I believe the two changes necessary are:

1. Add this line to wrangler.toml:

webpack_config = "webpack.config.js"

2. Change this line in index.js:

-      let instance = new WebAssembly.Instance(wasmprogram, info)
+      let instance = new WebAssembly.Instance(wasm, info)

If after installing the template and running it, one tries to execute curl http://localhost:8787/600*400.jpg?width=100 as suggested, the response is an error page due to timeout in some service.

Since the Emscripten process changes something, or there is something else going on, the compiler.hooks.compilation.tap('emscripten-build', compilation => {
just restarts immediately after the build if unchecked.

I'm sporadically getting the following error:

Uncaught (in promise)
RuntimeError: memory access out of bounds
    at _malloc (<anonymous>:wasm-function[68]:0x1fbd6)
    at _init (<anonymous>:wasm-function[15]:0x3408)
    at Object.e._init [as init] (worker.js:1:7350)
    at worker.js:1:11030
Uncaught (in response)
Error: internal error

I haven't enabled logging on prod, but i believe the following Error 1101 Ray ID: ... Worker threw exception is likely caused by the above

Trying to get it to work, and despite looking into several fixes in the issues section, it seems this is more or less entirely unmaintained for at least a year now

In Wrangler release 1.14.0 the global wasm binding was changed to WASM_MODULE (see #1730). The template no longer works out of the box if used with this version or newer.

cargo-generate fails to generate a project using this template because liquid is trying to do variable replacement/substitution within the source:

src/workers » wrangler generate my-emscripten-resizer https://github.com/cloudflare/worker-emscripten-template
⬇️ Installing cargo-generate...
🌀  🐑  Generating a new webpack worker project with name 'my-emscripten-resizer'... 🌀
🔧   Creating project called `my-emscripten-resizer`...
Error: liquid:    --> 288:32
    |
288 |             sprintf(temp, "{%d,%d}", d ? data[i] : (trims[i]>>8), trims[i]&255);␊
    |                                ^---
    |
    = expected Value, Range, ">", "<", "=", ",", ":", "==", "!=", "<>", ">=", or "<="

Error: failed to execute `"/Users/kristian/Library/Caches/.wrangler/cargo-generate-c45c3b5989732284/cargo-generate" "generate" "--git" "https://github.com/cloudflare/worker-emscripten-template" "--name" "my-emscripten-resizer" "--force"`: exited with exit code: 1

This is due to requiring the emscripten glue code in the worker, when the emscripten glue code is also built as part of the webpack build.

installed via npm i @cloudflare/wrangler -g
running node 10.1.0

Running as admin on windows 10 but getting this

λ wrangler generate myapp https://github.com/ashleygwilliams/worker-emscripten-template
⬇️ Installing cargo-generate...
  Generating a new webpack worker project with name 'myapp'...
 Creating project called `myapp`...
Error: liquid: Cannot read file
  with:
    path=C:\Repos\tests\myapp\src\stb\data\atari_8bit_font_revised.png

Error: failed to execute `"cmd" "/C" "C:\\Users\\miked\\AppData\\Local\\.wrangler\\cargo-generate-365221054903e5ed\\cargo-generate.exe" "generate" "--git" "https://github.com/ashleygwilliams/worker-emscripten-template" "--name" "myapp" "--force"`: exited with exit code: 1

trzeci/emscripten will be deprecated in favor of an official Emscripten Docker image.

https://hub.docker.com/r/trzeci/emscripten/
https://hub.docker.com/r/emscripten/emsdk

Hi,

After using the command line: wrangler generate resize https://github.com/ashleygwilliams/worker-emscripten-template

Error: liquid: --> 288:32
|
288 | sprintf(temp, "{%d,%d}", d ? data[i] : (trims[i]>>8), trims[i]&255);␊
| ^---
|
= expected Value, Range, ">", "<", "=", ",", ":", "==", "!=", "<>", ">=", or "<="

Error: ErrorMessage { msg: "failed to execute \"/Users/szelee/.cargo/bin/cargo-generate\" \"generate\" \"--git\" \"https://github.com/ashleygwilliams/worker-emscripten-template\" \"--name\" \"resize\" \"--force\": exited with exit code: 1" }