I tried to load the npm package with esm.sh but it gives an error:

 Import 'https://esm.sh/v111/@dqbd/tiktoken@1.0.2/deno/tiktoken_bg.wasm.js' failed: 522 <unknown status code>
    at https://esm.sh/v111/@dqbd/tiktoken@1.0.2/deno/tiktoken.js:2:419

here is the import statement

import {
  encoding_for_model,
  get_encoding,
} from "https://esm.sh/@dqbd/tiktoken@1.0.2";

I want to use it in supabase edge functions they use deno deploy and it does not support npm packages

Another error:

error: invalid utf-8 sequence of 1 bytes from index 9
    at https://esm.sh/v111/@dqbd/tiktoken@1.0.2/deno/tiktoken.js:2:419

[dqbd]

Hello, currently Deno / Supabase Edge Functions are not supported, but you might get far enough with NPM compat layer.

Tested on Deno 1.29.1

import tiktoken from "npm:@dqbd/tiktoken";

console.log(tiktoken.get_encoding("gpt2").encode("Hello World!"));

[dqbd]

However, Deno Deploy will most likely not work yet, as NPM specifiers are not supported yet.

Yes, Deno Deploy is an excellent choice to host your Deno code, especially if you want it to be executed close to your users on the edge. Deploying to our V8 isolate cloud takes seconds and can be accessed around the world within seconds. Also, npm specifiers aren't currently supported in Deploy, but will be soon.

https://deno.com/blog/npm-and-deno-anywhere

[dqbd]

Digging a little bit deeper, you can use @dqbd/tiktoken/lite via esm.sh with the following code:

import { init, Tiktoken } from "https://esm.sh/@dqbd/tiktoken/lite/init";
import cl100k_base from "https://esm.sh/@dqbd/tiktoken/encoders/cl100k_base.json" assert { type: "json" };

await init(async (imports) => {
  const req = await fetch(
    "https://esm.sh/@dqbd/tiktoken/lite/tiktoken_bg.wasm"
  );
  return WebAssembly.instantiate(await req.arrayBuffer(), imports);
});

const enc = new Tiktoken(
  cl100k_base.bpe_ranks,
  cl100k_base.special_tokens,
  cl100k_base.pat_str
);
const tokens = enc.encode("Hello world");
enc.free();

It seems like there is a caching bug in esm.sh, which serves the lite WASM file even if full version is requested, see esm-dev/esm.sh#552

[arthur5005]

Digging a little bit deeper, you can use @dqbd/tiktoken/lite via esm.sh with the following code:

import { init, Tiktoken } from "https://esm.sh/@dqbd/tiktoken/lite/init";
import cl100k_base from "https://esm.sh/@dqbd/tiktoken/encoders/cl100k_base.json" assert { type: "json" };

await init(async (imports) => {
  const req = await fetch(
    "https://esm.sh/@dqbd/tiktoken/lite/tiktoken_bg.wasm"
  );
  return WebAssembly.instantiate(await req.arrayBuffer(), imports);
});

const enc = new Tiktoken(
  cl100k_base.bpe_ranks,
  cl100k_base.special_tokens,
  cl100k_base.pat_str
);
const tokens = enc.encode("Hello world");
enc.free();

It seems like there is a caching bug in esm.sh, which serves the lite WASM file even if full version is requested, see esm-dev/esm.sh#552

I gave this a go David @dqbd, this is failing for me randomly.

About 50% it initializes with success, and the other 50% it fails. My uneducated guess is that this is because they are running in limited resource serverless functions on Supabase, but I have no idea really.

Error: `unwrap_throw` failed
    at Y (https://esm.sh/v119/@dqbd/tiktoken@1.0.7/deno/lite/init.js:2:5691)
    at <anonymous> (wasm://wasm/00307922:1:458526)
    at <anonymous> (wasm://wasm/00307922:1:427757)
    at <anonymous> (wasm://wasm/00307922:1:14850)
    at new y (https://esm.sh/v119/@dqbd/tiktoken@1.0.7/deno/lite/init.js:2:2567)
    at getEncoder (file:///src/index.ts:16:15)
    at async file:///src/index.ts:48:21
    at async Server.<anonymous> (file:///_shared/serveClient.ts:40:20)
    at async Server.#respond (https://deno.land/std@0.168.0/http/server.ts:301:18)
    ```

[arthur5005]

@dqbd ... actually having specified a version in this fetch url, seems to have stabilized it...

export async function getEncoder() {
  await init(async (imports) => {
    const req = await fetch(
      "https://esm.sh/@dqbd/tiktoken@1.0.7/lite/tiktoken_bg.wasm"

[gregnr]

@arthur5005 sounds like you've solved this. FWIW, we also use the fetch() approach at Supabase to load JSON within edge functions (Deno):
https://github.com/supabase/supabase/blob/d730ea9ca066b3a2ebe232195149725257c3eb25/supabase/functions/common/tokenizer.ts#L4

Worth noting JSON imports should be fixed now as of last week, so fetch() may no longer be required if you're on the latest edge-runtime:
supabase/edge-runtime#74