refactor: improve code

bin/webpack.js

@@ -80,8 +80,8 @@ const runCli = cli => {
 
 	if (pkg.type === "module" || /\.mjs/i.test(pkg.bin[cli.binName])) {
 		import(path.resolve(path.dirname(pkgPath), pkg.bin[cli.binName])).catch(
-			error => {
+			err => {
-				console.error(error);
+				console.error(err);
 				process.exitCode = 1;
 			}
 		);
@@ -177,8 +177,8 @@ if (!cli.installed) {
 			.then(() => {
 				runCli(cli);
 			})
-			.catch(error => {
+			.catch(err => {
-				console.error(error);
+				console.error(err);
 				process.exitCode = 1;
 			});
 	});

eslint.config.js

@@ -6,6 +6,7 @@ const jsdoc = require("eslint-plugin-jsdoc");
 const prettierConfig = require("eslint-config-prettier");
 const globals = require("globals");
 const stylistic = require("@stylistic/eslint-plugin");
+const unicorn = require("eslint-plugin-unicorn");
 
 const nodeConfig = n.configs["flat/recommended"];
 const jsdocConfig = jsdoc.configs["flat/recommended-typescript-flavor-error"];
@@ -78,7 +79,7 @@ module.exports = [
 					varsIgnorePattern: "^_",
 					args: "none",
 					argsIgnorePattern: "^_",
-					caughtErrors: "none",
+					caughtErrors: "all",
 					caughtErrorsIgnorePattern: "^_",
 					ignoreRestSiblings: true
 				}
@@ -197,9 +198,42 @@ module.exports = [
 			"prefer-spread": "error",
 			"no-sequences": "error",
 			// TODO Enable
+			"id-length": "off",
 			"prefer-destructuring": "off"
 		}
 	},
+	{
+		plugins: {
+			unicorn
+		},
+		rules: {
+			"unicorn/catch-error-name": [
+				"error",
+				{ name: "err", ignore: [/(^_|[0-9]+$)/i] }
+			],
+			// TODO Enable
+			"unicorn/prefer-spread": "off",
+			"unicorn/prefer-string-slice": "off",
+			"unicorn/explicit-length-check": "off",
+			"unicorn/no-lonely-if": "off",
+			"unicorn/prefer-ternary": "off",
+			"unicorn/no-useless-undefined": "off",
+			"unicorn/no-hex-escape": "off",
+			"unicorn/escape-case": "off",
+			"unicorn/prefer-negative-index": "off",
+			"unicorn/no-array-for-each": "off",
+			"unicorn/prefer-number-properties": "off",
+			"unicorn/prefer-default-parameters": "off",
+			"unicorn/prefer-regexp-test": "off",
+			"unicorn/prefer-includes": "off",
+			"unicorn/prefer-math-trunc": "off",
+			"unicorn/prefer-array-find": "off",
+			"unicorn/prefer-native-coercion-functions": "off",
+			"unicorn/no-useless-switch-case": "off",
+			"unicorn/prefer-string-starts-ends-with": "off",
+			"unicorn/no-zero-fractions": "off"
+		}
+	},
 	{
 		plugins: {
 			"@stylistic": stylistic

lib/Compilation.js

@@ -483,8 +483,8 @@ class Compilation {
 							fn: (assets, callback) => {
 								try {
 									fn(assets);
-								} catch (e) {
+								} catch (err) {
-									return callback(e);
+									return callback(err);
 								}
 								if (processedAssets !== undefined)
 									processedAssets.add(this.assets);
@@ -1644,8 +1644,8 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 						});
 						return;
 					}
-				} catch (e) {
+				} catch (err) {
-					console.error(e);
+					console.error(err);
 				}
 			}
 			processDependencyForResolving(dep);
@@ -1737,8 +1737,8 @@ BREAKING CHANGE: Asset processing hooks in Compilation has been merged into a si
 					for (const b of block.blocks) queue.push(b);
 				}
 			} while (queue.length !== 0);
-		} catch (e) {
+		} catch (err) {
-			return callback(e);
+			return callback(err);
 		}
 
 		if (--inProgressSorting === 0) onDependenciesSorted();
@@ -5240,14 +5240,14 @@ This prevents using hashes of each other and should be avoided.`);
 											);
 											moduleObject.loaded = true;
 											return moduleObject.exports;
-										} catch (e) {
+										} catch (execErr) {
 											if (strictModuleExceptionHandling) {
 												if (id) delete moduleCache[id];
 											} else if (strictModuleErrorHandling) {
-												moduleObject.error = e;
+												moduleObject.error = execErr;
 											}
-											if (!e.module) e.module = module;
+											if (!execErr.module) execErr.module = module;
-											throw e;
+											throw execErr;
 										}
 									};
 
@@ -5260,14 +5260,14 @@ This prevents using hashes of each other and should be avoided.`);
 										);
 									}
 									exports = __webpack_require__(module.identifier());
-								} catch (e) {
+								} catch (execErr) {
 									const err = new WebpackError(
 										`Execution of module code from module graph (${module.readableIdentifier(
 											this.requestShortener
-										)}) failed: ${e.message}`
+										)}) failed: ${execErr.message}`
 									);
-									err.stack = e.stack;
+									err.stack = execErr.stack;
-									err.module = e.module;
+									err.module = execErr.module;
 									return callback(err);
 								}
 

lib/Compiler.js

@@ -619,11 +619,11 @@ class Compiler {
 		const finalCallback = (err, entries, compilation) => {
 			try {
 				callback(err, entries, compilation);
-			} catch (e) {
+			} catch (runAsChildErr) {
 				const err = new WebpackError(
-					`compiler.runAsChild callback error: ${e}`
+					`compiler.runAsChild callback error: ${runAsChildErr}`
 				);
-				err.details = /** @type {Error} */ (e).stack;
+				err.details = /** @type {Error} */ (runAsChildErr).stack;
 				/** @type {Compilation} */
 				(this.parentCompilation).errors.push(err);
 			}
@@ -1137,10 +1137,10 @@ ${other}`);
 						this.records = parseJson(
 							/** @type {Buffer} */ (content).toString("utf-8")
 						);
-					} catch (e) {
+					} catch (parseErr) {
 						return callback(
 							new Error(
-								`Cannot parse records: ${/** @type {Error} */ (e).message}`
+								`Cannot parse records: ${/** @type {Error} */ (parseErr).message}`
 							)
 						);
 					}

lib/DllReferencePlugin.js

@@ -75,7 +75,7 @@ class DllReferencePlugin {
 								data.data = parseJson(
 									/** @type {Buffer} */ (result).toString("utf-8")
 								);
-							} catch (e) {
+							} catch (parseErr) {
 								// Store the error in the params so that it can
 								// be added as a compilation error later on.
 								const manifestPath = makePathsRelative(
@@ -83,7 +83,10 @@ class DllReferencePlugin {
 									manifest,
 									compiler.root
 								);
-								data.error = new DllManifestError(manifestPath, e.message);
+								data.error = new DllManifestError(
+									manifestPath,
+									parseErr.message
+								);
 							}
 							this._compilationData.set(params, data);
 							return callback();

lib/FileSystemInfo.js

@@ -1770,7 +1770,7 @@ class FileSystemInfo {
 													expected: imp.d > -1 ? false : undefined,
 													issuer: job
 												});
-											} catch (e) {
+											} catch (err1) {
 												this.logger.warn(
 													`Parsing of ${path} for build dependencies failed at 'import(${source.substring(
 														imp.s,
@@ -1779,15 +1779,15 @@ class FileSystemInfo {
 														"Build dependencies behind this expression are ignored and might cause incorrect cache invalidation."
 												);
 												this.logger.debug(pathToString(job));
-												this.logger.debug(e.stack);
+												this.logger.debug(err1.stack);
 											}
 										}
-									} catch (e) {
+									} catch (err2) {
 										this.logger.warn(
 											`Parsing of ${path} for build dependencies failed and all dependencies of this file are ignored, which might cause incorrect cache invalidation..`
 										);
 										this.logger.debug(pathToString(job));
-										this.logger.debug(e.stack);
+										this.logger.debug(err2.stack);
 									}
 									process.nextTick(callback);
 								});
@@ -1830,8 +1830,8 @@ class FileSystemInfo {
 							let packageData;
 							try {
 								packageData = JSON.parse(content.toString("utf-8"));
-							} catch (e) {
+							} catch (parseErr) {
-								return callback(e);
+								return callback(parseErr);
 							}
 							const depsObject = packageData.dependencies;
 							const optionalDepsObject = packageData.optionalDependencies;
@@ -3616,8 +3616,8 @@ class FileSystemInfo {
 				let data;
 				try {
 					data = JSON.parse(/** @type {Buffer} */ (content).toString("utf-8"));
-				} catch (e) {
+				} catch (parseErr) {
-					return callback(e);
+					return callback(parseErr);
 				}
 				if (!data.name) {
 					/** @type {Logger} */

lib/NormalModule.js

@@ -615,8 +615,8 @@ class NormalModule extends Module {
 					if (options.startsWith("{") && options.endsWith("}")) {
 						try {
 							options = parseJson(options);
-						} catch (e) {
+						} catch (err) {
-							throw new Error(`Cannot parse string options: ${e.message}`);
+							throw new Error(`Cannot parse string options: ${err.message}`);
 						}
 					} else {
 						options = querystring.parse(options, "&", "=", {
@@ -1161,7 +1161,7 @@ class NormalModule extends Module {
 										: deps
 									).add(absolute);
 								}
-							} catch (e) {
+							} catch (_err) {
 								// ignore
 							}
 						}
@@ -1237,8 +1237,8 @@ class NormalModule extends Module {
 					compilation,
 					options
 				});
-			} catch (e) {
+			} catch (parseErr) {
-				handleParseError(/** @type {Error} */ (e));
+				handleParseError(/** @type {Error} */ (parseErr));
 				return;
 			}
 			handleParseResult();

lib/NormalModuleFactory.js

@@ -535,8 +535,8 @@ class NormalModuleFactory extends ModuleFactory {
 								item.ident = ident;
 							}
 						}
-					} catch (e) {
+					} catch (identErr) {
-						return callback(/** @type {Error} */ (e));
+						return callback(/** @type {Error} */ (identErr));
 					}
 
 					if (!resourceData) {
@@ -685,8 +685,8 @@ class NormalModuleFactory extends ModuleFactory {
 								generatorOptions: settings.generator,
 								resolveOptions
 							});
-						} catch (e) {
+						} catch (createDataErr) {
-							return callback(/** @type {Error} */ (e));
+							return callback(/** @type {Error} */ (createDataErr));
 						}
 						callback();
 					});

lib/RuntimeModule.js

@@ -159,7 +159,7 @@ class RuntimeModule extends Module {
 		try {
 			const source = this.getGeneratedCode();
 			return source ? source.length : 0;
-		} catch (e) {
+		} catch (_err) {
 			return 0;
 		}
 	}

lib/asset/AssetModulesPlugin.js

@@ -207,10 +207,10 @@ class AssetModulesPlugin {
 										module.buildInfo.fullContentHash ||
 										codeGenResult.data.get("fullContentHash")
 								});
-							} catch (e) {
+							} catch (err) {
-								/** @type {Error} */ (e).message +=
+								/** @type {Error} */ (err).message +=
 									`\nduring rendering of asset ${module.identifier()}`;
-								throw e;
+								throw err;
 							}
 						}
 					}

lib/cache/PackFileCacheStrategy.js

@@ -676,16 +676,16 @@ class PackContentItems {
 							logger.log(`Serialization of '${key}': ${duration} ms`);
 						else logger.debug(`Serialization of '${key}': ${duration} ms`);
 					}
-				} catch (e) {
+				} catch (err) {
 					rollback(s);
-					if (e === NOT_SERIALIZABLE) continue;
+					if (err === NOT_SERIALIZABLE) continue;
 					const msg = "Skipped not serializable cache item";
-					if (e.message.includes("ModuleBuildError")) {
+					if (err.message.includes("ModuleBuildError")) {
-						logger.log(`${msg} (in build error): ${e.message}`);
+						logger.log(`${msg} (in build error): ${err.message}`);
-						logger.debug(`${msg} '${key}' (in build error): ${e.stack}`);
+						logger.debug(`${msg} '${key}' (in build error): ${err.stack}`);
 					} else {
-						logger.warn(`${msg}: ${e.message}`);
+						logger.warn(`${msg}: ${err.message}`);
-						logger.debug(`${msg} '${key}': ${e.stack}`);
+						logger.debug(`${msg} '${key}': ${err.stack}`);
 					}
 				}
 			}
@@ -697,7 +697,7 @@ class PackContentItems {
 		try {
 			write(true);
 			write(this.map);
-		} catch (e) {
+		} catch (_err) {
 			rollback(s);
 
 			// Try to serialize each item on it's own
@@ -707,13 +707,13 @@ class PackContentItems {
 				try {
 					write(key);
 					write(value);
-				} catch (e) {
+				} catch (err) {
 					rollback(s);
-					if (e === NOT_SERIALIZABLE) continue;
+					if (err === NOT_SERIALIZABLE) continue;
 					logger.warn(
-						`Skipped not serializable cache item '${key}': ${e.message}`
+						`Skipped not serializable cache item '${key}': ${err.message}`
 					);
-					logger.debug(e.stack);
+					logger.debug(err.stack);
 				}
 			}
 			write(null);

lib/config/defaults.js

@@ -411,7 +411,7 @@ const applyCacheDefaults = (
 					try {
 						if (fs.statSync(path.join(dir, "package.json")).isFile()) break;
 						// eslint-disable-next-line no-empty
-					} catch (e) {}
+					} catch (_err) {}
 					const parent = path.dirname(dir);
 					if (dir === parent) {
 						dir = undefined;
@@ -908,12 +908,12 @@ const applyOutputDefaults = (
 		try {
 			const packageInfo = JSON.parse(fs.readFileSync(pkgPath, "utf-8"));
 			return packageInfo.name || "";
-		} catch (e) {
+		} catch (err) {
-			if (/** @type {Error & { code: string }} */ (e).code !== "ENOENT") {
+			if (/** @type {Error & { code: string }} */ (err).code !== "ENOENT") {
 				/** @type {Error & { code: string }} */
-				(e).message +=
+				(err).message +=
 					`\nwhile determining default 'output.uniqueName' from 'name' in ${pkgPath}`;
-				throw e;
+				throw err;
 			}
 			return "";
 		}

lib/css/CssModulesPlugin.js

@@ -758,10 +758,10 @@ class CssModulesPlugin {
 					module
 				});
 				source.add(moduleSource);
-			} catch (e) {
+			} catch (err) {
 				/** @type {Error} */
-				(e).message += `\nduring rendering of css ${module.identifier()}`;
+				(err).message += `\nduring rendering of css ${module.identifier()}`;
-				throw e;
+				throw err;
 			}
 		}
 		const metaDataStr = metaData.join(",");

lib/css/CssParser.js

@@ -73,7 +73,7 @@ const normalizeUrl = (str, isString) => {
 		// Convert `url('%2E/img.png')` -> `url('./img.png')`
 		try {
 			str = decodeURIComponent(str);
-		} catch (error) {
+		} catch (_err) {
 			// Ignore
 		}
 	}

lib/debug/ProfilingPlugin.js

@@ -41,7 +41,7 @@ let inspector;
 try {
 	// eslint-disable-next-line n/no-unsupported-features/node-builtins
 	inspector = require("inspector");
-} catch (e) {
+} catch (_err) {
 	console.log("Unable to CPU profile in < node 8.0");
 }
 
@@ -474,13 +474,13 @@ const makeNewProfiledTapFn = (hookName, tracer, { name, type, fn }) => {
 				let r;
 				try {
 					r = fn(...args);
-				} catch (error) {
+				} catch (err) {
 					tracer.trace.end({
 						name,
 						id,
 						cat: defaultCategory
 					});
-					throw error;
+					throw err;
 				}
 				tracer.trace.end({
 					name,

lib/hmr/JavascriptHotModuleReplacement.runtime.js

@@ -376,17 +376,17 @@ module.exports = function () {
 									moduleId: moduleId,
 									module: $moduleCache$[moduleId]
 								});
-							} catch (err2) {
+							} catch (err1) {
 								if (options.onErrored) {
 									options.onErrored({
 										type: "self-accept-error-handler-errored",
 										moduleId: moduleId,
-										error: err2,
+										error: err1,
 										originalError: err
 									});
 								}
 								if (!options.ignoreErrored) {
-									reportError(err2);
+									reportError(err1);
 									reportError(err);
 								}
 							}

lib/javascript/JavascriptModulesPlugin.js

@@ -448,12 +448,12 @@ class JavascriptModulesPlugin {
 							moduleObject.exports,
 							context.__webpack_require__
 						);
-					} catch (e) {
+					} catch (err) {
-						e.stack += printGeneratedCodeForStack(
+						err.stack += printGeneratedCodeForStack(
 							options.module,
 							/** @type {string} */ (code)
 						);
-						throw e;
+						throw err;
 					}
 				});
 				compilation.hooks.executeModule.tap(PLUGIN_NAME, (options, context) => {
@@ -472,9 +472,9 @@ class JavascriptModulesPlugin {
 					try {
 						// eslint-disable-next-line no-useless-call
 						fn.call(null, context.__webpack_require__);
-					} catch (e) {
+					} catch (err) {
-						e.stack += printGeneratedCodeForStack(options.module, code);
+						err.stack += printGeneratedCodeForStack(options.module, code);
-						throw e;
+						throw err;
 					}
 				});
 			}
@@ -603,9 +603,9 @@ class JavascriptModulesPlugin {
 					),
 				"JavascriptModulesPlugin.getCompilationHooks().renderModulePackage"
 			);
-		} catch (e) {
+		} catch (err) {
-			e.module = module;
+			err.module = module;
-			throw e;
+			throw err;
 		}
 	}
 

lib/javascript/JavascriptParser.js

@@ -4056,8 +4056,8 @@ class JavascriptParser extends Parser {
 					return result;
 				}
 			}
-		} catch (e) {
+		} catch (err) {
-			console.warn(e);
+			console.warn(err);
 			// ignore error
 		}
 		return new BasicEvaluatedExpression()
@@ -4594,9 +4594,9 @@ class JavascriptParser extends Parser {
 						}
 						options[key] = val;
 					}
-				} catch (e) {
+				} catch (err) {
-					const newErr = new Error(String(e.message));
+					const newErr = new Error(String(err.message));
-					newErr.stack = String(e.stack);
+					newErr.stack = String(err.stack);
 					Object.assign(newErr, { comment });
 					errors.push(newErr);
 				}
@@ -4749,8 +4749,8 @@ class JavascriptParser extends Parser {
 		let threw = false;
 		try {
 			ast = /** @type {AnyNode} */ (parser.parse(code, parserOptions));
-		} catch (e) {
+		} catch (err) {
-			error = e;
+			error = err;
 			threw = true;
 		}
 
@@ -4765,7 +4765,7 @@ class JavascriptParser extends Parser {
 			try {
 				ast = /** @type {AnyNode} */ (parser.parse(code, parserOptions));
 				threw = false;
-			} catch (e) {
+			} catch (_err) {
 				// we use the error from first parse try
 				// so nothing to do here
 			}

lib/json/JsonParser.js

@@ -50,8 +50,10 @@ class JsonParser extends Parser {
 				typeof source === "object"
 					? source
 					: parseFn(source[0] === "\ufeff" ? source.slice(1) : source);
-		} catch (e) {
+		} catch (err) {
-			throw new Error(`Cannot parse JSON: ${/** @type {Error} */ (e).message}`);
+			throw new Error(
+				`Cannot parse JSON: ${/** @type {Error} */ (err).message}`
+			);
 		}
 		const jsonData = new JsonData(/** @type {Buffer | RawJsonData} */ (data));
 		const buildInfo = /** @type {BuildInfo} */ (state.module.buildInfo);

lib/optimize/ConcatenatedModule.js

@@ -1488,11 +1488,11 @@ class ConcatenatedModule extends Module {
 					return `/* ${
 						exportInfo.isReexport() ? "reexport" : "binding"
 					} */ ${finalName}`;
-				} catch (e) {
+				} catch (err) {
 					/** @type {Error} */
-					(e).message +=
+					(err).message +=
 						`\nwhile generating the root export '${name}' (used name: '${used}')`;
-					throw e;
+					throw err;
 				}
 			});
 		}

lib/rules/RuleSetCompiler.js

@@ -236,7 +236,7 @@ class RuleSetCompiler {
 					matchWhenEmpty: condition(""),
 					fn: condition
 				};
-			} catch (err) {
+			} catch (_err) {
 				throw this.error(
 					path,
 					condition,

lib/schemes/HttpUriPlugin.js

@@ -938,7 +938,7 @@ Remove this line from the lockfile to force upgrading.`
 													contentWithChangedEol,
 													entry.integrity
 												);
-											} catch (e) {
+											} catch (_err) {
 												// ignore
 											}
 											if (isEolChanged) {

lib/serialization/ObjectMiddleware.js

@@ -383,7 +383,7 @@ class ObjectMiddleware extends SerializerMiddleware {
 						if (request) {
 							return `${request}${name ? `.${name}` : ""}`;
 						}
-					} catch (e) {
+					} catch (_err) {
 						// ignore -> fallback
 					}
 					if (typeof item === "object" && item !== null) {
@@ -406,8 +406,8 @@ class ObjectMiddleware extends SerializerMiddleware {
 					}
 					try {
 						return `${item}`;
-					} catch (e) {
+					} catch (err) {
-						return `(${e.message})`;
+						return `(${err.message})`;
 					}
 				})
 				.join(" -> ");
@@ -417,16 +417,16 @@ class ObjectMiddleware extends SerializerMiddleware {
 			write(value, key) {
 				try {
 					process(value);
-				} catch (e) {
+				} catch (err) {
-					if (e !== NOT_SERIALIZABLE) {
+					if (err !== NOT_SERIALIZABLE) {
 						if (hasDebugInfoAttached === undefined)
 							hasDebugInfoAttached = new WeakSet();
-						if (!hasDebugInfoAttached.has(e)) {
+						if (!hasDebugInfoAttached.has(err)) {
-							e.message += `\nwhile serializing ${stackToString(value)}`;
+							err.message += `\nwhile serializing ${stackToString(value)}`;
-							hasDebugInfoAttached.add(e);
+							hasDebugInfoAttached.add(err);
 						}
 					}
-					throw e;
+					throw err;
 				}
 			},
 			setCircularReference(ref) {
@@ -571,10 +571,10 @@ class ObjectMiddleware extends SerializerMiddleware {
 				process(item);
 			}
 			return result;
-		} catch (e) {
+		} catch (err) {
-			if (e === NOT_SERIALIZABLE) return null;
+			if (err === NOT_SERIALIZABLE) return null;
 
-			throw e;
+			throw err;
 		} finally {
 			// Get rid of these references to avoid leaking memory
 			// This happens because the optimized code v8 generates

lib/sharing/utils.js

@@ -166,7 +166,7 @@ function getCommithash(urlParsed) {
 	try {
 		hash = decodeURIComponent(hash);
 		// eslint-disable-next-line no-empty
-	} catch (e) {}
+	} catch (_err) {}
 
 	if (
 		extractCommithashByDomain[
@@ -236,7 +236,7 @@ function getVersionFromHash(hash) {
 function canBeDecoded(str) {
 	try {
 		decodeURIComponent(str);
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 
@@ -264,7 +264,7 @@ function getGitUrlVersion(gitUrl) {
 	try {
 		parsed = new URL(gitUrl);
 		// eslint-disable-next-line no-empty
-	} catch (e) {}
+	} catch (_err) {}
 
 	if (!parsed) {
 		return "";

lib/util/fs.js

@@ -597,8 +597,8 @@ const readJson = (fs, p, callback) => {
 		let data;
 		try {
 			data = JSON.parse(/** @type {Buffer} */ (buf).toString("utf-8"));
-		} catch (e) {
+		} catch (err1) {
-			return callback(/** @type {Error} */ (e));
+			return callback(/** @type {Error} */ (err1));
 		}
 		return callback(null, data);
 	});

lib/wasm-async/AsyncWebAssemblyModulesPlugin.js

@@ -208,9 +208,9 @@ class AsyncWebAssemblyModulesPlugin {
 					hooks.renderModuleContent.call(moduleSource, module, renderContext),
 				"AsyncWebAssemblyModulesPlugin.getCompilationHooks().renderModuleContent"
 			);
-		} catch (e) {
+		} catch (err) {
-			/** @type {WebpackError} */ (e).module = module;
+			/** @type {WebpackError} */ (err).module = module;
-			throw e;
+			throw err;
 		}
 	}
 }

package.json

@@ -62,6 +62,7 @@
     "eslint-plugin-jsdoc": "^48.10.1",
     "eslint-plugin-n": "^17.8.1",
     "eslint-plugin-prettier": "^5.1.3",
+    "eslint-plugin-unicorn": "^55.0.0",
     "file-loader": "^6.0.0",
     "fork-ts-checker-webpack-plugin": "^9.0.2",
     "globals": "^15.4.0",

setup/setup.js

@@ -21,8 +21,8 @@ function setup() {
 		.then(() => {
 			process.exitCode = 0;
 		})
-		.catch(e => {
+		.catch(err => {
-			console.error(e);
+			console.error(err);
 			process.exitCode = 1;
 		});
 }
@@ -54,7 +54,7 @@ async function ensureYarnInstalledAsync() {
 	try {
 		const stdout = await execGetOutput("yarn", ["-v"], "Check yarn version");
 		hasYarn = semverPattern.test(stdout);
-	} catch (e) {
+	} catch (_err) {
 		hasYarn = false;
 	}
 	if (!hasYarn) await installYarnAsync();

test/BannerPlugin.test.js

@@ -16,7 +16,7 @@ it("should cache assets", done => {
 		fs.mkdirSync(path.join(pluginDir), {
 			recursive: true
 		});
-	} catch (e) {
+	} catch (_err) {
 		// empty
 	}
 	const compiler = webpack({
@@ -53,7 +53,7 @@ it("can place banner as footer", done => {
 		fs.mkdirSync(path.join(pluginDir), {
 			recursive: true
 		});
-	} catch (e) {
+	} catch (_err) {
 		// empty
 	}
 	const compiler = webpack({
@@ -87,7 +87,7 @@ it("should allow to change stage", done => {
 		fs.mkdirSync(path.join(pluginDir), {
 			recursive: true
 		});
-	} catch (e) {
+	} catch (_err) {
 		// empty
 	}
 	const compiler = webpack({

test/BenchmarkTestCases.benchmark.js

@@ -20,10 +20,10 @@ describe("BenchmarkTestCases", function () {
 
 	try {
 		fs.mkdirSync(path.join(__dirname, "js"));
-	} catch (e) {} // eslint-disable-line no-empty
+	} catch (_err) {} // eslint-disable-line no-empty
 	try {
 		fs.mkdirSync(baselinesPath);
-	} catch (e) {} // eslint-disable-line no-empty
+	} catch (_err) {} // eslint-disable-line no-empty
 
 	beforeAll(function (done) {
 		const git = require("simple-git");
@@ -40,7 +40,7 @@ describe("BenchmarkTestCases", function () {
 					} else {
 						try {
 							fs.mkdirSync(baselinePath);
-						} catch (e) {} // eslint-disable-line no-empty
+						} catch (_err) {} // eslint-disable-line no-empty
 						const gitIndex = path.resolve(rootPath, ".git/index");
 						const index = fs.readFileSync(gitIndex);
 						git(rootPath).raw(

test/ConfigTestCases.template.js

@@ -154,7 +154,7 @@ const describeCases = config => {
 									testConfig,
 									require(path.join(testDirectory, "test.config.js"))
 								);
-							} catch (e) {
+							} catch (_err) {
 								// ignored
 							}
 							if (testConfig.timeout) setDefaultTimeout(testConfig.timeout);
@@ -712,8 +712,8 @@ const describeCases = config => {
 											});
 										});
 									});
-								} catch (e) {
+								} catch (err) {
-									handleFatalError(e, done);
+									handleFatalError(err, done);
 								}
 							} else {
 								require("..")(options, onCompiled);

test/HotModuleReplacementPlugin.test.js

@@ -36,12 +36,12 @@ describe("HotModuleReplacementPlugin", () => {
 			fs.mkdirSync(path.join(__dirname, "js", "HotModuleReplacementPlugin"), {
 				recursive: true
 			});
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		try {
 			fs.unlinkSync(recordsFile);
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		const compiler = webpack({
@@ -107,7 +107,7 @@ describe("HotModuleReplacementPlugin", () => {
 		let firstUpdate;
 		try {
 			fs.mkdirSync(outputPath, { recursive: true });
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		fs.writeFileSync(entryFile, `${++step}`, "utf-8");
@@ -116,7 +116,7 @@ describe("HotModuleReplacementPlugin", () => {
 			try {
 				fs.statSync(path.join(outputPath, file));
 				return true;
-			} catch (err) {
+			} catch (_err) {
 				return false;
 			}
 		};
@@ -188,12 +188,12 @@ describe("HotModuleReplacementPlugin", () => {
 		const recordsFile = path.join(outputPath, "records.json");
 		try {
 			fs.mkdirSync(outputPath, { recursive: true });
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		try {
 			fs.unlinkSync(recordsFile);
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		const compiler = webpack({
@@ -271,12 +271,12 @@ describe("HotModuleReplacementPlugin", () => {
 					recursive: true
 				}
 			);
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		try {
 			fs.unlinkSync(recordsFile);
-		} catch (e) {
+		} catch (_err) {
 			// empty
 		}
 		const compiler = webpack({

test/JavascriptParser.unittest.js

@@ -155,7 +155,7 @@ describe("JavascriptParser", () => {
 						fgh.sub;
 						fgh;
 					}
-				} catch (e) {
+				} catch (err) {
 					fgh.sub;
 					fgh;
 				}

test/MemoryLimitTestCases.test.js

@@ -51,7 +51,7 @@ describe("MemoryLimitTestCases", () => {
 				testConfig,
 				require(path.join(base, testName, "test.config.js"))
 			);
-		} catch (e) {
+		} catch (_err) {
 			// ignored
 		}
 		it(`should build ${JSON.stringify(testName)} with heap limit of ${toMiB(

test/MultiCompiler.test.js

@@ -451,9 +451,9 @@ describe("MultiCompiler", function () {
 					setTimeout(() => {
 						compiler.close(done);
 					}, 1000);
-				} catch (e) {
+				} catch (err) {
-					console.error(e);
+					console.error(err);
-					done(e);
+					done(err);
 				}
 			});
 		});
@@ -530,9 +530,9 @@ describe("MultiCompiler", function () {
 					setTimeout(() => {
 						compiler.close(done);
 					}, 1000);
-				} catch (e) {
+				} catch (err) {
-					console.error(e);
+					console.error(err);
-					done(e);
+					done(err);
 				}
 			});
 		});

test/MultiStats.test.js

@@ -27,8 +27,8 @@ describe("MultiStats", () => {
 				);
 				expect(statsObject.children).toHaveLength(2);
 				done();
-			} catch (e) {
+			} catch (err) {
-				done(e);
+				done(err);
 			}
 		});
 	});

test/StatsTestCases.basictest.js

@@ -65,7 +65,7 @@ describe("StatsTestCases", () => {
 					testConfig,
 					require(path.join(base, testName, "test.config.js"))
 				);
-			} catch (e) {
+			} catch (_err) {
 				// ignored
 			}
 

test/TestCases.template.js

@@ -447,10 +447,10 @@ const describeCases = config => {
 													}
 												});
 												cleanups.push(() => (esmContext.it = undefined));
-											} catch (e) {
+											} catch (err) {
-												console.log(e);
+												console.log(err);
-												e.message += `\nwhile parsing ${p}`;
+												err.message += `\nwhile parsing ${p}`;
-												throw e;
+												throw err;
 											}
 											if (esmMode === "unlinked") return esm;
 											return (async () => {

test/WatchDetection.test.js

@@ -41,7 +41,7 @@ describe("WatchDetection", () => {
 			beforeAll(() => {
 				try {
 					fs.mkdirSync(fixturePath);
-				} catch (e) {
+				} catch (_err) {
 					// empty
 				}
 				fs.writeFileSync(filePath, "require('./file2')", "utf-8");
@@ -52,17 +52,17 @@ describe("WatchDetection", () => {
 				setTimeout(() => {
 					try {
 						fs.unlinkSync(filePath);
-					} catch (e) {
+					} catch (_err) {
 						// empty
 					}
 					try {
 						fs.unlinkSync(file2Path);
-					} catch (e) {
+					} catch (_err) {
 						// empty
 					}
 					try {
 						fs.rmdirSync(fixturePath);
-					} catch (e) {
+					} catch (_err) {
 						// empty
 					}
 					done();

test/WatchSuspend.test.js

@@ -32,14 +32,14 @@ describe("WatchSuspend", () => {
 		beforeAll(() => {
 			try {
 				fs.mkdirSync(fixturePath);
-			} catch (e) {
+			} catch (_err) {
 				// skip
 			}
 			try {
 				fs.writeFileSync(filePath, "'foo'", "utf-8");
 				fs.writeFileSync(file2Path, "'file2'", "utf-8");
 				fs.writeFileSync(file3Path, "'file3'", "utf-8");
-			} catch (e) {
+			} catch (_err) {
 				// skip
 			}
 			const webpack = require("../");
@@ -63,12 +63,12 @@ describe("WatchSuspend", () => {
 			compiler = null;
 			try {
 				fs.unlinkSync(filePath);
-			} catch (e) {
+			} catch (_err) {
 				// skip
 			}
 			try {
 				fs.rmdirSync(fixturePath);
-			} catch (e) {
+			} catch (_err) {
 				// skip
 			}
 		});

test/WatchTestCases.template.js

@@ -335,7 +335,7 @@ const describeCases = config => {
 											testConfig = require(
 												path.join(testDirectory, "test.config.js")
 											);
-										} catch (e) {
+										} catch (_err) {
 											// empty
 										}
 

test/configCases/asset-modules/http-url/test.config.js

@@ -5,14 +5,14 @@ module.exports = {
 	beforeExecute() {
 		try {
 			fs.unlinkSync(path.join(__dirname, "dev-defaults.webpack.lock"));
-		} catch (e) {
+		} catch (_err) {
 			// Empty
 		}
 	},
 	afterExecute() {
 		try {
 			fs.unlinkSync(path.join(__dirname, "dev-defaults.webpack.lock"));
-		} catch (e) {
+		} catch (_err) {
 			// Empty
 		}
 	}

test/configCases/clean/link/test.filter.js

@@ -10,7 +10,7 @@ module.exports = () => {
 		);
 		fs.unlinkSync(path.join(__dirname, ".testlink"));
 		return true;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/configCases/loader-import-module/css/webpack.config.js

@@ -60,9 +60,9 @@ module.exports = {
 					expect(auxiliaryFiles).toContain("assets/file.png");
 					expect(auxiliaryFiles).toContain("assets/file.png?1");
 					expect(auxiliaryFiles).toContain("assets/file.jpg");
-				} catch (e) {
+				} catch (err) {
 					console.log(stats.toString({ colors: true, orphanModules: true }));
-					throw e;
+					throw err;
 				}
 			})
 	]

test/configCases/source-map/no-source-map/webpack.config.js

@@ -5,9 +5,9 @@ const plugins = [
 				const result = asset.source.sourceAndMap();
 				try {
 					expect(result.map).toBe(null);
-				} catch (e) {
+				} catch (err) {
-					e.message += `\nfor asset ${asset.name}`;
+					err.message += `\nfor asset ${asset.name}`;
-					throw e;
+					throw err;
 				}
 			}
 		});

test/helpers/createLazyTestEnv.js

@@ -60,10 +60,10 @@ module.exports = (globalTimeout = 2000, nameSuffix = "") => {
 		state.hasStarted = false;
 		try {
 			fn();
-		} catch (e) {
+		} catch (err) {
 			// avoid leaking memory
-			e.stack;
+			err.stack;
-			throw e;
+			throw err;
 		}
 		state.currentDescribeBlock = oldCurrentDescribeBlock;
 		state.currentlyRunningTest = oldCurrentlyRunningTest;

test/helpers/supportDefaultAssignment.js

@@ -4,7 +4,7 @@ module.exports = function supportDefaultAssignment() {
 		var E = eval("class E { toString() { return 'default' } }");
 		var f1 = eval("(function f1({a, b = E}) {return new b().toString();})");
 		return f1({ a: "test" }) === "default";
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsArrowFunctionExpression.js

@@ -4,7 +4,7 @@ module.exports = function supportArrowFunctionExpression() {
 			"var foo = function(fn) {return fn.toString()}; foo(() => {return 'a'})"
 		);
 		return true;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsBlockScoping.js

@@ -4,7 +4,7 @@ module.exports = function supportsBlockScoping() {
 			"(function f() { const x = 1; if (true) { const x = 2; } return x; })"
 		);
 		return f() === 1;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsClassFields.js

@@ -2,7 +2,7 @@ module.exports = function supportsES6() {
 	try {
 		eval("class A { #field = 1 }");
 		return true;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsClassStaticBlock.js

@@ -2,7 +2,7 @@ module.exports = function supportsClassStaticBLock() {
 	try {
 		eval("(function f({x, y}) { class Foo { static {} } })");
 		return true;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsDefaultArgs.js

@@ -2,7 +2,7 @@ module.exports = function supportsDefaultArgs() {
 	try {
 		var f = eval("(function f(a = 123) { return a; })");
 		return f() === 123;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsES6.js

@@ -2,7 +2,7 @@ module.exports = function supportsES6() {
 	try {
 		eval("class A {}");
 		return true;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsForOf.js

@@ -2,7 +2,7 @@ module.exports = function supportDefaultAssignment() {
 	try {
 		var f = eval("(function f() { for(var x of ['ok', 'fail']) return x; })");
 		return f() === "ok";
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsIteratorDestructuring.js

@@ -2,7 +2,7 @@ module.exports = function supportsIteratorDestructuring() {
 	try {
 		var f = eval("(function f([, x, ...y]) { return x; })");
 		return f([1, 2]) === 2;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsLogicalAssignment.js

@@ -4,7 +4,7 @@ module.exports = function supportsLogicalAssignment() {
 			"(function f() { var x = null; x ??= true; x &&= true; return x ||= false; })"
 		);
 		return f();
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsNullishCoalescing.js

@@ -2,7 +2,7 @@ module.exports = function supportsNullishCoalescing() {
 	try {
 		var f = eval("(function f() { return null ?? true; })");
 		return f();
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsObjectDestructuring.js

@@ -2,7 +2,7 @@ module.exports = function supportsObjectDestructuring() {
 	try {
 		var f = eval("(function f({x, y}) { return x + y; })");
 		return f({ x: 1, y: 2 }) === 3;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsOptionalCatchBinding.js

@@ -2,7 +2,7 @@ module.exports = function supportsOptionalCatchBinding() {
 	try {
 		eval("try {} catch {}");
 		return true;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsOptionalChaining.js

@@ -2,7 +2,7 @@ module.exports = function supportsOptionalChaining() {
 	try {
 		var f = eval("(function f() { return ({a: true}) ?.a })");
 		return f();
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsSpread.js

@@ -4,7 +4,7 @@ module.exports = function supportsSpread() {
 		var y;
 		eval("y = { ...x }");
 		return y !== x && y.a;
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsTemplateStrings.js

@@ -2,7 +2,7 @@ module.exports = function supportsTemplateStrings() {
 	try {
 		var f = eval("(function f() { return String.raw`a\\b`; })");
 		return f() === "a\\b";
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/supportsWebAssembly.js

@@ -1,7 +1,7 @@
 module.exports = function supportsWebAssembly() {
 	try {
 		return typeof WebAssembly !== "undefined";
-	} catch (e) {
+	} catch (_err) {
 		return false;
 	}
 };

test/helpers/warmup-webpack.js

@@ -17,8 +17,8 @@ describe("warmup", () => {
 				try {
 					expect(err).toBe(END);
 					done();
-				} catch (e) {
+				} catch (doneErr) {
-					done(e);
+					done(doneErr);
 				}
 			}
 		);

test/setupTestFramework.js

@@ -83,17 +83,17 @@ if (process.env.DEBUG_INFO) {
 									process.stdout.write(`DONE OK ${name}\n`);
 									return r;
 								},
-								e => {
+								err => {
 									process.stdout.write(`DONE FAIL ${name}\n`);
-									throw e;
+									throw err;
 								}
 							);
 						}
 
 						process.stdout.write(`DONE OK ${name}\n`);
-					} catch (e) {
+					} catch (err) {
 						process.stdout.write(`DONE FAIL ${name}\n`);
-						throw e;
+						throw err;
 					}
 				},
 				timeout