webpack/lib/wasm/WasmFinalizeExportsPlugin.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 UnsupportedWebAssemblyFeatureError = require("./UnsupportedWebAssemblyFeatureError");

class WasmFinalizeExportsPlugin {
	apply(compiler) {
		compiler.hooks.compilation.tap("WasmFinalizeExportsPlugin", compilation => {
			compilation.hooks.finishModules.tap(
				"WasmFinalizeExportsPlugin",
				modules => {
					for (const module of modules) {
						// 1. if a WebAssembly module
						if (module.type.startsWith("webassembly") === true) {
							const jsIncompatibleExports =
								module.buildMeta.jsIncompatibleExports;

							if (jsIncompatibleExports === undefined) {
								continue;
							}

							for (const reason of module.reasons) {
								// 2. is referenced by a non-WebAssembly module
								if (reason.module.type.startsWith("webassembly") === false) {
									const ref = compilation.getDependencyReference(
										reason.module,
										reason.dependency
									);

									if (!ref) continue;

									const importedNames = ref.importedNames;

									if (Array.isArray(importedNames)) {
										importedNames.forEach(name => {
											// 3. and uses a func with an incompatible JS signature
											if (
												Object.prototype.hasOwnProperty.call(
													jsIncompatibleExports,
													name
												)
											) {
												// 4. error
												/** @type {any} */
												const error = new UnsupportedWebAssemblyFeatureError(
													`Export "${name}" with ${jsIncompatibleExports[name]} can only be used for direct wasm to wasm dependencies`
												);
												error.module = module;
												error.origin = reason.module;
												error.originLoc = reason.dependency.loc;
												error.dependencies = [reason.dependency];
												compilation.errors.push(error);
											}
										});
									}
								}
							}
						}
					}
				}
			);
		});
	}
}

module.exports = WasmFinalizeExportsPlugin;