/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const RuntimeGlobals = require("../RuntimeGlobals");
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const RuntimeModule = require("../RuntimeModule");
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const Template = require("../Template");
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/** @typedef {import("../Chunk")} Chunk */
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/** @typedef {import("../Compilation")} Compilation */
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/** @typedef {(wasmModuleSrcPath: string) => string} GenerateBeforeLoadBinaryCode */
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/** @typedef {(wasmModuleSrcPath: string) => string} GenerateLoadBinaryCode */
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/** @typedef {() => string} GenerateBeforeCompileStreaming */
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/**
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* @typedef {object} AsyncWasmCompileRuntimeModuleOptions
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* @property {GenerateLoadBinaryCode} generateLoadBinaryCode
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* @property {GenerateBeforeLoadBinaryCode=} generateBeforeLoadBinaryCode
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* @property {GenerateBeforeCompileStreaming=} generateBeforeCompileStreaming
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* @property {boolean} supportsStreaming
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*/
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class AsyncWasmCompileRuntimeModule extends RuntimeModule {
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/**
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* @param {AsyncWasmCompileRuntimeModuleOptions} options options
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*/
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constructor({
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generateLoadBinaryCode,
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generateBeforeLoadBinaryCode,
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generateBeforeCompileStreaming,
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supportsStreaming
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}) {
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super("wasm compile", RuntimeModule.STAGE_NORMAL);
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/** @type {GenerateLoadBinaryCode} */
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this.generateLoadBinaryCode = generateLoadBinaryCode;
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/** @type {GenerateBeforeLoadBinaryCode | undefined} */
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this.generateBeforeLoadBinaryCode = generateBeforeLoadBinaryCode;
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/** @type {GenerateBeforeCompileStreaming | undefined} */
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this.generateBeforeCompileStreaming = generateBeforeCompileStreaming;
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/** @type {boolean} */
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this.supportsStreaming = supportsStreaming;
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}
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/**
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* Generates runtime code for this runtime module.
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* @returns {string | null} runtime code
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*/
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generate() {
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const compilation = /** @type {Compilation} */ (this.compilation);
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const chunk = /** @type {Chunk} */ (this.chunk);
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const { outputOptions, runtimeTemplate } = compilation;
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const fn = RuntimeGlobals.compileWasm;
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const wasmModuleSrcPath = compilation.getPath(
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JSON.stringify(outputOptions.webassemblyModuleFilename),
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{
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hash: `" + ${RuntimeGlobals.getFullHash}() + "`,
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hashWithLength: (length) =>
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`" + ${RuntimeGlobals.getFullHash}}().slice(0, ${length}) + "`,
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module: {
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id: '" + wasmModuleId + "',
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hash: '" + wasmModuleHash + "',
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hashWithLength(length) {
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return `" + wasmModuleHash.slice(0, ${length}) + "`;
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}
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},
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runtime: chunk.runtime
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}
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);
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const loader = this.generateLoadBinaryCode(wasmModuleSrcPath);
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// Fallback path: fetch -> arrayBuffer -> WebAssembly.compile
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const fallback = [
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`.then(${runtimeTemplate.returningFunction("x.arrayBuffer()", "x")})`,
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`.then(${runtimeTemplate.returningFunction(
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"WebAssembly.compile(bytes)",
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"bytes"
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)})`
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];
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const getStreaming = () => {
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/**
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* @param {string[]} text text
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* @returns {string} merged text
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*/
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const concat = (...text) => text.join("");
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return [
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this.generateBeforeLoadBinaryCode
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? this.generateBeforeLoadBinaryCode(wasmModuleSrcPath)
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: "",
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`var req = ${loader};`,
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`var fallback = ${runtimeTemplate.returningFunction(
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Template.asString(["req", Template.indent(fallback)])
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)};`,
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concat(
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"return req.then(",
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runtimeTemplate.basicFunction("res", [
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'if (typeof WebAssembly.compileStreaming === "function") {',
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Template.indent(
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this.generateBeforeCompileStreaming
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? this.generateBeforeCompileStreaming()
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: ""
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),
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Template.indent([
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"return WebAssembly.compileStreaming(res)",
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Template.indent([
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".catch(",
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Template.indent([
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runtimeTemplate.basicFunction("e", [
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'if(res.headers.get("Content-Type") !== "application/wasm") {',
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Template.indent([
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'console.warn("`WebAssembly.compileStreaming` failed because your server does not serve wasm with `application/wasm` MIME type. Falling back to `WebAssembly.compile` which is slower. Original error:\\n", e);',
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"return fallback();"
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]),
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"}",
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"throw e;"
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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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"return fallback();"
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]),
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");"
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)
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];
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};
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return `${fn} = ${runtimeTemplate.basicFunction(
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"wasmModuleId, wasmModuleHash",
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this.supportsStreaming
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? getStreaming()
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: [
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this.generateBeforeLoadBinaryCode
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? this.generateBeforeLoadBinaryCode(wasmModuleSrcPath)
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: "",
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`return ${loader}`,
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`${Template.indent(fallback)};`
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]
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)};`;
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}
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}
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module.exports = AsyncWasmCompileRuntimeModule;
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