emcc output does not work in Node.js 18.

[mizar]

Preparatory operations

docker pull emscripten/emsdk:latest;
docker pull node:lts-alpine;
docker pull node:alpine;

Version of emscripten/emsdk:

input command:

docker run --rm emscripten/emsdk:latest emcc -v;

output:

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.10 (c3fe57af0504fe24fc4ba697feb8c204f3c80022)
clang version 15.0.0 (https://github.com/llvm/llvm-project 8bc29d14273b05b05d5a56e34c07948dc2c770d3)
Target: wasm32-unknown-emscripten
Thread model: posix
InstalledDir: /emsdk/upstream/bin

Failing command line in full:

Suppose the following files are placed in the current directory:

./hello.c:

#include <stdio.h>
int main(int argc, char** argv){
  printf("Hello, world!\n");
  return 0;
}

compile

input command:

docker run --rm -v ${PWD}:/src emscripten/emsdk:latest emcc hello.c -o hello.js;

run on node:lts-alpine (success)

input command:

docker run --rm -v ${PWD}:/src node:lts-alpine node /src/hello.js;

output:

Hello, world!

run on node:alpine (failed)

input command:

docker run --rm -v ${PWD}:/src node:alpine node /src/hello.js;

output:

(node:1) ExperimentalWarning: The Fetch API is an experimental feature. This feature could change at any time
(Use `node --trace-warnings ...` to show where the warning was created)
/src/hello.js:146
      throw ex;
      ^

TypeError: Failed to parse URL from /src/hello.wasm
    at new Request (node:internal/deps/undici/undici:4816:19)
    at Agent2.fetch2 (node:internal/deps/undici/undici:5544:29)
    ... 4 lines matching cause stack trace ...
    at Object.<anonymous> (/src/hello.js:1914:11)
    at Module._compile (node:internal/modules/cjs/loader:1105:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1159:10)
    at Module.load (node:internal/modules/cjs/loader:981:32) {
  [cause]: TypeError [ERR_INVALID_URL]: Invalid URL
      at new NodeError (node:internal/errors:377:5)
      at URL.onParseError (node:internal/url:563:9)
      at new URL (node:internal/url:643:5)
      at new Request (node:internal/deps/undici/undici:4814:25)
      at Agent2.fetch2 (node:internal/deps/undici/undici:5544:29)
      at Object.fetch (node:internal/deps/undici/undici:6372:20)
      at fetch (node:internal/bootstrap/pre_execution:199:25)
      at instantiateAsync (/src/hello.js:1670:14)
      at createWasm (/src/hello.js:1707:3)
      at Object.<anonymous> (/src/hello.js:1914:11) {
    input: '/src/hello.wasm',
    code: 'ERR_INVALID_URL'
  }
}

Node.js v18.1.0

run on node:alpine with --no-experimental-fetch (success)

input command:

docker run --rm -v ${PWD}:/src node:alpine node --no-experimental-fetch /src/hello.js;

output:

Hello, world!

[mizar]

Related:

• Node.js implemented WebAssembly.instantiateStreaming in v18.1.0 #16913
• Fixes #16913: Don't use fetch() in Node.js environment #16917

[mizar]

• Fails with Node.js v18.1.0 antelle/argon2-browser#81

input command:

docker run --rm -v ${PWD}:/src node:alpine sh -c "NODE_OPTIONS='--no-experimental-fetch' node /src/hello.js";

output:

Hello, world!

[mizar]

Related:

• lib,src: implement WebAssembly Web API nodejs/node#42701

[svenpilz]

Same here, --no-experimental-fetch helps. Thanks @mizar.

[kripken]

This should be fixed by #16917