adding some random types

lib/FileSystemInfo.js

@@ -7,6 +7,9 @@
 
 const AsyncQueue = require("./util/AsyncQueue");
 
+/** @typedef {import("./WebpackError")} WebpackError */
+/** @typedef {import("./util/fs").InputFileSystem} InputFileSystem */
+
 let FS_ACCURACY = 2000;
 
 /**
@@ -15,6 +18,14 @@ let FS_ACCURACY = 2000;
  * @property {number} timestamp
  */
 
+/**
+ * @typedef {Object} Snapshot
+ * @property {number} startTime
+ * @property {Map<string, FileSystemInfoEntry | "error">} fileTimestamps
+ * @property {Map<string, FileSystemInfoEntry | "error">} contextTimestamps
+ * @property {Map<string, FileSystemInfoEntry | "error">} missingTimestamps
+ */
+
 /* istanbul ignore next */
 const applyMtime = mtime => {
 	if (FS_ACCURACY > 1 && mtime % 2 !== 0) FS_ACCURACY = 1;
@@ -24,6 +35,9 @@ const applyMtime = mtime => {
 };
 
 class FileSystemInfo {
+	/**
+	 * @param {InputFileSystem} fs file system
+	 */
 	constructor(fs) {
 		this.fs = fs;
 		/** @type {Map<string, FileSystemInfoEntry | null>} */
@@ -64,7 +78,7 @@ class FileSystemInfo {
 
 	/**
 	 * @param {string} path file path
-	 * @param {function(Error=, FileSystemInfoEntry=): void} callback callback function
+	 * @param {function(WebpackError=, FileSystemInfoEntry=): void} callback callback function
 	 * @returns {void}
 	 */
 	getFileTimestamp(path, callback) {
@@ -75,7 +89,7 @@ class FileSystemInfo {
 
 	/**
 	 * @param {string} path context path
-	 * @param {function(Error=, FileSystemInfoEntry=): void} callback callback function
+	 * @param {function(WebpackError=, FileSystemInfoEntry=): void} callback callback function
 	 * @returns {void}
 	 */
 	getContextTimestamp(path, callback) {
@@ -84,9 +98,22 @@ class FileSystemInfo {
 		this.contextTimestampQueue.add(path, callback);
 	}
 
+	/**
+	 *
+	 * @param {number} startTime when processing the files has started
+	 * @param {Iterable<string>} files all files
+	 * @param {Iterable<string>} directories all directories
+	 * @param {Iterable<string>} missing all missing files or directories
+	 * @param {Object} options options object (for future extensions)
+	 * @param {function(WebpackError=, Snapshot=): void} callback callback function
+	 * @returns {void}
+	 */
 	createSnapshot(startTime, files, directories, missing, options, callback) {
+		/** @type {Map<string, FileSystemInfoEntry | "error">} */
 		const fileTimestamps = new Map();
+		/** @type {Map<string, FileSystemInfoEntry | "error">} */
 		const contextTimestamps = new Map();
+		/** @type {Map<string, FileSystemInfoEntry | "error">} */
 		const missingTimestamps = new Map();
 		let jobs = 1;
 		const jobDone = () => {
@@ -144,6 +171,11 @@ class FileSystemInfo {
 		jobDone();
 	}
 
+	/**
+	 * @param {Snapshot} snapshot the snapshot made
+	 * @param {function(WebpackError=, boolean=): void} callback callback function
+	 * @returns {void}
+	 */
 	checkSnapshotValid(snapshot, callback) {
 		const {
 			startTime,
@@ -163,6 +195,11 @@ class FileSystemInfo {
 				callback(null, false);
 			}
 		};
+		/**
+		 * @param {FileSystemInfoEntry} current current entry
+		 * @param {FileSystemInfoEntry | "error"} snap entry from snapshot
+		 * @returns {boolean} true, if ok
+		 */
 		const checkExistance = (current, snap) => {
 			if (snap === "error") {
 				// If there was an error while snapshotting (i. e. EBUSY)
@@ -171,6 +208,11 @@ class FileSystemInfo {
 			}
 			return !current === !snap;
 		};
+		/**
+		 * @param {FileSystemInfoEntry} current current entry
+		 * @param {FileSystemInfoEntry | "error"} snap entry from snapshot
+		 * @returns {boolean} true, if ok
+		 */
 		const checkFile = (current, snap) => {
 			if (snap === "error") {
 				// If there was an error while snapshotting (i. e. EBUSY)

lib/cache/ResolverCachePlugin.js

@@ -8,7 +8,21 @@
 /** @typedef {import("enhanced-resolve/lib/Resolver")} Resolver */
 /** @typedef {import("../Compiler")} Compiler */
 /** @typedef {import("../FileSystemInfo")} FileSystemInfo */
+/** @typedef {import("../FileSystemInfo").Snapshot} Snapshot */
 
+/**
+ * @typedef {Object} CacheEntry
+ * @property {Object} result
+ * @property {Set<string>} fileDependencies
+ * @property {Set<string>} contextDependencies
+ * @property {Set<string>} missingDependencies
+ * @property {Snapshot} snapshot
+ */
+
+/**
+ * @param {Object} request a request
+ * @returns {string} stringified version
+ */
 const requestToString = request => {
 	let str = "";
 	for (const key in request) {
@@ -34,6 +48,15 @@ class ResolverCachePlugin {
 		compiler.hooks.thisCompilation.tap("ResolverCachePlugin", compilation => {
 			fileSystemInfo = compilation.fileSystemInfo;
 		});
+		/**
+		 * @param {string} identifier cache key
+		 * @param {string} type resolver type
+		 * @param {Resolver} resolver the resolver
+		 * @param {Object} resolveContext context for resolving meta info
+		 * @param {Object} request the request info object
+		 * @param {function(Error=, Object=): void} callback callback function
+		 * @returns {void}
+		 */
 		const doRealResolve = (
 			identifier,
 			type,
@@ -89,7 +112,7 @@ class ResolverCachePlugin {
 							cache.store(
 								identifier,
 								null,
-								{
+								/** @type {CacheEntry} */ {
 									result,
 									fileDependencies: newResolveContext.fileDependencies,
 									contextDependencies: newResolveContext.contextDependencies,
@@ -130,6 +153,11 @@ class ResolverCachePlugin {
 								const identifier = `/resolve/${type}${requestToString(
 									request
 								)}`;
+								/**
+								 * @param {Error=} err error if any
+								 * @param {CacheEntry=} cacheEntry cache entry
+								 * @returns {void}
+								 */
 								const processCacheResult = (err, cacheEntry) => {
 									if (err) return callback(err);
 

lib/util/findGraphRoots.js

@@ -11,26 +11,39 @@ const DONE_MARKER = 2;
 const DONE_MAYBE_ROOT_CYCLE_MARKER = 3;
 const DONE_AND_ROOT_MARKER = 4;
 
+/**
+ * @template T
+ */
 class Node {
+	/**
+	 * @param {T} item the value of the node
+	 */
 	constructor(item) {
 		this.item = item;
+		/** @type {Set<Node<T>>} */
 		this.dependencies = new Set();
 		this.marker = NO_MARKER;
+		/** @type {Cycle<T> | undefined} */
 		this.cycle = undefined;
 		this.incoming = 0;
 	}
 }
 
+/**
+ * @template T
+ */
 class Cycle {
 	constructor() {
+		/** @type {Set<Node<T>>} */
 		this.nodes = new Set();
 	}
 }
 
 /**
+ * @template T
  * @typedef {Object} StackEntry
- * @property {Node} node
- * @property {Node[]} openEdges
+ * @property {Node<T>} node
+ * @property {Node<T>[]} openEdges
  */
 
 /**
@@ -40,6 +53,7 @@ class Cycle {
  * @returns {Iterable<T>} graph roots of the items
  */
 module.exports = (items, getDependencies) => {
+	/** @type {Map<T, Node<T>>} */
 	const itemToNode = new Map();
 	for (const item of items) {
 		const node = new Node(item);
@@ -61,13 +75,13 @@ module.exports = (items, getDependencies) => {
 
 	// Set of current root modules
 	// items will be removed if a new reference to it has been found
-	/** @type {Set<Node>} */
+	/** @type {Set<Node<T>>} */
 	const roots = new Set();
 
 	// Set of current cycles without references to it
 	// cycles will be removed if a new reference to it has been found
 	// that is not part of the cycle
-	/** @type {Set<Cycle>} */
+	/** @type {Set<Cycle<T>>} */
 	const rootCycles = new Set();
 
 	// For all non-marked nodes
@@ -80,7 +94,7 @@ module.exports = (items, getDependencies) => {
 			selectedNode.marker = IN_PROGRESS_MARKER;
 
 			// keep a stack to avoid recursive walk
-			/** @type {StackEntry[]} */
+			/** @type {StackEntry<T>[]} */
 			const stack = [
 				{
 					node: selectedNode,
@@ -185,6 +199,7 @@ module.exports = (items, getDependencies) => {
 	// inside of the cycle
 	for (const cycle of rootCycles) {
 		let max = 0;
+		/** @type {Set<Node<T>>} */
 		const cycleRoots = new Set();
 		const nodes = cycle.nodes;
 		for (const node of nodes) {

tooling/type-coverage.js

@@ -15,17 +15,40 @@ const projectPaths = [
 	path.resolve(__dirname, "../declarations.d.ts")
 ];
 
+/**
+ * @param {string} file filename
+ * @returns {boolean} true, when file is part of the project
+ */
 const isProjectFile = file => {
 	return projectPaths.some(p =>
 		file.toLowerCase().startsWith(p.replace(/\\/g, "/").toLowerCase())
 	);
 };
 
+/**
+ * @typedef {Object} Location
+ * @property {number} line
+ * @property {number} column
+ */
+
+/**
+ * @typedef {Object} FileReport
+ * @property {string} path
+ * @property {Record<number, { start: Location, end: Location }>} statementMap
+ * @property {{}} fnMap
+ * @property {{}} branchMap
+ * @property {Record<number, number>} s
+ * @property {{}} f
+ * @property {{}} b
+ */
+
+/** @type {Record<string, FileReport>} */
 const coverageReport = Object.create(null);
 
 for (const sourceFile of program.getSourceFiles()) {
 	let file = sourceFile.fileName;
 	if (isProjectFile(file)) {
+		/** @type {FileReport} */
 		const rep = {
 			path: path.sep !== "/" ? file.replace(/\//g, path.sep) : file,
 			statementMap: {},