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-test/src/env/expect.ts

@@ -164,7 +164,7 @@ function assertMatchStr (value: unknown, check: string | RegExp): void {
  *
  * @see https://github.com/facebook/jest/blob/a49c88610e49a3242576160740a32a2fe11161e1/packages/expect/src/asymmetricMatchers.ts#L103-L133
  */
-// eslint-disable-next-line @typescript-eslint/ban-types
+// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
 function assertInstanceOf (value: unknown, Clazz: Function): void {
   assert.ok(
     (Clazz === Array && Array.isArray(value)) ||
@@ -188,7 +188,7 @@ function assertInstanceOf (value: unknown, Clazz: Function): void {
  * @param {string | unknown[]} value
  * @param {string} check
  */
-// eslint-disable-next-line @typescript-eslint/ban-types
+// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
 function assertIncludes (value: string | unknown[], [check, Clazz]: [string, Function]): void {
   assertInstanceOf(value, Clazz);
   assert.ok(value?.includes(check), `${value as string} does not include ${check}`);
@@ -201,7 +201,7 @@ function assertIncludes (value: string | unknown[], [check, Clazz]: [string, Fun
  **/
 export function expect () {
   const rootMatchers = {
-    // eslint-disable-next-line @typescript-eslint/ban-types
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
     any: (Clazz: Function) => new Matcher(assertInstanceOf, Clazz),
     anything: () => new Matcher(assertNonNullish),
     arrayContaining: (check: string) => new Matcher(assertIncludes, [check, Array]),
@@ -229,7 +229,7 @@ export function expect () {
         toBe: (other: unknown) => assert.strictEqual(value, other),
         toBeDefined: () => assert.ok(value !== undefined),
         toBeFalsy: () => assert.ok(!value),
-        // eslint-disable-next-line @typescript-eslint/ban-types
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
         toBeInstanceOf: (Clazz: Function) => assertInstanceOf(value, Clazz),
         toBeNull: (value: unknown) => assert.ok(value === null),
         toBeTruthy: () => assert.ok(value),

packages/dev-test/src/env/jest.ts

@@ -32,7 +32,7 @@ function extendMock <F extends AnyFn> (mocked: WithMock<F>) {
   //
   // Effectively the casts below ensure that our WithMock<*> aligns
   // on a high-level to what we use via private type...
-  const spy = (mocked as unknown as ReturnType<typeof mock['fn']>);
+  const spy = mocked as unknown as ReturnType<typeof mock['fn']>;
 
   return enhanceObj(enhanceObj(mocked, {
     mockImplementation: <F extends AnyFn> (fn: F): void => {

packages/dev-test/src/env/suite.ts

@@ -35,10 +35,10 @@ const MINUTE = 60 * 1000;
  * Wraps either describe or it with relevant .only, .skip, .todo & .each helpers,
  * shimming it into a Jest-compatible environment.
  *
- * @param {} fn
+ * Describe and It have the same shape, so one return type serves both.
  */
-function createWrapper <T extends WrapFn> (fn: T, defaultTimeout: number): Describe | It {
+function createWrapper (fn: WrapFn, defaultTimeout: number): Describe {
-  const wrap = (opts: WrapOpts) => (name: string, exec: () => void | Promise<void>, timeout?: number) => fn(name, { ...opts, timeout: (timeout || defaultTimeout) }, exec) as unknown as void;
+  const wrap = (opts: WrapOpts): TestFn => (name: string, exec: () => void | Promise<void>, timeout?: number) => fn(name, { ...opts, timeout: (timeout || defaultTimeout) }, exec) as unknown as void;
 
   // Ensure that we have consistent helpers on the function. These are not consistently
   // applied accross all node:test versions, latest has all, so always apply ours.
@@ -47,7 +47,7 @@ function createWrapper <T extends WrapFn> (fn: T, defaultTimeout: number): Descr
     only: wrap({ only: true }),
     skip: wrap({ skip: true }),
     todo: wrap({ todo: true })
-  }) as Describe | It;
+  });
 }
 
 /**
@@ -56,7 +56,7 @@ function createWrapper <T extends WrapFn> (fn: T, defaultTimeout: number): Descr
  **/
 export function suite (): { describe: Describe; it: It } {
   return {
-    describe: createWrapper(describe, 60 * MINUTE) as Describe,
+    describe: createWrapper(describe, 60 * MINUTE),
-    it: createWrapper(it, 2 * MINUTE) as It
+    it: createWrapper(it, 2 * MINUTE)
   };
 }

packages/dev-test/src/globals.d.ts

@@ -1,8 +1,6 @@
 // Copyright 2017-2026 @pezkuwi/dev-test authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-/* eslint-disable no-var */
-
 import type { expect } from './env/expect.js';
 import type { jest } from './env/jest.js';
 import type { lifecycle } from './env/lifecycle.js';

packages/dev-test/src/types.ts

@@ -6,7 +6,7 @@ export type AnyFn = (...args: any[]) => any;
 
 export type BaseObj = Record<string, unknown>;
 
-// eslint-disable-next-line @typescript-eslint/ban-types
+// eslint-disable-next-line @typescript-eslint/no-unsafe-function-type
 export type BaseFn = Function;
 
 export type StubFn = (...args: unknown[]) => unknown;
@@ -25,4 +25,4 @@ export type WithMock<F extends AnyFn> = F & {
     resetCalls: () => void;
     restore: () => void;
   }
-}
+};

packages/dev-test/src/util.ts

@@ -27,7 +27,7 @@ function createStub <N extends readonly string[]> (keys: N, creator: (key: strin
     obj[key] ??= creator(key);
 
     return obj;
-  }, {}) as unknown as { [K in N[number]]: StubFn };
+  }, {}) as unknown as Record<N[number], StubFn>;
 }
 
 /**

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,
+      // eslint-plugin-header reports at the first token after the leading
-      header: headerPlugin,
+      // comments, so a generated file's /* eslint-disable */ covers it; the
-      import: importPlugin,
+      // 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-x/extensions': EXT_ALL,
-      'import/parsers': {
+      '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: {

packages/dev/config/eslint.rules.js

@@ -59,68 +59,17 @@ function getHeaderPattern () {
 
 export const overrideAll = {
   ...FIXME,
-  // the next 2 enforce isolatedModules & verbatimModuleSyntax
+  '@stylistic/arrow-parens': ['error', 'always'],
-  '@typescript-eslint/consistent-type-exports': 'error',
+  '@stylistic/brace-style': ['error', '1tbs'],
-  '@typescript-eslint/consistent-type-imports': 'error',
+  '@stylistic/function-call-argument-newline': ['error', 'consistent'],
-  '@typescript-eslint/dot-notation': 'error',
+  '@stylistic/indent': ['error', 2],
-  '@typescript-eslint/indent': ['error', 2],
+  '@stylistic/no-extra-semi': 'error',
-  '@typescript-eslint/no-non-null-assertion': 'error',
+  '@stylistic/object-curly-newline': ['error', {
-  // ts itself checks and ignores those starting with _, align the linting
-  '@typescript-eslint/no-unused-vars': ['error', {
-    args: 'all',
-    argsIgnorePattern: '^_',
-    caughtErrors: 'all',
-    caughtErrorsIgnorePattern: '^_',
-    destructuredArrayIgnorePattern: '^_',
-    vars: 'all',
-    varsIgnorePattern: '^_'
-  }],
-  '@typescript-eslint/type-annotation-spacing': 'error',
-  'arrow-parens': ['error', 'always'],
-  'brace-style': ['error', '1tbs'],
-  curly: ['error', 'all'],
-  'default-param-last': 'off', // conflicts with TS version
-  'deprecation/deprecation': 'error',
-  'dot-notation': 'off', // conflicts with TS version
-  'func-style': ['error', 'declaration', {
-    allowArrowFunctions: true
-  }],
-  // this does help with declarations, but also
-  // applies to invocations, which is an issue...
-  // 'function-paren-newline': ['error', 'never'],
-  'function-call-argument-newline': ['error', 'consistent'],
-  'header/header': ['error', 'line', [
-    { pattern: getHeaderPattern() },
-    ' SPDX-License-Identifier: Apache-2.0'
-  ], 2],
-  'import-newlines/enforce': ['error', {
-    forceSingleLine: true,
-    items: 2048
-  }],
-  'import/export': 'error',
-  'import/extensions': ['error', 'ignorePackages', {
-    cjs: 'always',
-    js: 'always',
-    json: 'always',
-    jsx: 'never',
-    mjs: 'always',
-    ts: 'never',
-    tsx: 'never'
-  }],
-  'import/first': 'error',
-  'import/newline-after-import': 'error',
-  'import/no-duplicates': 'error',
-  'import/order': 'off', // conflicts with simple-import-sort
-  indent: 'off', // required as 'off' since typescript-eslint has own versions
-  'no-extra-semi': 'error',
-  'no-unused-vars': 'off',
-  'no-use-before-define': 'off',
-  'object-curly-newline': ['error', {
     ExportDeclaration: { minProperties: 2048 },
     ImportDeclaration: { minProperties: 2048 },
     ObjectPattern: { minProperties: 2048 }
   }],
-  'padding-line-between-statements': [
+  '@stylistic/padding-line-between-statements': [
     'error',
     { blankLine: 'always', next: '*', prev: ['const', 'let', 'var'] },
     { blankLine: 'any', next: ['const', 'let', 'var'], prev: ['const', 'let', 'var'] },
@@ -135,7 +84,74 @@ export const overrideAll = {
     { blankLine: 'always', next: '*', prev: 'import' },
     { blankLine: 'any', next: 'import', prev: 'import' }
   ],
-  semi: ['error', 'always'],
+  '@stylistic/semi': ['error', 'always'],
+  '@stylistic/spaced-comment': ['error', 'always', {
+    block: {
+      // pure export helpers
+      markers: ['#__PURE__']
+    },
+    line: {
+      // TS reference types
+      markers: ['/ <reference']
+    }
+  }],
+  '@stylistic/type-annotation-spacing': 'error',
+  // the next 2 enforce isolatedModules & verbatimModuleSyntax
+  '@typescript-eslint/consistent-type-exports': 'error',
+  '@typescript-eslint/consistent-type-imports': 'error',
+  '@typescript-eslint/dot-notation': 'error',
+  '@typescript-eslint/no-deprecated': 'error',
+  '@typescript-eslint/no-non-null-assertion': 'error',
+  // standard's options for the core rule, which the TypeScript preset turns off
+  // in favour of this one (with defaults that reject a && b() and a ? b() : c())
+  '@typescript-eslint/no-unused-expressions': ['error', {
+    allowShortCircuit: true,
+    allowTaggedTemplates: true,
+    allowTernary: true
+  }],
+  // ts itself checks and ignores those starting with _, align the linting
+  '@typescript-eslint/no-unused-vars': ['error', {
+    args: 'all',
+    argsIgnorePattern: '^_',
+    caughtErrors: 'all',
+    caughtErrorsIgnorePattern: '^_',
+    destructuredArrayIgnorePattern: '^_',
+    vars: 'all',
+    varsIgnorePattern: '^_'
+  }],
+  curly: ['error', 'all'],
+  'default-param-last': 'off', // conflicts with TS version
+  'dot-notation': 'off', // conflicts with TS version
+  'func-style': ['error', 'declaration', {
+    allowArrowFunctions: true
+  }],
+  // this does help with declarations, but also
+  // applies to invocations, which is an issue...
+  // '@stylistic/function-paren-newline': ['error', 'never'],
+  'header/header': ['error', 'line', [
+    { pattern: getHeaderPattern() },
+    ' SPDX-License-Identifier: Apache-2.0'
+  ], 2],
+  'import-newlines/enforce': ['error', {
+    forceSingleLine: true,
+    items: 2048
+  }],
+  'import-x/export': 'error',
+  'import-x/extensions': ['error', 'ignorePackages', {
+    cjs: 'always',
+    js: 'always',
+    json: 'always',
+    jsx: 'never',
+    mjs: 'always',
+    ts: 'never',
+    tsx: 'never'
+  }],
+  'import-x/first': 'error',
+  'import-x/newline-after-import': 'error',
+  'import-x/no-duplicates': 'error',
+  'import-x/order': 'off', // conflicts with simple-import-sort
+  'no-unused-vars': 'off',
+  'no-use-before-define': 'off',
   'simple-import-sort/exports': 'error',
   'simple-import-sort/imports': ['error', {
     groups: [
@@ -150,55 +166,45 @@ export const overrideAll = {
   'sort-destructure-keys/sort-destructure-keys': ['error', {
     caseSensitive: true
   }],
-  'sort-keys': 'error',
+  'sort-keys': 'error'
-  'spaced-comment': ['error', 'always', {
-    block: {
-      // pure export helpers
-      markers: ['#__PURE__']
-    },
-    line: {
-      // TS reference types
-      markers: ['/ <reference']
-    }
-  }]
 };
 
 export const overrideJsx = {
-  'jsx-quotes': ['error', 'prefer-single'],
+  '@stylistic/jsx-closing-bracket-location': ['warn', 'tag-aligned'],
-  // swap from recommended warning to error
+  '@stylistic/jsx-first-prop-new-line': ['warn', 'multiline-multiprop'],
-  'react-hooks/exhaustive-deps': 'error',
+  '@stylistic/jsx-max-props-per-line': ['warn', {
-  'react/jsx-closing-bracket-location': ['warn', 'tag-aligned'],
-  'react/jsx-first-prop-new-line': ['warn', 'multiline-multiprop'],
-  'react/jsx-fragments': 'error',
-  'react/jsx-max-props-per-line': ['warn', {
     maximum: 1,
     when: 'always'
   }],
-  'react/jsx-newline': ['error', {
+  '@stylistic/jsx-newline': ['error', {
     prevent: true
   }],
-  'react/jsx-no-bind': 'error',
+  '@stylistic/jsx-props-no-multi-spaces': 'error',
-  'react/jsx-props-no-multi-spaces': 'error',
+  '@stylistic/jsx-quotes': ['error', 'prefer-single'],
-  'react/jsx-sort-props': ['warn', {
+  '@stylistic/jsx-sort-props': ['warn', {
     noSortAlphabetically: false
   }],
-  'react/jsx-tag-spacing': ['error', {
+  '@stylistic/jsx-tag-spacing': ['error', {
     afterOpening: 'never',
     beforeClosing: 'never',
     beforeSelfClosing: 'always',
     closingSlash: 'never'
   }],
+  // swap from recommended warning to error
+  'react-hooks/exhaustive-deps': 'error',
+  'react/jsx-fragments': 'error',
+  'react/jsx-no-bind': 'error',
   'react/prop-types': 'off' // this is a completely broken rule
 };
 
 export const overrideJs = {
   '@typescript-eslint/explicit-function-return-type': 'off',
+  '@typescript-eslint/no-require-imports': 'off',
   '@typescript-eslint/no-unsafe-argument': 'off',
   '@typescript-eslint/no-unsafe-assignment': 'off',
   '@typescript-eslint/no-unsafe-call': 'off',
   '@typescript-eslint/no-unsafe-member-access': 'off',
   '@typescript-eslint/no-unsafe-return': 'off',
-  '@typescript-eslint/no-var-requires': 'off',
   '@typescript-eslint/restrict-plus-operands': 'off',
   '@typescript-eslint/restrict-template-expressions': 'off'
 };

packages/dev/config/eslint.standard.js

@@ -0,0 +1,585 @@
+// Copyright 2017-2026 @pezkuwi/dev authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+// The rules of eslint-config-standard 17.1.0 (MIT, Copyright Feross Aboukhadijeh,
+// https://github.com/standard/eslint-config-standard), carried here once and with
+// the same options, so the lint stays what it was: that package is written for
+// eslint 8. Its formatting rules are deprecated in eslint core and continue in
+// @stylistic under the same names (func-call-spacing is function-call-spacing
+// there). no-new-object and no-new-symbol, deprecated too, are no-object-constructor
+// and no-new-native-nonconstructor here; import/* is import-x/*.
+
+export const standardRules = {
+  '@stylistic/array-bracket-spacing': [
+    'error',
+    'never'
+  ],
+  '@stylistic/arrow-spacing': [
+    'error',
+    {
+      after: true,
+      before: true
+    }
+  ],
+  '@stylistic/block-spacing': [
+    'error',
+    'always'
+  ],
+  '@stylistic/brace-style': [
+    'error',
+    '1tbs',
+    {
+      allowSingleLine: true
+    }
+  ],
+  '@stylistic/comma-dangle': [
+    'error',
+    {
+      arrays: 'never',
+      exports: 'never',
+      functions: 'never',
+      imports: 'never',
+      objects: 'never'
+    }
+  ],
+  '@stylistic/comma-spacing': [
+    'error',
+    {
+      after: true,
+      before: false
+    }
+  ],
+  '@stylistic/comma-style': [
+    'error',
+    'last'
+  ],
+  '@stylistic/computed-property-spacing': [
+    'error',
+    'never',
+    {
+      enforceForClassMembers: true
+    }
+  ],
+  '@stylistic/dot-location': [
+    'error',
+    'property'
+  ],
+  '@stylistic/eol-last': 'error',
+  '@stylistic/function-call-spacing': [
+    'error',
+    'never'
+  ],
+  '@stylistic/generator-star-spacing': [
+    'error',
+    {
+      after: true,
+      before: true
+    }
+  ],
+  '@stylistic/indent': [
+    'error',
+    2,
+    {
+      ArrayExpression: 1,
+      CallExpression: {
+        arguments: 1
+      },
+      FunctionDeclaration: {
+        body: 1,
+        parameters: 1
+      },
+      FunctionExpression: {
+        body: 1,
+        parameters: 1
+      },
+      ImportDeclaration: 1,
+      MemberExpression: 1,
+      ObjectExpression: 1,
+      SwitchCase: 1,
+      VariableDeclarator: 1,
+      flatTernaryExpressions: false,
+      ignoreComments: false,
+      ignoredNodes: [
+        'TemplateLiteral *',
+        'JSXElement',
+        'JSXElement > *',
+        'JSXAttribute',
+        'JSXIdentifier',
+        'JSXNamespacedName',
+        'JSXMemberExpression',
+        'JSXSpreadAttribute',
+        'JSXExpressionContainer',
+        'JSXOpeningElement',
+        'JSXClosingElement',
+        'JSXFragment',
+        'JSXOpeningFragment',
+        'JSXClosingFragment',
+        'JSXText',
+        'JSXEmptyExpression',
+        'JSXSpreadChild'
+      ],
+      offsetTernaryExpressions: true,
+      outerIIFEBody: 1
+    }
+  ],
+  '@stylistic/key-spacing': [
+    'error',
+    {
+      afterColon: true,
+      beforeColon: false
+    }
+  ],
+  '@stylistic/keyword-spacing': [
+    'error',
+    {
+      after: true,
+      before: true
+    }
+  ],
+  '@stylistic/lines-between-class-members': [
+    'error',
+    'always',
+    {
+      exceptAfterSingleLine: true
+    }
+  ],
+  '@stylistic/multiline-ternary': [
+    'error',
+    'always-multiline'
+  ],
+  '@stylistic/new-parens': 'error',
+  '@stylistic/no-extra-parens': [
+    'error',
+    'functions'
+  ],
+  '@stylistic/no-floating-decimal': 'error',
+  '@stylistic/no-mixed-operators': [
+    'error',
+    {
+      allowSamePrecedence: true,
+      groups: [
+        [
+          '==',
+          '!=',
+          '===',
+          '!==',
+          '>',
+          '>=',
+          '<',
+          '<='
+        ],
+        [
+          '&&',
+          '||'
+        ],
+        [
+          'in',
+          'instanceof'
+        ]
+      ]
+    }
+  ],
+  '@stylistic/no-mixed-spaces-and-tabs': 'error',
+  '@stylistic/no-multi-spaces': 'error',
+  '@stylistic/no-multiple-empty-lines': [
+    'error',
+    {
+      max: 1,
+      maxBOF: 0,
+      maxEOF: 0
+    }
+  ],
+  '@stylistic/no-tabs': 'error',
+  '@stylistic/no-trailing-spaces': 'error',
+  '@stylistic/no-whitespace-before-property': 'error',
+  '@stylistic/object-curly-newline': [
+    'error',
+    {
+      consistent: true,
+      multiline: true
+    }
+  ],
+  '@stylistic/object-curly-spacing': [
+    'error',
+    'always'
+  ],
+  // allowMultiplePropertiesPerLine was core's alias for allowAllPropertiesOnSameLine
+  // (the two were OR-ed); @stylistic only takes the latter.
+  '@stylistic/object-property-newline': [
+    'error',
+    {
+      allowAllPropertiesOnSameLine: true
+    }
+  ],
+  '@stylistic/operator-linebreak': [
+    'error',
+    'after',
+    {
+      overrides: {
+        ':': 'before',
+        '?': 'before',
+        '|>': 'before'
+      }
+    }
+  ],
+  '@stylistic/padded-blocks': [
+    'error',
+    {
+      blocks: 'never',
+      classes: 'never',
+      switches: 'never'
+    }
+  ],
+  '@stylistic/quote-props': [
+    'error',
+    'as-needed'
+  ],
+  '@stylistic/quotes': [
+    'error',
+    'single',
+    {
+      allowTemplateLiterals: 'never',
+      avoidEscape: true
+    }
+  ],
+  '@stylistic/rest-spread-spacing': [
+    'error',
+    'never'
+  ],
+  '@stylistic/semi': [
+    'error',
+    'never'
+  ],
+  '@stylistic/semi-spacing': [
+    'error',
+    {
+      after: true,
+      before: false
+    }
+  ],
+  '@stylistic/space-before-blocks': [
+    'error',
+    'always'
+  ],
+  '@stylistic/space-before-function-paren': [
+    'error',
+    'always'
+  ],
+  '@stylistic/space-in-parens': [
+    'error',
+    'never'
+  ],
+  '@stylistic/space-infix-ops': 'error',
+  '@stylistic/space-unary-ops': [
+    'error',
+    {
+      nonwords: false,
+      words: true
+    }
+  ],
+  '@stylistic/spaced-comment': [
+    'error',
+    'always',
+    {
+      block: {
+        balanced: true,
+        exceptions: [
+          '*'
+        ],
+        markers: [
+          '*package',
+          '!',
+          ',',
+          ':',
+          '::',
+          'flow-include'
+        ]
+      },
+      line: {
+        markers: [
+          '*package',
+          '!',
+          '/',
+          ',',
+          '='
+        ]
+      }
+    }
+  ],
+  '@stylistic/template-curly-spacing': [
+    'error',
+    'never'
+  ],
+  '@stylistic/template-tag-spacing': [
+    'error',
+    'never'
+  ],
+  '@stylistic/wrap-iife': [
+    'error',
+    'any',
+    {
+      functionPrototypeMethods: true
+    }
+  ],
+  '@stylistic/yield-star-spacing': [
+    'error',
+    'both'
+  ],
+  'accessor-pairs': [
+    'error',
+    {
+      enforceForClassMembers: true,
+      setWithoutGet: true
+    }
+  ],
+  'array-callback-return': [
+    'error',
+    {
+      allowImplicit: false,
+      checkForEach: false
+    }
+  ],
+  camelcase: [
+    'error',
+    {
+      allow: [
+        '^UNSAFE_'
+      ],
+      ignoreGlobals: true,
+      properties: 'never'
+    }
+  ],
+  'constructor-super': 'error',
+  curly: [
+    'error',
+    'multi-line'
+  ],
+  'default-case-last': 'error',
+  'dot-notation': [
+    'error',
+    {
+      allowKeywords: true
+    }
+  ],
+  eqeqeq: [
+    'error',
+    'always',
+    {
+      null: 'ignore'
+    }
+  ],
+  'import-x/export': 'error',
+  'import-x/first': 'error',
+  'import-x/no-absolute-path': [
+    'error',
+    {
+      amd: false,
+      commonjs: true,
+      esmodule: true
+    }
+  ],
+  'import-x/no-duplicates': 'error',
+  'import-x/no-named-default': 'error',
+  'import-x/no-webpack-loader-syntax': 'error',
+  'n/handle-callback-err': [
+    'error',
+    '^(err|error)$'
+  ],
+  'n/no-callback-literal': 'error',
+  'n/no-deprecated-api': 'error',
+  'n/no-exports-assign': 'error',
+  'n/no-new-require': 'error',
+  'n/no-path-concat': 'error',
+  'n/process-exit-as-throw': 'error',
+  'new-cap': [
+    'error',
+    {
+      capIsNew: false,
+      newIsCap: true,
+      properties: true
+    }
+  ],
+  'no-array-constructor': 'error',
+  'no-async-promise-executor': 'error',
+  'no-caller': 'error',
+  'no-case-declarations': 'error',
+  'no-class-assign': 'error',
+  'no-compare-neg-zero': 'error',
+  'no-cond-assign': 'error',
+  'no-const-assign': 'error',
+  'no-constant-condition': [
+    'error',
+    {
+      checkLoops: false
+    }
+  ],
+  'no-control-regex': 'error',
+  'no-debugger': 'error',
+  'no-delete-var': 'error',
+  'no-dupe-args': 'error',
+  'no-dupe-class-members': 'error',
+  'no-dupe-keys': 'error',
+  'no-duplicate-case': 'error',
+  'no-empty': [
+    'error',
+    {
+      allowEmptyCatch: true
+    }
+  ],
+  'no-empty-character-class': 'error',
+  'no-empty-pattern': 'error',
+  'no-eval': 'error',
+  'no-ex-assign': 'error',
+  'no-extend-native': 'error',
+  'no-extra-bind': 'error',
+  'no-extra-boolean-cast': 'error',
+  'no-fallthrough': 'error',
+  'no-func-assign': 'error',
+  'no-global-assign': 'error',
+  'no-implied-eval': 'error',
+  'no-import-assign': 'error',
+  'no-invalid-regexp': 'error',
+  'no-irregular-whitespace': 'error',
+  'no-iterator': 'error',
+  'no-labels': [
+    'error',
+    {
+      allowLoop: false,
+      allowSwitch: false
+    }
+  ],
+  'no-lone-blocks': 'error',
+  'no-loss-of-precision': 'error',
+  'no-misleading-character-class': 'error',
+  'no-multi-str': 'error',
+  'no-new': 'error',
+  'no-new-func': 'error',
+  'no-new-native-nonconstructor': 'error',
+  'no-new-wrappers': 'error',
+  'no-obj-calls': 'error',
+  'no-object-constructor': 'error',
+  'no-octal': 'error',
+  'no-octal-escape': 'error',
+  'no-proto': 'error',
+  'no-prototype-builtins': 'error',
+  'no-redeclare': [
+    'error',
+    {
+      builtinGlobals: false
+    }
+  ],
+  'no-regex-spaces': 'error',
+  'no-return-assign': [
+    'error',
+    'except-parens'
+  ],
+  'no-self-assign': [
+    'error',
+    {
+      props: true
+    }
+  ],
+  'no-self-compare': 'error',
+  'no-sequences': 'error',
+  'no-shadow-restricted-names': 'error',
+  'no-sparse-arrays': 'error',
+  'no-template-curly-in-string': 'error',
+  'no-this-before-super': 'error',
+  'no-throw-literal': 'error',
+  'no-undef': 'error',
+  'no-undef-init': 'error',
+  'no-unexpected-multiline': 'error',
+  'no-unmodified-loop-condition': 'error',
+  'no-unneeded-ternary': [
+    'error',
+    {
+      defaultAssignment: false
+    }
+  ],
+  'no-unreachable': 'error',
+  'no-unreachable-loop': 'error',
+  'no-unsafe-finally': 'error',
+  'no-unsafe-negation': 'error',
+  'no-unused-expressions': [
+    'error',
+    {
+      allowShortCircuit: true,
+      allowTaggedTemplates: true,
+      allowTernary: true
+    }
+  ],
+  'no-unused-vars': [
+    'error',
+    {
+      args: 'none',
+      caughtErrors: 'none',
+      ignoreRestSiblings: true,
+      vars: 'all'
+    }
+  ],
+  'no-use-before-define': [
+    'error',
+    {
+      classes: false,
+      functions: false,
+      variables: false
+    }
+  ],
+  'no-useless-backreference': 'error',
+  'no-useless-call': 'error',
+  'no-useless-catch': 'error',
+  'no-useless-computed-key': 'error',
+  'no-useless-constructor': 'error',
+  'no-useless-escape': 'error',
+  'no-useless-rename': 'error',
+  'no-useless-return': 'error',
+  'no-var': 'warn',
+  'no-void': 'error',
+  'no-with': 'error',
+  'object-shorthand': [
+    'warn',
+    'properties'
+  ],
+  'one-var': [
+    'error',
+    {
+      initialized: 'never'
+    }
+  ],
+  'prefer-const': [
+    'error',
+    {
+      destructuring: 'all'
+    }
+  ],
+  'prefer-promise-reject-errors': 'error',
+  'prefer-regex-literals': [
+    'error',
+    {
+      disallowRedundantWrapping: true
+    }
+  ],
+  'promise/param-names': 'error',
+  'symbol-description': 'error',
+  'unicode-bom': [
+    'error',
+    'never'
+  ],
+  'use-isnan': [
+    'error',
+    {
+      enforceForIndexOf: true,
+      enforceForSwitchCase: true
+    }
+  ],
+  'valid-typeof': [
+    'error',
+    {
+      requireStringLiterals: true
+    }
+  ],
+  yoda: [
+    'error',
+    'never'
+  ]
+};

packages/dev/package.json

@@ -3,7 +3,7 @@
   "bugs": "https://git.pezkuwichain.io/pezkuwichain/pezkuwi-dev/issues",
   "description": "A collection of shared CI scripts and development environment used by @pezkuwi projects",
   "engines": {
-    "node": ">=18"
+    "node": ">=20.19"
   },
   "homepage": "https://git.pezkuwichain.io/pezkuwichain/pezkuwi-dev/tree/master/packages/dev#readme",
   "license": "Apache-2.0",
@@ -49,47 +49,47 @@
     "./rootJs/testJson.json": "./src/rootJs/testJson.json"
   },
   "dependencies": {
-    "@eslint/js": "^8.56.0",
+    "@eslint/compat": "^2.1.1",
+    "@eslint/js": "^10.0.1",
     "@pezkuwi/dev-test": "^0.85.12",
     "@pezkuwi/dev-ts": "^0.85.12",
     "@rollup/plugin-alias": "^5.1.1",
-    "@rollup/plugin-commonjs": "^25.0.8",
+    "@rollup/plugin-commonjs": "^29.0.3",
     "@rollup/plugin-dynamic-import-vars": "^2.1.5",
     "@rollup/plugin-inject": "^5.0.5",
     "@rollup/plugin-json": "^6.1.0",
-    "@rollup/plugin-node-resolve": "^15.3.1",
+    "@rollup/plugin-node-resolve": "^16.0.3",
+    "@stylistic/eslint-plugin": "^5.10.0",
     "@tsconfig/strictest": "^2.0.2",
-    "@typescript-eslint/eslint-plugin": "^6.19.1",
+    "@typescript-eslint/eslint-plugin": "^8.71.1",
-    "@typescript-eslint/parser": "^6.19.1",
+    "@typescript-eslint/parser": "^8.71.1",
-    "eslint": "^8.56.0",
+    "eslint": "^10.12.0",
-    "eslint-config-standard": "^17.1.0",
     "eslint-import-resolver-node": "^0.3.9",
-    "eslint-import-resolver-typescript": "^3.6.1",
+    "eslint-import-resolver-typescript": "^4.4.5",
-    "eslint-plugin-deprecation": "^2.0.0",
     "eslint-plugin-header": "^3.1.1",
-    "eslint-plugin-import": "^2.29.1",
+    "eslint-plugin-import-newlines": "^2.0.0",
-    "eslint-plugin-import-newlines": "^1.3.4",
+    "eslint-plugin-import-x": "^4.17.1",
-    "eslint-plugin-jest": "^27.6.3",
+    "eslint-plugin-jest": "^29.16.6",
-    "eslint-plugin-n": "^16.6.2",
+    "eslint-plugin-n": "^18.4.1",
-    "eslint-plugin-promise": "^6.1.1",
+    "eslint-plugin-promise": "^7.3.0",
-    "eslint-plugin-react": "^7.33.2",
+    "eslint-plugin-react": "^7.37.5",
-    "eslint-plugin-react-hooks": "^4.6.0",
+    "eslint-plugin-react-hooks": "^7.1.1",
-    "eslint-plugin-simple-import-sort": "^10.0.0",
+    "eslint-plugin-simple-import-sort": "^14.0.0",
-    "eslint-plugin-sort-destructure-keys": "^1.5.0",
+    "eslint-plugin-sort-destructure-keys": "^3.0.0",
-    "espree": "^9.6.1",
+    "espree": "^11.2.0",
     "gh-pages": "^6.1.1",
-    "gh-release": "^7.0.2",
+    "gh-release": "^8.1.0",
-    "globals": "^13.24.0",
+    "globals": "^17.13.0",
     "json5": "^2.2.3",
-    "madge": "^6.1.0",
+    "madge": "^8.0.0",
     "rollup": "^4.9.6",
     "rollup-plugin-cleanup": "^3.2.1",
     "tslib": "^2.7.0",
     "typescript": "^5.5.4",
     "webpack": "^5.89.0",
-    "webpack-cli": "^5.1.4",
+    "webpack-cli": "^7.2.3",
-    "webpack-dev-server": "^4.15.1",
+    "webpack-dev-server": "^6.0.0",
-    "webpack-merge": "^5.10.0",
+    "webpack-merge": "^6.0.1",
     "webpack-subresource-integrity": "^5.2.0-rc.1",
     "yargs": "^17.7.2"
   },

packages/dev/scripts/pezkuwi-dev-build-ts.mjs

@@ -1119,8 +1119,8 @@ function lintInput (dir) {
       // file will also be caught in the net, i.e. we expect all files to conform
       if (n === 0 && (
         !/\/\/ Copyright .* @pezkuwi\//.test(l) &&
-        !/\/\/ Auto-generated via `/.test(l) &&
+        !l.includes('// Auto-generated via `') &&
-        !/#!\/usr\/bin\/env node/.test(l)
+        !l.includes('#!/usr/bin/env node')
       )) {
         return createError(full, l, n, 'Invalid header definition');
       }
@@ -1281,7 +1281,7 @@ function extractPackageInfoImports (filepath, withDetectImport) {
     .readFileSync(filepath, { encoding: 'utf-8' })
     .split('\n')
     .forEach((l) => {
-      const match = l.match(/import \{ packageInfo as (.*) \}/);
+      const match = /import \{ packageInfo as (.*) \}/.exec(l);
 
       if (match) {
         otherImports.push(l);
@@ -1290,8 +1290,8 @@ function extractPackageInfoImports (filepath, withDetectImport) {
     });
 
   otherImports.sort((a, b) => {
-    const am = a.match(/\} from '(.*)';/);
+    const am = /\} from '(.*)';/.exec(a);
-    const bm = b.match(/\} from '(.*)';/);
+    const bm = /\} from '(.*)';/.exec(b);
 
     if (!am) {
       throw new Error(`Unable to extract from import from ${a}`);

packages/dev/scripts/pezkuwi-exec-node-test.mjs

@@ -122,7 +122,7 @@ function getFilename (r) {
       .split('\n')
       .map((l) => l.trim())
       .filter((l) => l.startsWith('at ') && (l.includes('.spec.') || l.includes('.test.')))
-      .map((l) => l.match(/\(.*:\d\d?:\d\d?\)$/)?.[0])
+      .map((l) => (/\(.*:\d\d?:\d\d?\)$/.exec(l))?.[0])
       .map((l) => l?.replace('(', '')?.replace(')', ''));
 
     if (stack.length) {
@@ -186,7 +186,7 @@ function complete () {
 
       if (typeof r === 'string') {
         console.log(r); // Node.js <= 18.14
-      } else if (r.file && r.file.includes('@pezkuwi/dev/scripts')) {
+      } else if (r.file?.includes('@pezkuwi/dev/scripts')) {
         // Ignore internal diagnostics
       } else {
         if (lastFilename !== r.file) {
@@ -328,11 +328,11 @@ if (isMainThread) {
 } else {
   run({ files: workerData.files, timeout: 3_600_000 })
     .on('data', () => undefined)
-    .on('end', () => parentPort && parentPort.postMessage(stats))
+    .on('end', () => parentPort?.postMessage(stats))
     .on('test:coverage', () => undefined)
     .on('test:diagnostic', (/** @type {DiagStat} */data) => {
       stats.diag.push(data);
-      parentPort && parentPort.postMessage({ data: stats, type: 'result' });
+      parentPort?.postMessage({ data: stats, type: 'result' });
     })
     .on('test:fail', (/** @type {FailStat} */ data) => {
       const statFail = structuredClone(data);
@@ -343,7 +343,7 @@ if (isMainThread) {
 
       stats.fail.push(statFail);
       stats.total++;
-      parentPort && parentPort.postMessage({ data: 'x', type: 'progress' });
+      parentPort?.postMessage({ data: 'x', type: 'progress' });
 
       if (bail) {
         complete();
@@ -361,7 +361,7 @@ if (isMainThread) {
       }
 
       stats.total++;
-      parentPort && parentPort.postMessage({ data: symbol, type: 'progress' });
+      parentPort?.postMessage({ data: symbol, type: 'progress' });
     })
     .on('test:plan', () => undefined)
     .on('test:start', () => undefined);

packages/dev/scripts/util.mjs

@@ -83,7 +83,7 @@ export function copyDirSync (src, dest, include, exclude) {
         if (fs.statSync(srcPath).isDirectory()) {
           copyDirSync(srcPath, path.join(dest, file), include, exclude);
         } else if (!include?.length || include.some((e) => file.endsWith(e))) {
-          if (!exclude || !exclude.some((e) => file.endsWith(e))) {
+          if (!exclude?.some((e) => file.endsWith(e))) {
             copyFileSync(srcPath, dest);
           }
         }
@@ -480,7 +480,7 @@ export function topoSort (dirs) {
     visited[key] = true;
 
     node.vertices.forEach((i) => {
-      if (ancestors.indexOf(i) >= 0) {
+      if (ancestors.includes(i)) {
         console.log('CIRCULAR: closed chain : ' + i + ' is in ' + id);
 
         if (nodes[id].vertices.includes(i)) {

packages/dev/src/rootCjs.spec.ts

@@ -11,4 +11,13 @@ import type * as testRoot from './root.js';
 import testRootBuild from '../build/cjs/root.js';
 import { runTests } from './rootTests.js';
 
-runTests(testRootBuild as unknown as typeof testRoot);
+/**
+ * The CommonJS build is untyped until it is built, and lint runs both before
+ * and after the build. Casting from unknown here is needed either way, so the
+ * outcome does not depend on whether build/ exists.
+ */
+function asRoot (build: unknown): typeof testRoot {
+  return build as typeof testRoot;
+}
+
+runTests(asRoot(testRootBuild));

packages/dev/src/rootJs/Clazz.ts

@@ -7,7 +7,7 @@ export class Clazz {
   readonly and: number;
 
   static staticProperty = 'foobar';
-  static staticFunction = (): string|null => Clazz.staticProperty;
+  static staticFunction = (): string | null => Clazz.staticProperty;
 
   /**
    * @param and the number we should and with

packages/dev/src/rootJs/index.ts

@@ -22,7 +22,6 @@ export async function dynamic (a: number, b: number): Promise<number> {
   // and CJS output (a './dynamic' import would be different otherwise)
   const { sum } = await import('@pezkuwi/dev/rootJs/dynamic.mjs');
 
-  // eslint-disable-next-line @typescript-eslint/no-unsafe-return
   return sum(a, b);
 }