🙋 WASM support for Node targets

[davidnagli]

🙋 Feature Request

Currently if you run Parcel on a project that uses WASM (I tried it on Rust), the output uses fetch() to get the .wasm file. We should detect if target is 'node', and use fs instead of fetch.

As far as I understood WASM is already supported in Node 8 and Node 9.

Running the way it is, I get the following error:

$ node dist/index.js
/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:8
module.exports=function(t){return fetch(t).then(function(t){return WebAssembly.instantiateStreaming?WebAssembly.instantiateStreaming(t):t.arrayBuffer().then(function(t){return WebAssembly.instantiate(t)})}).then(function(t){return t.instance.exports})};
                           ^

ReferenceError: fetch is not defined
    at module.exports (/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:8:28)
    at u (/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:6:610)
    at Array.map (<anonymous>)
    at Function.t [as load] (/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:6:303)
    at Object.require.0 (/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:10:50)
    at t (/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:1:408)
    at /Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:1:646
    at Object.<anonymous> (/Users/davidnagli/Desktop/coding/playground/parcel-rust-test/dist/index.js:1:663)
    at Module._compile (module.js:649:30)
    at Object.Module._extensions..js (module.js:660:10)

Repo to Reproduce

Here's where that fetch() comes from:

parcel/src/builtins/loaders/wasm-loader.js

Lines 1 to 16 in fc041d0

	module.exports = function loadWASMBundle(bundle) {
	return fetch(bundle)
	.then(function (res) {
	if (WebAssembly.instantiateStreaming) {
	return WebAssembly.instantiateStreaming(res);
	} else {
	return res.arrayBuffer()
	.then(function (data) {
	return WebAssembly.instantiate(data);
	});
	}
	})
	.then(function (wasmModule) {
	return wasmModule.instance.exports;
	});
	};

[fathyb]

Maybe duplicate of #969, #981 fixes it

[davidnagli]

Oh cool 👍 😃