/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Alexander Akait @alexander-akait
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*/
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"use strict";
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const { WEBASSEMBLY_MODULE_TYPE_ASYNC } = require("../ModuleTypeConstants");
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const RuntimeGlobals = require("../RuntimeGlobals");
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const Template = require("../Template");
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const AsyncWasmLoadingRuntimeModule = require("../wasm-async/AsyncWasmLoadingRuntimeModule");
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compiler")} Compiler */
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const PLUGIN_NAME = "UniversalCompileAsyncWasmPlugin";
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class UniversalCompileAsyncWasmPlugin {
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/**
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* Apply the plugin
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* @param {Compiler} compiler the compiler instance
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* @returns {void}
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*/
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apply(compiler) {
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compiler.hooks.thisCompilation.tap(PLUGIN_NAME, compilation => {
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const globalWasmLoading = compilation.outputOptions.wasmLoading;
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/**
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* @param {Chunk} chunk chunk
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* @returns {boolean} true, if wasm loading is enabled for the chunk
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*/
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const isEnabledForChunk = chunk => {
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const options = chunk.getEntryOptions();
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const wasmLoading =
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options && options.wasmLoading !== undefined
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? options.wasmLoading
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: globalWasmLoading;
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return wasmLoading === "universal";
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};
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const generateBeforeInstantiateStreaming = () =>
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Template.asString([
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"if (!useFetch) {",
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Template.indent(["return fallback();"]),
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"}"
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]);
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/**
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* @param {string} path path
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* @returns {string} code
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*/
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const generateBeforeLoadBinaryCode = path =>
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Template.asString([
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"var useFetch = typeof document !== 'undefined' || typeof self !== 'undefined';",
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`var wasmUrl = ${path};`
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]);
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/**
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* @type {(path: string) => string}
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*/
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const generateLoadBinaryCode = () =>
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Template.asString([
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"(useFetch",
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Template.indent([
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`? fetch(new URL(wasmUrl, ${compilation.outputOptions.importMetaName}.url))`
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]),
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Template.indent([
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": Promise.all([import('fs'), import('url')]).then(([{ readFile }, { URL }]) => new Promise((resolve, reject) => {",
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Template.indent([
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`readFile(new URL(wasmUrl, ${compilation.outputOptions.importMetaName}.url), (err, buffer) => {`,
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Template.indent([
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"if (err) return reject(err);",
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"",
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"// Fake fetch response",
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"resolve({",
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Template.indent(["arrayBuffer() { return buffer; }"]),
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"});"
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]),
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"});"
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]),
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"})))"
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])
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]);
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compilation.hooks.runtimeRequirementInTree
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.for(RuntimeGlobals.instantiateWasm)
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.tap(PLUGIN_NAME, (chunk, set, { chunkGraph }) => {
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if (!isEnabledForChunk(chunk)) return;
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if (
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!chunkGraph.hasModuleInGraph(
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chunk,
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m => m.type === WEBASSEMBLY_MODULE_TYPE_ASYNC
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)
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) {
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return;
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}
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compilation.addRuntimeModule(
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chunk,
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new AsyncWasmLoadingRuntimeModule({
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generateBeforeLoadBinaryCode,
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generateLoadBinaryCode,
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generateBeforeInstantiateStreaming,
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supportsStreaming: true
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})
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);
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});
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});
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}
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}
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module.exports = UniversalCompileAsyncWasmPlugin;
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