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node_modules/webpack/lib/wasm-async/AsyncWasmLoadingRuntimeModule.js

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+/*
+	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, ${length}) + "`;
+					}
+				},
+				runtime: chunk.runtime
+			}
+		);
+		return `${fn} = ${runtimeTemplate.basicFunction(
+			"exports, wasmModuleId, wasmModuleHash, importsObj",
+			[
+				`var req = ${this.generateLoadBinaryCode(wasmModuleSrcPath)};`,
+				this.supportsStreaming
+					? Template.asString([
+							"if (typeof WebAssembly.instantiateStreaming === 'function') {",
+							Template.indent([
+								"return WebAssembly.instantiateStreaming(req, importsObj)",
+								Template.indent([
+									`.then(${runtimeTemplate.returningFunction(
+										"Object.assign(exports, res.instance.exports)",
+										"res"
+									)});`
+								])
+							]),
+							"}"
+					  ])
+					: "// no support for streaming compilation",
+				"return req",
+				Template.indent([
+					`.then(${runtimeTemplate.returningFunction("x.arrayBuffer()", "x")})`,
+					`.then(${runtimeTemplate.returningFunction(
+						"WebAssembly.instantiate(bytes, importsObj)",
+						"bytes"
+					)})`,
+					`.then(${runtimeTemplate.returningFunction(
+						"Object.assign(exports, res.instance.exports)",
+						"res"
+					)});`
+				])
+			]
+		)};`;
+	}
+}
+
+module.exports = AsyncWasmLoadingRuntimeModule;