make filesystem types compatible with memfs and normal fs

fixes #12400

lib/Compiler.js

@@ -724,7 +724,10 @@ ${other}`);
 								return this.outputFileSystem.readFile(
 									targetPath,
 									(err, existingContent) => {
-										if (err || !content.equals(existingContent)) {
+										if (
+											err ||
+											!content.equals(/** @type {Buffer} */ (existingContent))
+										) {
 											return doWrite(content);
 										} else {
 											return alreadyWritten();

lib/ContextModuleFactory.js

@@ -298,11 +298,13 @@ module.exports = class ContextModuleFactory extends ModuleFactory {
 		const addDirectory = (directory, addSubDirectory, callback) => {
 			fs.readdir(directory, (err, files) => {
 				if (err) return callback(err);
-				files = files.map(file => file.normalize("NFC"));
+				const processedFiles = cmf.hooks.contextModuleFiles.call(
-				files = cmf.hooks.contextModuleFiles.call(files);
+					/** @type {string[]} */ (files).map(file => file.normalize("NFC"))
-				if (!files || files.length === 0) return callback(null, []);
+				);
+				if (!processedFiles || processedFiles.length === 0)
+					return callback(null, []);
 				asyncLib.map(
-					files.filter(p => p.indexOf(".") !== 0),
+					processedFiles.filter(p => p.indexOf(".") !== 0),
 					(segment, callback) => {
 						const subResource = join(fs, directory, segment);
 

lib/FileSystemInfo.js

@@ -1171,8 +1171,9 @@ class FileSystemInfo {
 							callback();
 							break;
 						}
-						this.fs.realpath(path, (err, realPath) => {
+						this.fs.realpath(path, (err, _realPath) => {
 							if (err) return callback(err);
+							const realPath = /** @type {string} */ (_realPath);
 							if (realPath !== path) {
 								resolveFiles.add(path);
 							}
@@ -1192,8 +1193,9 @@ class FileSystemInfo {
 							callback();
 							break;
 						}
-						this.fs.realpath(path, (err, realPath) => {
+						this.fs.realpath(path, (err, _realPath) => {
 							if (err) return callback(err);
+							const realPath = /** @type {string} */ (_realPath);
 							if (realPath !== path) {
 								resolveFiles.add(path);
 							}
@@ -2405,7 +2407,7 @@ class FileSystemInfo {
 	}
 
 	_readContextTimestamp(path, callback) {
-		this.fs.readdir(path, (err, files) => {
+		this.fs.readdir(path, (err, _files) => {
 			if (err) {
 				if (err.code === "ENOENT") {
 					this._contextTimestamps.set(path, null);
@@ -2414,7 +2416,7 @@ class FileSystemInfo {
 				}
 				return callback(err);
 			}
-			files = files
+			const files = /** @type {string[]} */ (_files)
 				.map(file => file.normalize("NFC"))
 				.filter(file => !/^\./.test(file))
 				.sort();
@@ -2501,7 +2503,7 @@ class FileSystemInfo {
 	}
 
 	_readContextHash(path, callback) {
-		this.fs.readdir(path, (err, files) => {
+		this.fs.readdir(path, (err, _files) => {
 			if (err) {
 				if (err.code === "ENOENT") {
 					this._contextHashes.set(path, null);
@@ -2509,7 +2511,7 @@ class FileSystemInfo {
 				}
 				return callback(err);
 			}
-			files = files
+			const files = /** @type {string[]} */ (_files)
 				.map(file => file.normalize("NFC"))
 				.filter(file => !/^\./.test(file))
 				.sort();
@@ -2624,7 +2626,9 @@ class FileSystemInfo {
 				return callback(err);
 			}
 			const set = new Set(
-				elements.map(element => join(this.fs, path, element))
+				/** @type {string[]} */ (elements).map(element =>
+					join(this.fs, path, element)
+				)
 			);
 			callback(null, set);
 		});

lib/serialization/FileMiddleware.js

@@ -441,7 +441,7 @@ class FileMiddleware extends SerializerMiddleware {
 						reject(err);
 						return;
 					}
-					let remaining = stats.size;
+					let remaining = /** @type {number} */ (stats.size);
 					let currentBuffer;
 					let currentBufferUsed;
 					const buf = [];

lib/util/fs.js

@@ -7,17 +7,57 @@
 
 const path = require("path");
 
-/** @typedef {import("fs").Stats} NodeFsStats */
 /** @typedef {import("../../declarations/WebpackOptions").WatchOptions} WatchOptions */
 /** @typedef {import("../FileSystemInfo").FileSystemInfoEntry} FileSystemInfoEntry */
 
+/**
+ * @typedef {Object} IStats
+ * @property {() => boolean} isFile
+ * @property {() => boolean} isDirectory
+ * @property {() => boolean} isBlockDevice
+ * @property {() => boolean} isCharacterDevice
+ * @property {() => boolean} isSymbolicLink
+ * @property {() => boolean} isFIFO
+ * @property {() => boolean} isSocket
+ * @property {number | bigint} dev
+ * @property {number | bigint} ino
+ * @property {number | bigint} mode
+ * @property {number | bigint} nlink
+ * @property {number | bigint} uid
+ * @property {number | bigint} gid
+ * @property {number | bigint} rdev
+ * @property {number | bigint} size
+ * @property {number | bigint} blksize
+ * @property {number | bigint} blocks
+ * @property {number | bigint} atimeMs
+ * @property {number | bigint} mtimeMs
+ * @property {number | bigint} ctimeMs
+ * @property {number | bigint} birthtimeMs
+ * @property {Date} atime
+ * @property {Date} mtime
+ * @property {Date} ctime
+ * @property {Date} birthtime
+ */
+
+/**
+ * @typedef {Object} IDirent
+ * @property {() => boolean} isFile
+ * @property {() => boolean} isDirectory
+ * @property {() => boolean} isBlockDevice
+ * @property {() => boolean} isCharacterDevice
+ * @property {() => boolean} isSymbolicLink
+ * @property {() => boolean} isFIFO
+ * @property {() => boolean} isSocket
+ * @property {string | Buffer} name
+ */
+
 /** @typedef {function(NodeJS.ErrnoException=): void} Callback */
 /** @typedef {function(NodeJS.ErrnoException=, Buffer=): void} BufferCallback */
 /** @typedef {function(NodeJS.ErrnoException=, Buffer|string=): void} BufferOrStringCallback */
-/** @typedef {function(NodeJS.ErrnoException=, string[]=): void} StringArrayCallback */
+/** @typedef {function(NodeJS.ErrnoException=, (string | Buffer)[] | IDirent[]=): void} DirentArrayCallback */
 /** @typedef {function(NodeJS.ErrnoException=, string=): void} StringCallback */
 /** @typedef {function(NodeJS.ErrnoException=, number=): void} NumberCallback */
-/** @typedef {function(NodeJS.ErrnoException=, NodeFsStats=): void} StatsCallback */
+/** @typedef {function(NodeJS.ErrnoException=, IStats=): void} StatsCallback */
 /** @typedef {function((NodeJS.ErrnoException | Error)=, any=): void} ReadJsonCallback */
 
 /**
@@ -45,7 +85,7 @@ const path = require("path");
  * @property {function(string, Buffer|string, Callback): void} writeFile
  * @property {function(string, Callback): void} mkdir
  * @property {function(string, StatsCallback): void} stat
- * @property {function(string, BufferCallback): void} readFile
+ * @property {function(string, BufferOrStringCallback): void} readFile
  * @property {(function(string, string): string)=} join
  * @property {(function(string, string): string)=} relative
  * @property {(function(string): string)=} dirname
@@ -53,12 +93,12 @@ const path = require("path");
 
 /**
  * @typedef {Object} InputFileSystem
- * @property {function(string, BufferCallback): void} readFile
+ * @property {function(string, BufferOrStringCallback): void} readFile
  * @property {(function(string, ReadJsonCallback): void)=} readJson
  * @property {function(string, BufferOrStringCallback): void} readlink
- * @property {function(string, StringArrayCallback): void} readdir
+ * @property {function(string, DirentArrayCallback): void} readdir
  * @property {function(string, StatsCallback): void} stat
- * @property {(function(string, StringCallback): void)=} realpath
+ * @property {(function(string, BufferOrStringCallback): void)=} realpath
  * @property {(function(string=): void)=} purge
  * @property {(function(string, string): string)=} join
  * @property {(function(string, string): string)=} relative
@@ -73,7 +113,7 @@ const path = require("path");
 /**
  * @typedef {Object} IntermediateFileSystemExtras
  * @property {function(string): void} mkdirSync
- * @property {function(string): import("fs").WriteStream} createWriteStream
+ * @property {function(string): NodeJS.WritableStream} createWriteStream
  * @property {function(string, string, NumberCallback): void} open
  * @property {function(number, Buffer, number, number, number, NumberCallback): void} read
  * @property {function(number, Callback): void} close

test/configCases/types/filesystems/test.filter.js

@@ -0,0 +1 @@
+module.exports = () => false;

test/configCases/types/filesystems/webpack.config.js

@@ -0,0 +1,17 @@
+const memfs = require("memfs");
+const fs = require("fs");
+
+/** @type {import("../../../../").Configuration} */
+module.exports = {
+	plugins: [
+		compiler => {
+			compiler.outputFileSystem = memfs.fs;
+			compiler.inputFileSystem = memfs.fs;
+			compiler.intermediateFileSystem = memfs.fs;
+
+			compiler.outputFileSystem = fs;
+			compiler.inputFileSystem = fs;
+			compiler.intermediateFileSystem = fs;
+		}
+	]
+};

types.d.ts

@@ -77,7 +77,6 @@ import {
 	WithStatement,
 	YieldExpression
 } from "estree";
-import { Stats as FsStats, WriteStream } from "fs";
 import { JSONSchema4, JSONSchema6, JSONSchema7 } from "json-schema";
 import { default as ValidationError } from "schema-utils/declarations/ValidationError";
 import {
@@ -3765,6 +3764,43 @@ declare class HttpsUriPlugin {
 	 */
 	apply(compiler: Compiler): void;
 }
+declare interface IDirent {
+	isFile: () => boolean;
+	isDirectory: () => boolean;
+	isBlockDevice: () => boolean;
+	isCharacterDevice: () => boolean;
+	isSymbolicLink: () => boolean;
+	isFIFO: () => boolean;
+	isSocket: () => boolean;
+	name: string | Buffer;
+}
+declare interface IStats {
+	isFile: () => boolean;
+	isDirectory: () => boolean;
+	isBlockDevice: () => boolean;
+	isCharacterDevice: () => boolean;
+	isSymbolicLink: () => boolean;
+	isFIFO: () => boolean;
+	isSocket: () => boolean;
+	dev: number | bigint;
+	ino: number | bigint;
+	mode: number | bigint;
+	nlink: number | bigint;
+	uid: number | bigint;
+	gid: number | bigint;
+	rdev: number | bigint;
+	size: number | bigint;
+	blksize: number | bigint;
+	blocks: number | bigint;
+	atimeMs: number | bigint;
+	mtimeMs: number | bigint;
+	ctimeMs: number | bigint;
+	birthtimeMs: number | bigint;
+	atime: Date;
+	mtime: Date;
+	ctime: Date;
+	birthtime: Date;
+}
 declare class IgnorePlugin {
 	constructor(options: IgnorePluginOptions);
 	options: IgnorePluginOptions;
@@ -3831,7 +3867,7 @@ declare abstract class InitFragment {
 declare interface InputFileSystem {
 	readFile: (
 		arg0: string,
-		arg1: (arg0?: NodeJS.ErrnoException, arg1?: Buffer) => void
+		arg1: (arg0?: NodeJS.ErrnoException, arg1?: string | Buffer) => void
 	) => void;
 	readJson?: (
 		arg0: string,
@@ -3843,15 +3879,18 @@ declare interface InputFileSystem {
 	) => void;
 	readdir: (
 		arg0: string,
-		arg1: (arg0?: NodeJS.ErrnoException, arg1?: string[]) => void
+		arg1: (
+			arg0?: NodeJS.ErrnoException,
+			arg1?: (string | Buffer)[] | IDirent[]
+		) => void
 	) => void;
 	stat: (
 		arg0: string,
-		arg1: (arg0?: NodeJS.ErrnoException, arg1?: FsStats) => void
+		arg1: (arg0?: NodeJS.ErrnoException, arg1?: IStats) => void
 	) => void;
 	realpath?: (
 		arg0: string,
-		arg1: (arg0?: NodeJS.ErrnoException, arg1?: string) => void
+		arg1: (arg0?: NodeJS.ErrnoException, arg1?: string | Buffer) => void
 	) => void;
 	purge?: (arg0?: string) => void;
 	join?: (arg0: string, arg1: string) => string;
@@ -3863,7 +3902,7 @@ type IntermediateFileSystem = InputFileSystem &
 	IntermediateFileSystemExtras;
 declare interface IntermediateFileSystemExtras {
 	mkdirSync: (arg0: string) => void;
-	createWriteStream: (arg0: string) => WriteStream;
+	createWriteStream: (arg0: string) => NodeJS.WritableStream;
 	open: (
 		arg0: string,
 		arg1: string,
@@ -6816,11 +6855,11 @@ declare interface OutputFileSystem {
 	mkdir: (arg0: string, arg1: (arg0?: NodeJS.ErrnoException) => void) => void;
 	stat: (
 		arg0: string,
-		arg1: (arg0?: NodeJS.ErrnoException, arg1?: FsStats) => void
+		arg1: (arg0?: NodeJS.ErrnoException, arg1?: IStats) => void
 	) => void;
 	readFile: (
 		arg0: string,
-		arg1: (arg0?: NodeJS.ErrnoException, arg1?: Buffer) => void
+		arg1: (arg0?: NodeJS.ErrnoException, arg1?: string | Buffer) => void
 	) => void;
 	join?: (arg0: string, arg1: string) => string;
 	relative?: (arg0: string, arg1: string) => string;