chore: bump ESLint to 9, with related dependencies

.github/DEVELOPMENT.md

@@ -44,7 +44,6 @@ Each should be shown in VS Code, and can be run manually on the command-line:
 -   `pnpm lint` ([ESLint](https://eslint.org) with [typescript-eslint](https://typescript-eslint.io)): Lints JavaScript and TypeScript source files
 -   `pnpm lint:knip` ([knip](https://github.com/webpro/knip)): Detects unused files, dependencies, and code exports
 -   `pnpm lint:md` ([Markdownlint](https://github.com/DavidAnson/markdownlint)): Checks Markdown source files
--   `pnpm lint:package-json` ([npm-package-json-lint](https://npmpackagejsonlint.org/)): Lints the `package.json` file
 -   `pnpm lint:packages` ([pnpm dedupe --check](https://pnpm.io/cli/dedupe)): Checks for unnecessarily duplicated packages in the `pnpm-lock.yml` file
 -   `pnpm lint:spelling` ([cspell](https://cspell.org)): Spell checks across all source files
 

eslint.config.js

@@ -0,0 +1,107 @@
+const comments = require("@eslint-community/eslint-plugin-eslint-comments/configs");
+const eslint = require("@eslint/js");
+const vitest = require("@vitest/eslint-plugin");
+const eslintPlugin = require("eslint-plugin-eslint-plugin");
+const jsdoc = require("eslint-plugin-jsdoc");
+const jsonc = require("eslint-plugin-jsonc");
+const markdown = require("eslint-plugin-markdown");
+const n = require("eslint-plugin-n");
+const perfectionist = require("eslint-plugin-perfectionist");
+const regexp = require("eslint-plugin-regexp");
+const yml = require("eslint-plugin-yml");
+const tseslint = require("typescript-eslint");
+
+module.exports = tseslint.config(
+	{
+		ignores: [
+			"**/*.snap",
+			"coverage*",
+			"lib",
+			"node_modules",
+			"pnpm-lock.yaml",
+		],
+	},
+	{ linterOptions: { reportUnusedDisableDirectives: "error" } },
+	eslint.configs.recommended,
+	eslintPlugin.configs["flat/recommended"],
+	comments.recommended,
+	jsdoc.configs["flat/contents-typescript-error"],
+	jsdoc.configs["flat/logical-typescript-error"],
+	jsdoc.configs["flat/stylistic-typescript-error"],
+	jsonc.configs["flat/recommended-with-json"],
+	markdown.configs.recommended,
+	n.configs["flat/recommended"],
+	perfectionist.configs["recommended-natural"],
+	regexp.configs["flat/recommended"],
+	{
+		extends: [
+			tseslint.configs.strictTypeChecked,
+			tseslint.configs.stylisticTypeChecked,
+		],
+		files: ["**/*.js", "**/*.ts"],
+		languageOptions: {
+			parserOptions: {
+				projectService: {
+					allowDefaultProject: [
+						"*.config.*s",
+						"bin/*.js",
+						"src/tests/*.js",
+					],
+				},
+				tsconfigRootDir: __dirname,
+			},
+		},
+		rules: {
+			"@typescript-eslint/no-require-imports": "off",
+			"jsdoc/match-description": "off",
+			"n/no-missing-import": "off",
+
+			// Stylistic concerns that don't interfere with Prettier
+			"logical-assignment-operators": [
+				"error",
+				"always",
+				{ enforceForIfStatements: true },
+			],
+			"no-useless-rename": "error",
+			"object-shorthand": "error",
+			"operator-assignment": "error",
+		},
+		settings: {
+			perfectionist: { partitionByComment: true, type: "natural" },
+		},
+	},
+	{
+		extends: [tseslint.configs.disableTypeChecked],
+		files: ["**/*.md/*.js", "**/*.md/*.ts", "eslint.config.js"],
+	},
+	{
+		files: ["**/*.md/*.jsonc"],
+		rules: {
+			"jsonc/comma-dangle": "off",
+			"jsonc/no-comments": "off",
+		},
+	},
+	{
+		extends: [vitest.configs.recommended],
+		files: ["**/*.test.*"],
+		rules: { "@typescript-eslint/no-unsafe-assignment": "off" },
+	},
+	{
+		extends: [
+			yml.configs["flat/recommended"],
+			yml.configs["flat/prettier"],
+		],
+		files: ["**/*.{yml,yaml}"],
+		rules: {
+			"yml/file-extension": ["error", { extension: "yml" }],
+			"yml/sort-keys": [
+				"error",
+				{ order: { type: "asc" }, pathPattern: "^.*$" },
+			],
+			"yml/sort-sequence-values": [
+				"error",
+				{ order: { type: "asc" }, pathPattern: "^.*$" },
+			],
+		},
+	},
+);

knip.jsonc → knip.json

@@ -2,5 +2,5 @@
 	"$schema": "https://unpkg.com/knip@latest/schema.json",
 	"entry": ["src/index.ts!"],
 	"ignoreExportsUsedInFile": { "interface": true, "type": true },
-	"project": ["src/**/*.ts!"],
+	"project": ["src/**/*.ts!"]
 }

package.json

@@ -41,11 +41,10 @@
 	"scripts": {
 		"build": "tsup",
 		"format": "prettier \"**/*\" --ignore-unknown",
-		"lint": "eslint . .*js --max-warnings 0 --report-unused-disable-directives",
+		"lint": "eslint . --max-warnings 0",
 		"lint:eslint-docs": "npm run update:eslint-docs -- --check",
 		"lint:knip": "knip",
 		"lint:md": "markdownlint \"**/*.md\" \".github/**/*.md\"",
-		"lint:package-json": "npmPkgJsonLint ./package.json",
 		"lint:packages": "pnpm dedupe --check",
 		"lint:spelling": "cspell \"**\" \".github/**/*\"",
 		"prepare": "husky",
@@ -68,50 +67,44 @@
 		"validate-npm-package-name": "^6.0.0"
 	},
 	"devDependencies": {
+		"@eslint-community/eslint-plugin-eslint-comments": "^4.4.1",
+		"@eslint/js": "^9.18.0",
 		"@release-it/conventional-changelog": "^10.0.0",
-		"@types/eslint": "^8.56.2",
-		"@types/estree": "^1.0.5",
+		"@types/estree": "^1.0.6",
 		"@types/node": "^22.0.0",
 		"@types/package-json-validator": "^0.6.1",
 		"@types/semver": "^7.5.6",
 		"@types/sort-object-keys": "^1.1.3",
 		"@types/validate-npm-package-name": "^4.0.2",
-		"@typescript-eslint/eslint-plugin": "^7.0.0",
-		"@typescript-eslint/parser": "^8.0.0",
 		"@vitest/coverage-v8": "^1.2.1",
+		"@vitest/eslint-plugin": "^1.1.25",
 		"console-fail-test": "^0.5.0",
 		"cspell": "^8.3.2",
-		"eslint": "^8.56.0",
-		"eslint-doc-generator": "^2.0.0",
-		"eslint-plugin-deprecation": "^3.0.0",
-		"eslint-plugin-eslint-comments": "^3.2.0",
+		"eslint": "^9.18.0",
+		"eslint-doc-generator": "^2.0.2",
 		"eslint-plugin-eslint-plugin": "^6.4.0",
-		"eslint-plugin-jsdoc": "^50.0.0",
-		"eslint-plugin-jsonc": "^2.12.2",
-		"eslint-plugin-markdown": "^3.0.1",
-		"eslint-plugin-n": "^16.6.2",
-		"eslint-plugin-no-only-tests": "^3.1.0",
-		"eslint-plugin-perfectionist": "^2.5.0",
-		"eslint-plugin-regexp": "^2.2.0",
-		"eslint-plugin-vitest": "^0.4.0",
-		"eslint-plugin-yml": "^1.12.2",
+		"eslint-plugin-jsdoc": "^50.6.1",
+		"eslint-plugin-jsonc": "^2.18.2",
+		"eslint-plugin-markdown": "^5.1.0",
+		"eslint-plugin-n": "^17.15.1",
+		"eslint-plugin-perfectionist": "^4.6.0",
+		"eslint-plugin-regexp": "^2.7.0",
+		"eslint-plugin-yml": "^1.16.0",
 		"husky": "^9.0.0",
 		"jsonc-eslint-parser": "^2.4.0",
 		"knip": "^5.0.0",
-		"lint-staged": "^15.2.0",
-		"markdownlint": "^0.37.0",
+		"lint-staged": "^15.3.0",
+		"markdownlint": "^0.37.4",
 		"markdownlint-cli": "^0.43.0",
-		"npm-package-json-lint": "^8.0.0",
-		"npm-package-json-lint-config-default": "^7.0.0",
 		"prettier": "^3.2.4",
 		"prettier-plugin-curly": "^0.3.0",
 		"prettier-plugin-packagejson": "^2.4.9",
 		"release-it": "^18.0.0",
 		"should-semantic-release": "^0.3.0",
 		"tsup": "^8.0.1",
-		"typescript": "^5.3.3",
-		"vitest": "^1.2.1",
-		"yaml-eslint-parser": "^1.2.2"
+		"typescript": "^5.7.3",
+		"typescript-eslint": "^8.20.0",
+		"vitest": "^1.2.1"
 	},
 	"peerDependencies": {
 		"eslint": ">=8.0.0",