Move the toolchain to eslint 10, typescript-eslint 8 and current plugins

eslint 8 and typescript-eslint 6 are past their support, and the webpack
dev server chain carried the dependency alerts every repository using this
package inherited. Upstream @polkadot/dev still pins the same versions, so
this leaves it on purpose.

The rules are carried over with their options, so the lint means what it
meant:

- eslint-config-standard 17 (written for eslint 8) is replaced by its 161
  rules in config/eslint.standard.js, with their options. Its 48 formatting
  rules, deprecated in eslint core, are the same rules in @stylistic;
  no-new-object and no-new-symbol are no-object-constructor and
  no-new-native-nonconstructor; import/* is import-x/*.
- eslint-plugin-import (eslint <= 9) is eslint-plugin-import-x;
  eslint-plugin-deprecation is @typescript-eslint/no-deprecated; the
  formatting rules of core, typescript-eslint and eslint-plugin-react used
  in eslint.rules.js are their @stylistic versions with the same options.
- typescript-eslint 8's preset swaps core no-unused-expressions for its own
  with default options; standard's (short circuit, ternary and tagged
  templates allowed) are carried over to it.
- eslint-plugin-react and eslint-plugin-header still call context methods
  eslint 10 removed; @eslint/compat's fixupPluginRules supplies them. The
  header rule also gets `schema: false`, as eslint 9+ rejects options for a
  rule with no schema. The original header plugin stays rather than its
  fork: it reports at the first token after leading comments, so a
  generated file's /* eslint-disable */ still covers it, as it always has.

The effective config was compared rule by rule (--print-config) for .ts,
.tsx, .spec.ts and .mjs files before and after. Every rule that left has
its successor active; option differences are eslint 10 spelling out
defaults. New rules come from the eslint 10, typescript-eslint 8 and
react-hooks 7 presets. no-inner-declarations left eslint's preset upstream.

Also current: webpack-dev-server 6, webpack-cli 7, webpack-merge 6, rollup
plugins, madge 8, gh-release 8, globals 17, espree 11; Node >= 20.19 for
the dev package, which eslint 10 requires.

In this repository the new rules found: Function types now named by
no-unsafe-function-type; optional chains, includes() and RegExp#exec where
they say the same thing; createWrapper returns Describe, so its three casts
were redundant; rootCjs.spec casts through unknown, so the lint result does
not depend on whether build/ exists. lint, build and test (149 passed) pass,
and lint leaves the tree unchanged with and without a build.

packages/dev/config/eslint.js

@@ -1,34 +1,44 @@
 // Copyright 2017-2026 @pezkuwi/dev authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-// @ts-expect-error No definition for this one
+import { fixupPluginRules } from '@eslint/compat';
 import eslintJs from '@eslint/js';
+import stylisticPlugin from '@stylistic/eslint-plugin';
 import tsPlugin from '@typescript-eslint/eslint-plugin';
 import tsParser from '@typescript-eslint/parser';
 // @ts-expect-error No definition for this one
-import standardConfig from 'eslint-config-standard';
-import deprecationPlugin from 'eslint-plugin-deprecation';
-// @ts-expect-error No definition for this one
 import headerPlugin from 'eslint-plugin-header';
-import importPlugin from 'eslint-plugin-import';
 // @ts-expect-error No definition for this one
 import importNewlinesPlugin from 'eslint-plugin-import-newlines';
-// @ts-expect-error No definition for this one
+import importPlugin from 'eslint-plugin-import-x';
 import jestPlugin from 'eslint-plugin-jest';
-// @ts-expect-error No definition for this one
 import nPlugin from 'eslint-plugin-n';
 // @ts-expect-error No definition for this one
 import promisePlugin from 'eslint-plugin-promise';
 import reactPlugin from 'eslint-plugin-react';
-// @ts-expect-error No definition for this one
 import reactHooksPlugin from 'eslint-plugin-react-hooks';
-// @ts-expect-error No definition for this one
 import simpleImportSortPlugin from 'eslint-plugin-simple-import-sort';
 // @ts-expect-error No definition for this one
 import sortDestructureKeysPlugin from 'eslint-plugin-sort-destructure-keys';
 import globals from 'globals';
 
 import { overrideAll, overrideJs, overrideJsx, overrideSpec } from './eslint.rules.js';
+import { standardRules } from './eslint.standard.js';
+
+/**
+ * eslint-plugin-header declares no options schema, and eslint 9+ rejects
+ * options for a rule without one. `schema: false` is how a rule says it
+ * validates its own options; the rule itself is unchanged.
+ */
+const headerPluginFixed = {
+  ...headerPlugin,
+  rules: {
+    header: {
+      ...headerPlugin.rules.header,
+      meta: { ...headerPlugin.rules.header.meta, schema: false }
+    }
+  }
+};
 
 const EXT_JS = ['.cjs', '.js', '.mjs'];
 const EXT_TS = ['.ts', '.tsx'];
@@ -82,23 +92,27 @@ export default [
       }
     },
     plugins: {
+      '@stylistic': stylisticPlugin,
       '@typescript-eslint': tsPlugin,
-      deprecation: deprecationPlugin,
-      header: headerPlugin,
-      import: importPlugin,
+      // eslint-plugin-header reports at the first token after the leading
+      // comments, so a generated file's /* eslint-disable */ covers it; the
+      // maintained fork reports at line 1 instead. The compat layer supplies the
+      // context methods eslint 10 removed; headerPluginFixed, the options schema.
+      header: fixupPluginRules(headerPluginFixed),
       'import-newlines': importNewlinesPlugin,
+      'import-x': importPlugin,
       n: nPlugin,
       promise: promisePlugin,
       'simple-import-sort': simpleImportSortPlugin,
       'sort-destructure-keys': sortDestructureKeysPlugin
     },
     settings: {
-      'import/extensions': EXT_ALL,
-      'import/parsers': {
+      'import-x/extensions': EXT_ALL,
+      'import-x/parsers': {
         '@typescript-eslint/parser': EXT_TS,
         espree: EXT_JS
       },
-      'import/resolver': {
+      'import-x/resolver': {
         node: {
           extensions: EXT_ALL
         },
@@ -112,7 +126,7 @@ export default [
     files: extsToGlobs(EXT_ALL),
     rules: {
       ...eslintJs.configs.recommended.rules,
-      ...standardConfig.rules,
+      ...standardRules,
       ...tsPlugin.configs['recommended-type-checked'].rules,
       ...tsPlugin.configs['stylistic-type-checked'].rules,
       ...overrideAll
@@ -130,7 +144,9 @@ export default [
       '**/use*.ts'
     ],
     plugins: {
-      react: reactPlugin,
+      // eslint-plugin-react still calls context methods eslint 10 removed
+      // (getFilename and others); the compat layer provides them.
+      react: fixupPluginRules(reactPlugin),
       'react-hooks': reactHooksPlugin
     },
     rules: {