webpack/lib/WebAssemblyParser.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
/* globals WebAssembly */
"use strict";

// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API

const Tapable = require("tapable").Tapable;
const WebAssemblyImportDependency = require("./dependencies/WebAssemblyImportDependency");

class WebAssemblyParser extends Tapable {
	constructor(options) {
		super();
		this.hooks = {};
		this.options = options;
	}

	parse(source, state, callback) {
		// TODO parse WASM AST and walk it
		// TODO extract imports

		// flag it as ESM
		state.module.buildMeta.exportsType = "namespace";

		// extract exports
		// TODO find more efficient way doing it
		// TODO use Promises
		if(typeof WebAssembly !== "undefined") {
			WebAssembly.compile(source).then(module => {
				state.module.buildMeta.providedExports = WebAssembly.Module.exports(module).map(exp => exp.name);
				for(const imp of WebAssembly.Module.imports(module)) {
					const dep = new WebAssemblyImportDependency(imp.module, imp.name, imp.kind);
					state.module.addDependency(dep);
				}
			}).then(() => callback(null, state), err => callback(err));
		} else {
			throw new Error("Can't compile WebAssembly modules without WebAssembly support in current node.js version (Update to latest node.js version)");
		}
	}
}

module.exports = WebAssemblyParser;