webpack/lib/wasm-sync/WebAssemblyUtils.js

Packs CommonJs/AMD modules for the browser. Allows to split your codebase into multiple bundles, which can be loaded on demand. Support loaders to preprocess files, i.e. json, jsx, es7, css, less, ... and your custom stuff.

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/

"use strict";

const Template = require("../Template");
const WebAssemblyImportDependency = require("../dependencies/WebAssemblyImportDependency");

/** @typedef {import("../Module")} Module */
/** @typedef {import("../ModuleGraph")} ModuleGraph */

/** @typedef {Object} UsedWasmDependency
 * @property {WebAssemblyImportDependency} dependency the dependency
 * @property {string} name the export name
 * @property {string} module the module name
 */

const MANGLED_MODULE = "a";

/**
 * @param {ModuleGraph} moduleGraph the module graph
 * @param {Module} module the module
 * @param {boolean} mangle mangle module and export names
 * @returns {UsedWasmDependency[]} used dependencies and (mangled) name
 */
const getUsedDependencies = (moduleGraph, module, mangle) => {
	/** @type {UsedWasmDependency[]} */
	const array = [];
	let importIndex = 0;
	for (const dep of module.dependencies) {
		if (dep instanceof WebAssemblyImportDependency) {
			if (
				dep.description.type === "GlobalType" ||
				moduleGraph.getModule(dep) === null
			) {
				continue;
			}

			const exportName = dep.name;
			// TODO add the following 3 lines when removing of ModuleExport is possible
			// const importedModule = moduleGraph.getModule(dep);
			// const usedName = importedModule && moduleGraph.getExportsInfo(importedModule).getUsedName(exportName, runtime);
			// if (usedName !== false) {
			if (mangle) {
				array.push({
					dependency: dep,
					name: Template.numberToIdentifier(importIndex++),
					module: MANGLED_MODULE
				});
			} else {
				array.push({
					dependency: dep,
					name: exportName,
					module: dep.request
				});
			}
		}
	}
	return array;
};

exports.getUsedDependencies = getUsedDependencies;
exports.MANGLED_MODULE = MANGLED_MODULE;