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ReadFileCompileAsyncWasmPlugin.js
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Thu, Feb 13, 18:54

ReadFileCompileAsyncWasmPlugin.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 Template = require("../Template");
const AsyncWasmChunkLoadingRuntimeModule = require("../wasm-async/AsyncWasmChunkLoadingRuntimeModule");
/** @typedef {import("../Compiler")} Compiler */
class ReadFileCompileAsyncWasmPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.thisCompilation.tap(
"ReadFileCompileAsyncWasmPlugin",
compilation => {
const globalWasmLoading = compilation.outputOptions.wasmLoading;
const isEnabledForChunk = chunk => {
const options = chunk.getEntryOptions();
const wasmLoading =
(options && options.wasmLoading) || globalWasmLoading;
return wasmLoading === "async-node";
};
const generateLoadBinaryCode = path =>
Template.asString([
"new Promise(function (resolve, reject) {",
Template.indent([
"var { readFile } = require('fs');",
"var { join } = require('path');",
"",
"try {",
Template.indent([
`readFile(join(__dirname, ${path}), function(err, buffer){`,
Template.indent([
"if (err) return reject(err);",
"",
"// Fake fetch response",
"resolve({",
Template.indent(["arrayBuffer() { return buffer; }"]),
"});"
]),
"});"
]),
"} catch (err) { reject(err); }"
]),
"})"
]);
compilation.hooks.runtimeRequirementInTree
.for(RuntimeGlobals.instantiateWasm)
.tap("ReadFileCompileAsyncWasmPlugin", (chunk, set) => {
if (!isEnabledForChunk(chunk)) return;
const chunkGraph = compilation.chunkGraph;
if (
!chunkGraph.hasModuleInGraph(
chunk,
m => m.type === "webassembly/async"
)
) {
return;
}
set.add(RuntimeGlobals.publicPath);
compilation.addRuntimeModule(
chunk,
new AsyncWasmChunkLoadingRuntimeModule({
generateLoadBinaryCode,
supportsStreaming: false
})
);
});
}
);
}
}
module.exports = ReadFileCompileAsyncWasmPlugin;

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