v11.0.0: Update rules to match HTML Academy codeguide

[meritt]

Major update of ESLint config aligned with htmlacademy/codeguide#75.

Breaking Changes

• Minimum Node.js version: 24
• Minimum ESLint version: 10
• TypeScript >=5 required as peer dependency
• Flat config format only (not compatible with .eslintrc)
• ES modules only ("type": "module")
• Removed legacy configs: es5, es5.5, es6 (rules merged into vanilla)
• index.js is now a barrel re-export, not a depends list

Dependencies

Package	Before	After
eslint (peer)	>=7	>=10
eslint (dev)	8.48.0	^10.2.0
typescript (peer)	—	>=5
@eslint/js	—	^10.0.0
@stylistic/eslint-plugin	—	^5.10.0
@eslint-react/eslint-plugin	—	^4.2.0
eslint-plugin-check-file	2.6.2	^3.3.0
eslint-plugin-n	—	^17.24.0
eslint-plugin-unicorn	46.0.0	^64.0.0
typescript-eslint	—	^8.58.0
eslint-plugin-node	^11.1.0	removed
eslint-plugin-react	^7.32.2	removed

ESLint Rules

vanilla.js

Rules from removed es5.js / es5.5.js / es6.js merged in: guard-for-in, no-caller, no-eval, no-extend-native, no-extra-bind, no-implied-eval, no-invalid-this, no-iterator, no-labels, no-lone-blocks, no-multi-str, no-new, no-new-func, no-new-wrappers, no-octal-escape, no-proto, no-script-url, no-sequences, no-throw-literal, no-with, consistent-return, max-nested-callbacks, yoda.

New

• prefer-rest-params — use rest params instead of arguments

• prefer-spread — use spread syntax instead of .apply()

• no-object-constructor — disallows new Object() (replaces deprecated no-new-object)

• object-shorthand: ['error', 'always', {avoidQuotes: true}] — enforces shorthand
  properties/methods in object literals, except when the key requires quoting

• @stylistic/function-call-spacing: ['error', 'always'] — requires space before call
  parentheses: fn () instead of fn() (HTML Academy convention)

• @stylistic/generator-star-spacing: ['error', 'after'] — function* gen() style

• @stylistic/rest-spread-spacing — no space after rest/spread operator

• @stylistic/yield-star-spacing: ['error', 'after'] — yield* expression style

• @stylistic/no-floating-decimal — requires leading zero: 0.5 instead of .5

• @stylistic/comma-style — comma at the end of the line, not the beginning

• @stylistic/computed-property-spacing — no spaces inside computed property brackets

• @stylistic/key-spacing — consistent spacing around colon in object keys

• @stylistic/keyword-spacing — space before/after keywords (if, else, return, etc.)

• @stylistic/lines-between-class-members — blank line between class members (except
  after single-line members)

• @stylistic/no-extra-semi — no unnecessary semicolons

Modified

Rule	Before	After
comma-dangle	'only-multiline'	'always-multiline'
quotes	{allowTemplateLiterals: true}	{allowTemplateLiterals: 'always'}

comma-dangle: 'always-multiline' requires trailing commas in multiline constructs (previously only allowed them).

Removed

• valid-jsdoc — deprecated in ESLint, removed
• no-new-object — replaced by no-object-constructor
• linebreak-style — removed
• no-process-exit — moved to node.js config scope only

node.js

Modified

Rule	Before	After
node/* → n/*	eslint-plugin-node	eslint-plugin-n
@typescript-eslint/no-shadow	'error'	['error', {hoist: 'all'}]

Cleaned up: removed 12 disabled/off rules that provided no value (node/no-exports-assign, node/exports-style, node/no-sync, node/no-process-env, etc.)

react.js

Plugin replacement: react/* → @eslint-react/*, JSX formatting → @stylistic/jsx-*.

Before	After
react/no-array-index-key	@eslint-react/no-array-index-key
react/no-access-state-in-setstate	@eslint-react/no-access-state-in-setstate
react/jsx-no-useless-fragment	@eslint-react/no-useless-fragment
react/jsx-closing-bracket-location	@stylistic/jsx-closing-bracket-location
react/jsx-closing-tag-location	@stylistic/jsx-closing-tag-location
react/jsx-curly-newline	@stylistic/jsx-curly-newline
react/jsx-wrap-multilines	@stylistic/jsx-wrap-multilines

Removed

• react/no-unused-prop-types — not available in @eslint-react
• react/jsx-boolean-value — not available in @eslint-react

react-typescript.js

Uses tseslint.configs.recommendedTypeChecked + eslintReact.configs['recommended-type-checked']
instead of manual extends.

Modified

Rule	Before	After
@typescript-eslint/no-shadow	'error'	['error', {hoist: 'all'}]
@typescript-eslint/no-unused-vars	['error']	['error', {args: 'after-used', argsIgnorePattern: '^_'}]

Removed

• @typescript-eslint/member-delimiter-style — handled by @stylistic
• react/jsx-uses-react: 'off' — not needed in @eslint-react
• react/react-in-jsx-scope: 'off' — not needed in @eslint-react