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setupOutputFileSystem.js
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setupOutputFileSystem.js
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const memfs = require("memfs");
/** @typedef {import("webpack").MultiCompiler} MultiCompiler */
/** @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 setupOutputFileSystem(context) {
let outputFileSystem;
if (context.options.outputFileSystem) {
const { outputFileSystem: outputFileSystemFromOptions } = context.options;
outputFileSystem = outputFileSystemFromOptions;
}
// Don't use `memfs` when developer wants to write everything to a disk, because it doesn't make sense.
else if (context.options.writeToDisk !== true) {
outputFileSystem = memfs.createFsFromVolume(new memfs.Volume());
} else {
const isMultiCompiler =
/** @type {MultiCompiler} */
(context.compiler).compilers;
if (isMultiCompiler) {
// Prefer compiler with `devServer` option or fallback on the first
// TODO we need to support webpack-dev-server as a plugin or revisit it
const compiler =
/** @type {MultiCompiler} */
(context.compiler).compilers.filter((item) =>
Object.prototype.hasOwnProperty.call(item.options, "devServer"),
);
({ outputFileSystem } =
compiler[0] ||
/** @type {MultiCompiler} */
(context.compiler).compilers[0]);
} else {
({ outputFileSystem } = context.compiler);
}
}
const compilers =
/** @type {MultiCompiler} */
(context.compiler).compilers || [context.compiler];
for (const compiler of compilers) {
compiler.outputFileSystem = outputFileSystem;
}
// @ts-ignore
// eslint-disable-next-line no-param-reassign
context.outputFileSystem = outputFileSystem;
}
module.exports = setupOutputFileSystem;