1 files changed, 118 insertions, 0 deletions
diff --git a/node_modules/webpack/lib/wasm-async/AsyncWasmLoadingRuntimeModule.js b/node_modules/webpack/lib/wasm-async/AsyncWasmLoadingRuntimeModule.js
new file mode 100644
index 00000000..bf294381
--- /dev/null
+++ b/node_modules/webpack/lib/wasm-async/AsyncWasmLoadingRuntimeModule.js
@@ -0,0 +1,118 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+const RuntimeGlobals = require("../RuntimeGlobals");
+const RuntimeModule = require("../RuntimeModule");
+const Template = require("../Template");
+
+/** @typedef {import("../Chunk")} Chunk */
+/** @typedef {import("../Compilation")} Compilation */
+
+/**
+ * @typedef {object} AsyncWasmLoadingRuntimeModuleOptions
+ * @property {function(string): string} generateLoadBinaryCode
+ * @property {boolean} supportsStreaming
+ */
+
+class AsyncWasmLoadingRuntimeModule extends RuntimeModule {
+	/**
+	 * @param {AsyncWasmLoadingRuntimeModuleOptions} options options
+	 */
+	constructor({ generateLoadBinaryCode, supportsStreaming }) {
+		super("wasm loading", RuntimeModule.STAGE_NORMAL);
+		this.generateLoadBinaryCode = generateLoadBinaryCode;
+		this.supportsStreaming = supportsStreaming;
+	}
+
+	/**
+	 * @returns {string | null} runtime code
+	 */
+	generate() {
+		const compilation = /** @type {Compilation} */ (this.compilation);
+		const chunk = /** @type {Chunk} */ (this.chunk);
+		const { outputOptions, runtimeTemplate } = compilation;
+		const fn = RuntimeGlobals.instantiateWasm;
+		const wasmModuleSrcPath = compilation.getPath(
+			JSON.stringify(outputOptions.webassemblyModuleFilename),
+			{
+				hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
+				hashWithLength: length =>
+					`" + ${RuntimeGlobals.getFullHash}}().slice(0, ${length}) + "`,
+				module: {
+					id: '" + wasmModuleId + "',
+					hash: `" + wasmModuleHash + "`,
+					hashWithLength(length) {
+						return `" + wasmModuleHash.slice(0, ${length}) + "`;
+					}
+				},
+				runtime: chunk.runtime
+			}
+		);
+
+		const loader = this.generateLoadBinaryCode(wasmModuleSrcPath);
+		const fallback = [
+			`.then(${runtimeTemplate.returningFunction("x.arrayBuffer()", "x")})`,
+			`.then(${runtimeTemplate.returningFunction(
+				"WebAssembly.instantiate(bytes, importsObj)",
+				"bytes"
+			)})`,
+			`.then(${runtimeTemplate.returningFunction(
+				"Object.assign(exports, res.instance.exports)",
+				"res"
+			)})`
+		];
+		const getStreaming = () => {
+			const concat = (/** @type {string[]} */ ...text) => text.join("");
+			return [
+				`var req = ${loader};`,
+				`var fallback = ${runtimeTemplate.returningFunction(
+					Template.asString(["req", Template.indent(fallback)])
+				)};`,
+				concat(
+					"return req.then(",
+					runtimeTemplate.basicFunction("res", [
+						`if (typeof WebAssembly.instantiateStreaming === "function") {`,
+						Template.indent([
+							"return WebAssembly.instantiateStreaming(res, importsObj)",
+							Template.indent([
+								".then(",
+								Template.indent([
+									`${runtimeTemplate.returningFunction(
+										"Object.assign(exports, res.instance.exports)",
+										"res"
+									)},`,
+									runtimeTemplate.basicFunction("e", [
+										`if(res.headers.get("Content-Type") !== "application/wasm") {`,
+										Template.indent([
+											'console.warn("`WebAssembly.instantiateStreaming` failed because your server does not serve wasm with `application/wasm` MIME type. Falling back to `WebAssembly.instantiate` which is slower. Original error:\\n", e);',
+											"return fallback();"
+										]),
+										"}",
+										"throw e;"
+									])
+								]),
+								");"
+							])
+						]),
+						"}",
+						"return fallback();"
+					]),
+					");"
+				)
+			];
+		};
+
+		return `${fn} = ${runtimeTemplate.basicFunction(
+			"exports, wasmModuleId, wasmModuleHash, importsObj",
+			this.supportsStreaming
+				? getStreaming()
+				: [`return ${loader}`, `${Template.indent(fallback)};`]
+		)};`;
+	}
+}
+
+module.exports = AsyncWasmLoadingRuntimeModule;