refactor(types): more

lib/Dependency.js

@@ -89,9 +89,9 @@ const getIgnoredModule = memoize(() => {
 
 class Dependency {
 	constructor() {
-		/** @type {Module} */
+		/** @type {Module | undefined} */
 		this._parentModule = undefined;
-		/** @type {DependenciesBlock} */
+		/** @type {DependenciesBlock | undefined} */
 		this._parentDependenciesBlock = undefined;
 		/** @type {number} */
 		this._parentDependenciesBlockIndex = -1;
@@ -174,6 +174,12 @@ class Dependency {
 		this._loc = loc;
 	}
 
+	/**
+	 * @param {number} startLine start line
+	 * @param {number} startColumn start column
+	 * @param {number} endLine end line
+	 * @param {number} endColumn end column
+	 */
 	setLoc(startLine, startColumn, endLine, endColumn) {
 		this._locSL = startLine;
 		this._locSC = startColumn;
@@ -247,7 +253,7 @@ class Dependency {
 	/**
 	 * Returns warnings
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} warnings
+	 * @returns {WebpackError[] | null | undefined} warnings
 	 */
 	getWarnings(moduleGraph) {
 		return null;
@@ -256,7 +262,7 @@ class Dependency {
 	/**
 	 * Returns errors
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} errors
+	 * @returns {WebpackError[] | null | undefined} errors
 	 */
 	getErrors(moduleGraph) {
 		return null;
@@ -288,7 +294,7 @@ class Dependency {
 
 	/**
 	 * @param {string} context context directory
-	 * @returns {Module} a module
+	 * @returns {Module | null} a module
 	 */
 	createIgnoredModule(context) {
 		return getIgnoredModule();

lib/DllEntryPlugin.js

@@ -9,6 +9,8 @@ const DllModuleFactory = require("./DllModuleFactory");
 const DllEntryDependency = require("./dependencies/DllEntryDependency");
 const EntryDependency = require("./dependencies/EntryDependency");
 
+/** @typedef {import("./Compiler")} Compiler */
+
 class DllEntryPlugin {
 	/**
 	 * @param {string} context context
@@ -21,6 +23,11 @@ class DllEntryPlugin {
 		this.options = options;
 	}
 
+	/**
+	 * Apply the plugin
+	 * @param {Compiler} compiler the compiler instance
+	 * @returns {void}
+	 */
 	apply(compiler) {
 		compiler.hooks.compilation.tap(
 			"DllEntryPlugin",

lib/ErrorHelpers.js

@@ -45,6 +45,7 @@ const cutOffMultilineMessage = (stack, message) => {
 	const stackSplitByLines = stack.split("\n");
 	const messageSplitByLines = message.split("\n");
 
+	/** @type {string[]} */
 	const result = [];
 
 	stackSplitByLines.forEach((line, idx) => {

lib/Module.js

@@ -444,7 +444,7 @@ class Module extends DependenciesBlock {
 
 	/**
 	 * @param {ModuleGraph} moduleGraph the module graph
-	 * @param {boolean} strict the importing module is strict
+	 * @param {boolean | undefined} strict the importing module is strict
 	 * @returns {"namespace" | "default-only" | "default-with-named" | "dynamic"} export type
 	 * "namespace": Exports is already a namespace object. namespace = exports.
 	 * "dynamic": Check at runtime if __esModule is set. When set: namespace = { ...exports, default: exports }. When not set: namespace = { default: exports }.

lib/RuntimeTemplate.js

@@ -396,7 +396,7 @@ class RuntimeTemplate {
 
 	/**
 	 * @param {Object} options options object
-	 * @param {Module} options.module the module
+	 * @param {Module | null} options.module the module
 	 * @param {ChunkGraph} options.chunkGraph the chunk graph
 	 * @param {string} options.request the request that should be printed as comment
 	 * @param {boolean=} options.weak if the dependency is weak (will create a nice error message)
@@ -439,7 +439,7 @@ class RuntimeTemplate {
 
 	/**
 	 * @param {Object} options options object
-	 * @param {Module} options.module the module
+	 * @param {Module | null} options.module the module
 	 * @param {ChunkGraph} options.chunkGraph the chunk graph
 	 * @param {string} options.request the request that should be printed as comment
 	 * @param {boolean=} options.weak if the dependency is weak (will create a nice error message)

lib/dependencies/ContextDependency.js

@@ -23,6 +23,10 @@ const getCriticalDependencyWarning = memoize(() =>
 
 /** @typedef {ContextOptions & { request: string }} ContextDependencyOptions */
 
+/**
+ * @param {RegExp | null | undefined} r regexp
+ * @returns {string} stringified regexp
+ */
 const regExpToString = r => (r ? r + "" : "");
 
 class ContextDependency extends Dependency {
@@ -93,7 +97,7 @@ class ContextDependency extends Dependency {
 	/**
 	 * Returns warnings
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} warnings
+	 * @returns {WebpackError[] | null | undefined} warnings
 	 */
 	getWarnings(moduleGraph) {
 		let warnings = super.getWarnings(moduleGraph);

lib/dependencies/CssImportDependency.js

@@ -74,7 +74,7 @@ class CssImportDependency extends ModuleDependency {
 
 	/**
 	 * @param {string} context context directory
-	 * @returns {Module} a module
+	 * @returns {Module | null} a module
 	 */
 	createIgnoredModule(context) {
 		return null;

lib/dependencies/CssLocalIdentifierDependency.js

@@ -75,6 +75,11 @@ class CssLocalIdentifierDependency extends NullDependency {
 	}
 }
 
+/**
+ * @param {string} str string
+ * @param {string | boolean} omitUnderscore true if you need to omit underscore
+ * @returns {string} escaped css identifier
+ */
 const escapeCssIdentifier = (str, omitUnderscore) => {
 	const escaped = `${str}`.replace(
 		// cspell:word uffff

lib/dependencies/CssUrlDependency.js

@@ -48,7 +48,7 @@ class CssUrlDependency extends ModuleDependency {
 
 	/**
 	 * @param {string} context context directory
-	 * @returns {Module} a module
+	 * @returns {Module | null} a module
 	 */
 	createIgnoredModule(context) {
 		const RawDataUrlModule = getRawDataUrlModule();
@@ -133,7 +133,7 @@ CssUrlDependency.Template = class CssUrlDependencyTemplate extends (
 				newValue = cssEscapeString(
 					runtimeTemplate.assetUrl({
 						publicPath: "",
-						module: moduleGraph.getModule(dep),
+						module: /** @type {Module} */ (moduleGraph.getModule(dep)),
 						codeGenerationResults
 					})
 				);
@@ -142,7 +142,7 @@ CssUrlDependency.Template = class CssUrlDependencyTemplate extends (
 				newValue = `url(${cssEscapeString(
 					runtimeTemplate.assetUrl({
 						publicPath: "",
-						module: moduleGraph.getModule(dep),
+						module: /** @type {Module} */ (moduleGraph.getModule(dep)),
 						codeGenerationResults
 					})
 				)})`;

lib/dependencies/DllEntryDependency.js

@@ -10,8 +10,13 @@ const makeSerializable = require("../util/makeSerializable");
 
 /** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
 /** @typedef {import("../serialization/ObjectMiddleware").ObjectSerializerContext} ObjectSerializerContext */
+/** @typedef {import("./EntryDependency")} EntryDependency */
 
 class DllEntryDependency extends Dependency {
+	/**
+	 * @param {EntryDependency[]} dependencies dependencies
+	 * @param {string} name name
+	 */
 	constructor(dependencies, name) {
 		super();
 

lib/dependencies/DynamicExports.js

@@ -5,6 +5,7 @@
 
 "use strict";
 
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
 /** @typedef {import("../Parser").ParserState} ParserState */
 
 /** @type {WeakMap<ParserState, boolean>} */
@@ -18,8 +19,9 @@ exports.bailout = parserState => {
 	const value = parserStateExportsState.get(parserState);
 	parserStateExportsState.set(parserState, false);
 	if (value === true) {
-		parserState.module.buildMeta.exportsType = undefined;
-		parserState.module.buildMeta.defaultObject = false;
+		const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
+		buildMeta.exportsType = undefined;
+		buildMeta.defaultObject = false;
 	}
 };
 
@@ -32,8 +34,9 @@ exports.enable = parserState => {
 	if (value === false) return;
 	parserStateExportsState.set(parserState, true);
 	if (value !== true) {
-		parserState.module.buildMeta.exportsType = "default";
-		parserState.module.buildMeta.defaultObject = "redirect";
+		const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
+		buildMeta.exportsType = "default";
+		buildMeta.defaultObject = "redirect";
 	}
 };
 
@@ -44,7 +47,7 @@ exports.enable = parserState => {
 exports.setFlagged = parserState => {
 	const value = parserStateExportsState.get(parserState);
 	if (value !== true) return;
-	const buildMeta = parserState.module.buildMeta;
+	const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
 	if (buildMeta.exportsType === "dynamic") return;
 	buildMeta.exportsType = "flagged";
 };
@@ -56,7 +59,8 @@ exports.setFlagged = parserState => {
 exports.setDynamic = parserState => {
 	const value = parserStateExportsState.get(parserState);
 	if (value !== true) return;
-	parserState.module.buildMeta.exportsType = "dynamic";
+	/** @type {BuildMeta} */
+	(parserState.module.buildMeta).exportsType = "dynamic";
 };
 
 /**

lib/dependencies/ExportsInfoDependency.js

@@ -51,19 +51,23 @@ const getProperty = (moduleGraph, module, exportName, property, runtime) => {
 	switch (property) {
 		case "canMangle": {
 			const exportsInfo = moduleGraph.getExportsInfo(module);
-			const exportInfo = exportsInfo.getExportInfo(exportName);
+			const exportInfo = exportsInfo.getExportInfo(
+				/** @type {string} */ (exportName)
+			);
 			if (exportInfo) return exportInfo.canMangle;
 			return exportsInfo.otherExportsInfo.canMangle;
 		}
 		case "used":
 			return (
-				moduleGraph.getExportsInfo(module).getUsed(exportName, runtime) !==
+				moduleGraph
+					.getExportsInfo(module)
+					.getUsed(/** @type {string} */ (exportName), runtime) !==
 				UsageState.Unused
 			);
 		case "useInfo": {
 			const state = moduleGraph
 				.getExportsInfo(module)
-				.getUsed(exportName, runtime);
+				.getUsed(/** @type {string} */ (exportName), runtime);
 			switch (state) {
 				case UsageState.Used:
 				case UsageState.OnlyPropertiesUsed:
@@ -79,7 +83,9 @@ const getProperty = (moduleGraph, module, exportName, property, runtime) => {
 			}
 		}
 		case "provideInfo":
-			return moduleGraph.getExportsInfo(module).isExportProvided(exportName);
+			return moduleGraph
+				.getExportsInfo(module)
+				.isExportProvided(/** @type {string} */ (exportName));
 	}
 	return undefined;
 };
@@ -108,6 +114,10 @@ class ExportsInfoDependency extends NullDependency {
 		super.serialize(context);
 	}
 
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 * @returns {ExportsInfoDependency} ExportsInfoDependency
+	 */
 	static deserialize(context) {
 		const obj = new ExportsInfoDependency(
 			context.read(),

lib/dependencies/HarmonyCompatibilityDependency.js

@@ -15,6 +15,7 @@ const NullDependency = require("./NullDependency");
 /** @typedef {import("../Dependency")} Dependency */
 /** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
 /** @typedef {import("../Module")} Module */
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
 
 class HarmonyCompatibilityDependency extends NullDependency {
 	get type() {
@@ -80,7 +81,7 @@ HarmonyCompatibilityDependency.Template = class HarmonyExportDependencyTemplate
 					0,
 					undefined,
 					`\n__webpack_async_result__();\n} catch(e) { __webpack_async_result__(e); } }${
-						module.buildMeta.async ? ", 1" : ""
+						/** @type {BuildMeta} */ (module.buildMeta).async ? ", 1" : ""
 					});`
 				)
 			);

lib/dependencies/HarmonyDetectionParserPlugin.js

@@ -10,6 +10,7 @@ const DynamicExports = require("./DynamicExports");
 const HarmonyCompatibilityDependency = require("./HarmonyCompatibilityDependency");
 const HarmonyExports = require("./HarmonyExports");
 
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
 /** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
 /** @typedef {import("./HarmonyModulesPlugin").HarmonyModulesPluginOptions} HarmonyModulesPluginOptions */
 
@@ -72,7 +73,8 @@ module.exports = class HarmonyDetectionParserPlugin {
 					"Top-level-await is only supported in EcmaScript Modules"
 				);
 			}
-			module.buildMeta.async = true;
+			/** @type {BuildMeta} */
+			(module.buildMeta).async = true;
 		});
 
 		/**

lib/dependencies/HarmonyEvaluatedImportSpecifierDependency.js

@@ -12,6 +12,8 @@ const HarmonyImportSpecifierDependency = require("./HarmonyImportSpecifierDepend
 /** @typedef {import("../ChunkGraph")} ChunkGraph */
 /** @typedef {import("../Dependency")} Dependency */
 /** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
+/** @typedef {import("../ModuleGraphConnection")} ModuleGraphConnection */
 /** @typedef {import("../javascript/JavascriptParser").Assertions} Assertions */
 /** @typedef {import("../javascript/JavascriptParser").Range} Range */
 /** @typedef {import("../serialization/ObjectMiddleware").ObjectDeserializerContext} ObjectDeserializerContext */
@@ -85,14 +87,19 @@ HarmonyEvaluatedImportSpecifierDependency.Template = class HarmonyEvaluatedImpor
 		// Skip rendering depending when dependency is conditional
 		if (connection && !connection.isTargetActive(runtime)) return;
 
-		const exportsInfo = moduleGraph.getExportsInfo(connection.module);
+		const exportsInfo = moduleGraph.getExportsInfo(
+			/** @type {ModuleGraphConnection} */ (connection).module
+		);
 		const ids = dep.getIds(moduleGraph);
 
 		let value;
 
-		const exportsType = connection.module.getExportsType(
+		const exportsType =
+			/** @type {ModuleGraphConnection} */
+			(connection).module.getExportsType(
 				moduleGraph,
-			module.buildMeta.strictHarmonyModule
+				/** @type {BuildMeta} */
+				(module.buildMeta).strictHarmonyModule
 			);
 		switch (exportsType) {
 			case "default-with-named": {

lib/dependencies/HarmonyExportImportedSpecifierDependency.js

@@ -756,7 +756,7 @@ class HarmonyExportImportedSpecifierDependency extends HarmonyImportDependency {
 	/**
 	 * Returns warnings
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} warnings
+	 * @returns {WebpackError[] | null | undefined} warnings
 	 */
 	getWarnings(moduleGraph) {
 		const exportsPresence = this._getEffectiveExportPresenceLevel(moduleGraph);
@@ -769,7 +769,7 @@ class HarmonyExportImportedSpecifierDependency extends HarmonyImportDependency {
 	/**
 	 * Returns errors
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} errors
+	 * @returns {WebpackError[] | null | undefined} errors
 	 */
 	getErrors(moduleGraph) {
 		const exportsPresence = this._getEffectiveExportPresenceLevel(moduleGraph);

lib/dependencies/HarmonyExports.js

@@ -7,6 +7,8 @@
 
 const RuntimeGlobals = require("../RuntimeGlobals");
 
+/** @typedef {import("../Module").BuildInfo} BuildInfo */
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
 /** @typedef {import("../Parser").ParserState} ParserState */
 
 /** @type {WeakMap<ParserState, boolean>} */
@@ -22,12 +24,14 @@ exports.enable = (parserState, isStrictHarmony) => {
 	if (value === false) return;
 	parserStateExportsState.set(parserState, true);
 	if (value !== true) {
-		parserState.module.buildMeta.exportsType = "namespace";
-		parserState.module.buildInfo.strict = true;
-		parserState.module.buildInfo.exportsArgument = RuntimeGlobals.exports;
+		const buildMeta = /** @type {BuildMeta} */ (parserState.module.buildMeta);
+		buildMeta.exportsType = "namespace";
+		const buildInfo = /** @type {BuildInfo} */ (parserState.module.buildInfo);
+		buildInfo.strict = true;
+		buildInfo.exportsArgument = RuntimeGlobals.exports;
 		if (isStrictHarmony) {
-			parserState.module.buildMeta.strictHarmonyModule = true;
-			parserState.module.buildInfo.moduleArgument = "__webpack_module__";
+			buildMeta.strictHarmonyModule = true;
+			buildInfo.moduleArgument = "__webpack_module__";
 		}
 	}
 };

lib/dependencies/HarmonyImportSpecifierDependency.js

@@ -209,7 +209,7 @@ class HarmonyImportSpecifierDependency extends HarmonyImportDependency {
 	/**
 	 * Returns warnings
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} warnings
+	 * @returns {WebpackError[] | null | undefined} warnings
 	 */
 	getWarnings(moduleGraph) {
 		const exportsPresence = this._getEffectiveExportPresenceLevel(moduleGraph);
@@ -222,7 +222,7 @@ class HarmonyImportSpecifierDependency extends HarmonyImportDependency {
 	/**
 	 * Returns errors
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} errors
+	 * @returns {WebpackError[] | null | undefined} errors
 	 */
 	getErrors(moduleGraph) {
 		const exportsPresence = this._getEffectiveExportPresenceLevel(moduleGraph);

lib/dependencies/HarmonyTopLevelThisParserPlugin.js

@@ -8,15 +8,27 @@
 const ConstDependency = require("./ConstDependency");
 const HarmonyExports = require("./HarmonyExports");
 
+/** @typedef {import("../Dependency").DependencyLocation} DependencyLocation */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("../javascript/JavascriptParser").Range} Range */
+
 class HarmonyTopLevelThisParserPlugin {
+	/**
+	 * @param {JavascriptParser} parser the parser
+	 * @returns {void}
+	 */
 	apply(parser) {
 		parser.hooks.expression
 			.for("this")
 			.tap("HarmonyTopLevelThisParserPlugin", node => {
 				if (!parser.scope.topLevelScope) return;
 				if (HarmonyExports.isEnabled(parser.state)) {
-					const dep = new ConstDependency("undefined", node.range, null);
-					dep.loc = node.loc;
+					const dep = new ConstDependency(
+						"undefined",
+						/** @type {Range} */ (node.range),
+						null
+					);
+					dep.loc = /** @type {DependencyLocation} */ (node.loc);
 					parser.state.module.addPresentationalDependency(dep);
 					return this;
 				}

lib/dependencies/ImportEagerDependency.js

@@ -12,6 +12,8 @@ const ImportDependency = require("./ImportDependency");
 /** @typedef {import("../Dependency")} Dependency */
 /** @typedef {import("../Dependency").ReferencedExport} ReferencedExport */
 /** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
 /** @typedef {import("../ModuleGraph")} ModuleGraph */
 /** @typedef {import("../javascript/JavascriptParser").Range} Range */
 
@@ -56,9 +58,9 @@ ImportEagerDependency.Template = class ImportEagerDependencyTemplate extends (
 		const dep = /** @type {ImportEagerDependency} */ (dependency);
 		const content = runtimeTemplate.moduleNamespacePromise({
 			chunkGraph,
-			module: moduleGraph.getModule(dep),
+			module: /** @type {Module} */ (moduleGraph.getModule(dep)),
 			request: dep.request,
-			strict: module.buildMeta.strictHarmonyModule,
+			strict: /** @type {BuildMeta} */ (module.buildMeta).strictHarmonyModule,
 			message: "import() eager",
 			runtimeRequirements
 		});

lib/dependencies/ImportWeakDependency.js

@@ -12,6 +12,8 @@ const ImportDependency = require("./ImportDependency");
 /** @typedef {import("../Dependency")} Dependency */
 /** @typedef {import("../Dependency").ReferencedExport} ReferencedExport */
 /** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("../Module").BuildMeta} BuildMeta */
 /** @typedef {import("../ModuleGraph")} ModuleGraph */
 /** @typedef {import("../javascript/JavascriptParser").Range} Range */
 
@@ -53,9 +55,9 @@ ImportWeakDependency.Template = class ImportDependencyTemplate extends (
 		const dep = /** @type {ImportWeakDependency} */ (dependency);
 		const content = runtimeTemplate.moduleNamespacePromise({
 			chunkGraph,
-			module: moduleGraph.getModule(dep),
+			module: /** @type {Module} */ (moduleGraph.getModule(dep)),
 			request: dep.request,
-			strict: module.buildMeta.strictHarmonyModule,
+			strict: /** @type {BuildMeta} */ (module.buildMeta).strictHarmonyModule,
 			message: "import() weak",
 			weak: true,
 			runtimeRequirements

lib/dependencies/ModuleDependency.js

@@ -58,7 +58,7 @@ class ModuleDependency extends Dependency {
 
 	/**
 	 * @param {string} context context directory
-	 * @returns {Module} a module
+	 * @returns {Module | null} a module
 	 */
 	createIgnoredModule(context) {
 		const RawModule = getRawModule();

lib/dependencies/ModuleDependencyTemplateAsId.js

@@ -10,6 +10,7 @@ const ModuleDependency = require("./ModuleDependency");
 /** @typedef {import("webpack-sources").ReplaceSource} ReplaceSource */
 /** @typedef {import("../Dependency")} Dependency */
 /** @typedef {import("../DependencyTemplate").DependencyTemplateContext} DependencyTemplateContext */
+/** @typedef {import("../Module")} Module */
 
 class ModuleDependencyTemplateAsId extends ModuleDependency.Template {
 	/**
@@ -22,7 +23,7 @@ class ModuleDependencyTemplateAsId extends ModuleDependency.Template {
 		const dep = /** @type {ModuleDependency} */ (dependency);
 		if (!dep.range) return;
 		const content = runtimeTemplate.moduleId({
-			module: moduleGraph.getModule(dep),
+			module: /** @type {Module} */ (moduleGraph.getModule(dep)),
 			chunkGraph,
 			request: dep.request,
 			weak: dep.weak

lib/dependencies/RequireIncludeDependencyParserPlugin.js

@@ -13,6 +13,10 @@ const {
 const makeSerializable = require("../util/makeSerializable");
 const RequireIncludeDependency = require("./RequireIncludeDependency");
 
+/** @typedef {import("../Dependency").DependencyLocation} DependencyLocation */
+/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
+/** @typedef {import("../javascript/JavascriptParser").Range} Range */
+
 module.exports = class RequireIncludeDependencyParserPlugin {
 	/**
 	 * @param {boolean} warn true: warn about deprecation, false: don't warn
@@ -20,6 +24,11 @@ module.exports = class RequireIncludeDependencyParserPlugin {
 	constructor(warn) {
 		this.warn = warn;
 	}
+
+	/**
+	 * @param {JavascriptParser} parser the parser
+	 * @returns {void}
+	 */
 	apply(parser) {
 		const { warn } = this;
 		parser.hooks.call
@@ -31,12 +40,17 @@ module.exports = class RequireIncludeDependencyParserPlugin {
 
 				if (warn) {
 					parser.state.module.addWarning(
-						new RequireIncludeDeprecationWarning(expr.loc)
+						new RequireIncludeDeprecationWarning(
+							/** @type {DependencyLocation} */ (expr.loc)
+						)
 					);
 				}
 
-				const dep = new RequireIncludeDependency(param.string, expr.range);
-				dep.loc = expr.loc;
+				const dep = new RequireIncludeDependency(
+					/** @type {string} */ (param.string),
+					/** @type {Range} */ (expr.range)
+				);
+				dep.loc = /** @type {DependencyLocation} */ (expr.loc);
 				parser.state.current.addDependency(dep);
 				return true;
 			});
@@ -45,7 +59,9 @@ module.exports = class RequireIncludeDependencyParserPlugin {
 			.tap("RequireIncludePlugin", expr => {
 				if (warn) {
 					parser.state.module.addWarning(
-						new RequireIncludeDeprecationWarning(expr.loc)
+						new RequireIncludeDeprecationWarning(
+							/** @type {DependencyLocation} */ (expr.loc)
+						)
 					);
 				}
 				return evaluateToString("function")(expr);
@@ -55,7 +71,9 @@ module.exports = class RequireIncludeDependencyParserPlugin {
 			.tap("RequireIncludePlugin", expr => {
 				if (warn) {
 					parser.state.module.addWarning(
-						new RequireIncludeDeprecationWarning(expr.loc)
+						new RequireIncludeDeprecationWarning(
+							/** @type {DependencyLocation} */ (expr.loc)
+						)
 					);
 				}
 				return toConstantDependency(parser, JSON.stringify("function"))(expr);
@@ -64,6 +82,9 @@ module.exports = class RequireIncludeDependencyParserPlugin {
 };
 
 class RequireIncludeDeprecationWarning extends WebpackError {
+	/**
+	 * @param {DependencyLocation} loc location
+	 */
 	constructor(loc) {
 		super("require.include() is deprecated and will be removed soon.");
 

lib/dependencies/RequireResolveHeaderDependency.js

@@ -38,6 +38,10 @@ class RequireResolveHeaderDependency extends NullDependency {
 		super.serialize(context);
 	}
 
+	/**
+	 * @param {ObjectDeserializerContext} context context
+	 * @returns {RequireResolveHeaderDependency} RequireResolveHeaderDependency
+	 */
 	static deserialize(context) {
 		const obj = new RequireResolveHeaderDependency(context.read());
 		obj.deserialize(context);
@@ -64,6 +68,11 @@ RequireResolveHeaderDependency.Template = class RequireResolveHeaderDependencyTe
 		source.replace(dep.range[0], dep.range[1] - 1, "/*require.resolve*/");
 	}
 
+	/**
+	 * @param {string} name name
+	 * @param {RequireResolveHeaderDependency} dep dependency
+	 * @param {ReplaceSource} source source
+	 */
 	applyAsTemplateArgument(name, dep, source) {
 		source.replace(dep.range[0], dep.range[1] - 1, "/*require.resolve*/");
 	}

lib/dependencies/SystemPlugin.js

@@ -22,7 +22,9 @@ const SystemRuntimeModule = require("./SystemRuntimeModule");
 
 /** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
 /** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Dependency").DependencyLocation} DependencyLocation */
 /** @typedef {import("../javascript/JavascriptParser")} Parser */
+/** @typedef {import("../javascript/JavascriptParser").Range} Range */
 
 const PLUGIN_NAME = "SystemPlugin";
 
@@ -58,6 +60,9 @@ class SystemPlugin {
 						return;
 					}
 
+					/**
+					 * @param {string} name name
+					 */
 					const setNotSupported = name => {
 						parser.hooks.evaluateTypeof
 							.for(name)
@@ -97,17 +102,21 @@ class SystemPlugin {
 					setNotSupported("System.register");
 
 					parser.hooks.expression.for("System").tap(PLUGIN_NAME, expr => {
-						const dep = new ConstDependency(RuntimeGlobals.system, expr.range, [
-							RuntimeGlobals.system
-						]);
-						dep.loc = expr.loc;
+						const dep = new ConstDependency(
+							RuntimeGlobals.system,
+							/** @type {Range} */ (expr.range),
+							[RuntimeGlobals.system]
+						);
+						dep.loc = /** @type {DependencyLocation} */ (expr.loc);
 						parser.state.module.addPresentationalDependency(dep);
 						return true;
 					});
 
 					parser.hooks.call.for("System.import").tap(PLUGIN_NAME, expr => {
 						parser.state.module.addWarning(
-							new SystemImportDeprecationWarning(expr.loc)
+							new SystemImportDeprecationWarning(
+								/** @type {DependencyLocation} */ (expr.loc)
+							)
 						);
 
 						return parser.hooks.importCall.call({
@@ -133,6 +142,9 @@ class SystemPlugin {
 }
 
 class SystemImportDeprecationWarning extends WebpackError {
+	/**
+	 * @param {DependencyLocation} loc location
+	 */
 	constructor(loc) {
 		super(
 			"System.import() is deprecated and will be removed soon. Use import() instead.\n" +

lib/dependencies/URLDependency.js

@@ -42,7 +42,7 @@ class URLDependency extends ModuleDependency {
 		this.range = range;
 		this.outerRange = outerRange;
 		this.relative = relative || false;
-		/** @type {Set<string> | boolean} */
+		/** @type {Set<string> | boolean | undefined} */
 		this.usedByExports = undefined;
 	}
 
@@ -68,7 +68,7 @@ class URLDependency extends ModuleDependency {
 
 	/**
 	 * @param {string} context context directory
-	 * @returns {Module} a module
+	 * @returns {Module | null} a module
 	 */
 	createIgnoredModule(context) {
 		const RawDataUrlModule = getRawDataUrlModule();

lib/dependencies/WebAssemblyImportDependency.js

@@ -55,7 +55,7 @@ class WebAssemblyImportDependency extends ModuleDependency {
 	/**
 	 * Returns errors
 	 * @param {ModuleGraph} moduleGraph module graph
-	 * @returns {WebpackError[]} errors
+	 * @returns {WebpackError[] | null | undefined} errors
 	 */
 	getErrors(moduleGraph) {
 		const module = moduleGraph.getModule(this);

lib/dependencies/WorkerPlugin.js

@@ -33,12 +33,17 @@ const WorkerDependency = require("./WorkerDependency");
 /** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
 /** @typedef {import("../Compiler")} Compiler */
 /** @typedef {import("../Entrypoint").EntryOptions} EntryOptions */
+/** @typedef {import("../NormalModule")} NormalModule */
 /** @typedef {import("../Parser").ParserState} ParserState */
 /** @typedef {import("../javascript/BasicEvaluatedExpression")} BasicEvaluatedExpression */
 /** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
 /** @typedef {import("../javascript/JavascriptParser")} Parser */
 /** @typedef {import("./HarmonyImportDependencyParserPlugin").HarmonySettings} HarmonySettings */
 
+/**
+ * @param {NormalModule} module module
+ * @returns {string} url
+ */
 const getUrl = module => {
 	return pathToFileURL(module.resource).toString();
 };
@@ -99,7 +104,7 @@ class WorkerPlugin {
 				/**
 				 * @param {JavascriptParser} parser the parser
 				 * @param {Expression} expr expression
-				 * @returns {[BasicEvaluatedExpression, [number, number]]} parsed
+				 * @returns {[BasicEvaluatedExpression, [number, number]] | void} parsed
 				 */
 				const parseModuleUrl = (parser, expr) => {
 					if (
@@ -382,6 +387,9 @@ class WorkerPlugin {
 
 						return true;
 					};
+					/**
+					 * @param {string} item item
+					 */
 					const processItem = item => {
 						if (
 							item.startsWith("*") &&

lib/optimize/InnerGraph.js

@@ -309,7 +309,7 @@ exports.isDependencyUsedByExports = (
 
 /**
  * @param {Dependency} dependency the dependency
- * @param {Set<string> | boolean} usedByExports usedByExports info
+ * @param {Set<string> | boolean | undefined} usedByExports usedByExports info
  * @param {ModuleGraph} moduleGraph moduleGraph
  * @returns {null | false | function(ModuleGraphConnection, RuntimeSpec): ConnectionState} function to determine if the connection is active
  */

tsconfig.json

@@ -6,7 +6,7 @@
     "allowJs": true,
     "checkJs": true,
     "noEmit": true,
-    "strict": false,
+    "strict": true,
     "noImplicitThis": true,
     "alwaysStrict": true,
     "types": ["node"],

types.d.ts

@@ -2948,10 +2948,10 @@ declare class Dependency {
 	get category(): string;
 	loc: DependencyLocation;
 	setLoc(
-		startLine?: any,
-		startColumn?: any,
-		endLine?: any,
-		endColumn?: any
+		startLine: number,
+		startColumn: number,
+		endLine: number,
+		endColumn: number
 	): void;
 	getContext(): undefined | string;
 	getResourceIdentifier(): null | string;
@@ -2984,12 +2984,12 @@ declare class Dependency {
 	/**
 	 * Returns warnings
 	 */
-	getWarnings(moduleGraph: ModuleGraph): WebpackError[];
+	getWarnings(moduleGraph: ModuleGraph): undefined | null | WebpackError[];
 
 	/**
 	 * Returns errors
 	 */
-	getErrors(moduleGraph: ModuleGraph): WebpackError[];
+	getErrors(moduleGraph: ModuleGraph): undefined | null | WebpackError[];
 
 	/**
 	 * Update the hash
@@ -3003,7 +3003,7 @@ declare class Dependency {
 	getModuleEvaluationSideEffectsState(
 		moduleGraph: ModuleGraph
 	): ConnectionState;
-	createIgnoredModule(context: string): Module;
+	createIgnoredModule(context: string): null | Module;
 	serialize(__0: ObjectSerializerContext): void;
 	deserialize(__0: ObjectDeserializerContext): void;
 	module: any;
@@ -7540,7 +7540,7 @@ declare class Module extends DependenciesBlock {
 	get moduleArgument(): string;
 	getExportsType(
 		moduleGraph: ModuleGraph,
-		strict: boolean
+		strict?: boolean
 	): "namespace" | "default-only" | "default-with-named" | "dynamic";
 	addPresentationalDependency(presentationalDependency: Dependency): void;
 	addCodeGenerationDependency(codeGenerationDependency: Dependency): void;
@@ -11369,7 +11369,7 @@ declare abstract class RuntimeTemplate {
 		/**
 		 * the module
 		 */
-		module: Module;
+		module: null | Module;
 		/**
 		 * the chunk graph
 		 */
@@ -11391,7 +11391,7 @@ declare abstract class RuntimeTemplate {
 		/**
 		 * the module
 		 */
-		module: Module;
+		module: null | Module;
 		/**
 		 * the chunk graph
 		 */
@@ -13781,7 +13781,7 @@ declare namespace exports {
 			) => boolean;
 			export let getDependencyUsedByExportsCondition: (
 				dependency: Dependency,
-				usedByExports: boolean | Set<string>,
+				usedByExports: undefined | boolean | Set<string>,
 				moduleGraph: ModuleGraph
 			) =>
 				| null