青岛推送

WXL

3 天以前 9bce51f651aad297ef9eb6df832bfdaf1de05d84

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/*
    MIT License http://www.opensource.org/licenses/mit-license.php
    Author Tobias Koppers @sokra
*/
 
"use strict";
 
const { WEBASSEMBLY_MODULE_TYPE_ASYNC } = require("../ModuleTypeConstants");
const RuntimeGlobals = require("../RuntimeGlobals");
const AsyncWasmCompileRuntimeModule = require("../wasm-async/AsyncWasmCompileRuntimeModule");
const AsyncWasmLoadingRuntimeModule = require("../wasm-async/AsyncWasmLoadingRuntimeModule");
 
/** @typedef {import("../Chunk")} Chunk */
/** @typedef {import("../Compiler")} Compiler */
 
const PLUGIN_NAME = "FetchCompileAsyncWasmPlugin";
 
/**
 * Enables asynchronous WebAssembly loading through `fetch` for environments
 * that can instantiate fetched binaries at runtime.
 */
class FetchCompileAsyncWasmPlugin {
    /**
     * Registers compilation hooks that attach the async fetch-based wasm runtime
     * to chunks containing async WebAssembly modules.
     * @param {Compiler} compiler the compiler instance
     * @returns {void}
     */
    apply(compiler) {
        compiler.hooks.thisCompilation.tap(PLUGIN_NAME, (compilation) => {
            const globalWasmLoading = compilation.outputOptions.wasmLoading;
            /**
             * Determines whether the chunk should load async WebAssembly binaries
             * through the `fetch` backend.
             * @param {Chunk} chunk chunk
             * @returns {boolean} true, if wasm loading is enabled for the chunk
             */
            const isEnabledForChunk = (chunk) => {
                const options = chunk.getEntryOptions();
                const wasmLoading =
                    options && options.wasmLoading !== undefined
                        ? options.wasmLoading
                        : globalWasmLoading;
                return wasmLoading === "fetch";
            };
            /**
             * Generates the runtime expression that downloads the emitted wasm
             * binary for an async WebAssembly module.
             * @param {string} path path to the wasm file
             * @returns {string} code to load the wasm file
             */
            const generateLoadBinaryCode = (path) =>
                `fetch(${RuntimeGlobals.publicPath} + ${path})`;
 
            compilation.hooks.runtimeRequirementInTree
                .for(RuntimeGlobals.instantiateWasm)
                .tap(PLUGIN_NAME, (chunk, set, { chunkGraph }) => {
                    if (!isEnabledForChunk(chunk)) return;
                    if (
                        !chunkGraph.hasModuleInGraph(
                            chunk,
                            (m) => m.type === WEBASSEMBLY_MODULE_TYPE_ASYNC
                        )
                    ) {
                        return;
                    }
                    set.add(RuntimeGlobals.publicPath);
                    compilation.addRuntimeModule(
                        chunk,
                        new AsyncWasmLoadingRuntimeModule({
                            generateLoadBinaryCode,
                            supportsStreaming: true
                        })
                    );
                });
 
            compilation.hooks.runtimeRequirementInTree
                .for(RuntimeGlobals.compileWasm)
                .tap(PLUGIN_NAME, (chunk, set, { chunkGraph }) => {
                    if (!isEnabledForChunk(chunk)) return;
                    if (
                        !chunkGraph.hasModuleInGraph(
                            chunk,
                            (m) => m.type === WEBASSEMBLY_MODULE_TYPE_ASYNC
                        )
                    ) {
                        return;
                    }
                    set.add(RuntimeGlobals.publicPath);
                    compilation.addRuntimeModule(
                        chunk,
                        new AsyncWasmCompileRuntimeModule({
                            generateLoadBinaryCode,
                            supportsStreaming: true
                        })
                    );
                });
        });
    }
}
 
module.exports = FetchCompileAsyncWasmPlugin;