setupWriteToDisk.js
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"use strict";
const fs = require("fs");
const path = require("path");
/** @typedef {import("webpack").Compiler} Compiler */
/** @typedef {import("webpack").MultiCompiler} MultiCompiler */
/** @typedef {import("webpack").Compilation} Compilation */
/** @typedef {import("../index.js").IncomingMessage} IncomingMessage */
/** @typedef {import("../index.js").ServerResponse} ServerResponse */
/**
* @template {IncomingMessage} Request
* @template {ServerResponse} Response
* @param {import("../index.js").Context<Request, Response>} context
*/
function setupWriteToDisk(context) {
/**
* @type {Compiler[]}
*/
const compilers =
/** @type {MultiCompiler} */
context.compiler.compilers || [context.compiler];
for (const compiler of compilers) {
compiler.hooks.emit.tap("DevMiddleware",
/**
* @param {Compilation} compilation
*/
compilation => {
// @ts-ignore
if (compiler.hasWebpackDevMiddlewareAssetEmittedCallback) {
return;
}
compiler.hooks.assetEmitted.tapAsync("DevMiddleware", (file, info, callback) => {
/**
* @type {string}
*/
let targetPath;
/**
* @type {Buffer}
*/
let content; // webpack@5
if (info.compilation) {
({
targetPath,
content
} = info);
} else {
let targetFile = file;
const queryStringIdx = targetFile.indexOf("?");
if (queryStringIdx >= 0) {
targetFile = targetFile.slice(0, queryStringIdx);
}
let {
outputPath
} = compiler;
outputPath = compilation.getPath(outputPath, {}); // @ts-ignore
content = info;
targetPath = path.join(outputPath, targetFile);
}
const {
writeToDisk: filter
} = context.options;
const allowWrite = filter && typeof filter === "function" ? filter(targetPath) : true;
if (!allowWrite) {
return callback();
}
const dir = path.dirname(targetPath);
const name = compiler.options.name ? `Child "${compiler.options.name}": ` : "";
return fs.mkdir(dir, {
recursive: true
}, mkdirError => {
if (mkdirError) {
context.logger.error(`${name}Unable to write "${dir}" directory to disk:\n${mkdirError}`);
return callback(mkdirError);
}
return fs.writeFile(targetPath, content, writeFileError => {
if (writeFileError) {
context.logger.error(`${name}Unable to write "${targetPath}" asset to disk:\n${writeFileError}`);
return callback(writeFileError);
}
context.logger.log(`${name}Asset written to disk: "${targetPath}"`);
return callback();
});
});
}); // @ts-ignore
compiler.hasWebpackDevMiddlewareAssetEmittedCallback = true;
});
}
}
module.exports = setupWriteToDisk;