Tweak and re-organize ESLint config (#38369)

* Tweak and re-organize ESLint config

* merge individual configs to the root config
* enable more eslint-plugin-import rules
* lint markdown files

* Lint

9 files changed, 25 insertions, 27 deletions

diff --git a/js/tests/unit/util/backdrop.spec.js b/js/tests/unit/util/backdrop.spec.js
index 73384fc90..0faaac6a5 100644
--- a/js/tests/unit/util/backdrop.spec.js
+++ b/js/tests/unit/util/backdrop.spec.js
@@ -1,6 +1,6 @@
-import Backdrop from '../../../src/util/backdrop'
-import { getTransitionDurationFromElement } from '../../../src/util/index'
-import { clearFixture, getFixture } from '../../helpers/fixture'
+import Backdrop from '../../../src/util/backdrop.js'
+import { getTransitionDurationFromElement } from '../../../src/util/index.js'
+import { clearFixture, getFixture } from '../../helpers/fixture.js'
 
 const CLASS_BACKDROP = '.modal-backdrop'
 const CLASS_NAME_FADE = 'fade'
diff --git a/js/tests/unit/util/component-functions.spec.js b/js/tests/unit/util/component-functions.spec.js
index ec36672cb..ce83785e2 100644
--- a/js/tests/unit/util/component-functions.spec.js
+++ b/js/tests/unit/util/component-functions.spec.js
@@ -1,8 +1,6 @@
-/* Test helpers */
-
-import { clearFixture, createEvent, getFixture } from '../../helpers/fixture'
-import { enableDismissTrigger } from '../../../src/util/component-functions'
-import BaseComponent from '../../../src/base-component'
+import BaseComponent from '../../../src/base-component.js'
+import { enableDismissTrigger } from '../../../src/util/component-functions.js'
+import { clearFixture, createEvent, getFixture } from '../../helpers/fixture.js'
 
 class DummyClass2 extends BaseComponent {
   static get NAME() {
diff --git a/js/tests/unit/util/config.spec.js b/js/tests/unit/util/config.spec.js
index 0037e09d7..93987a74a 100644
--- a/js/tests/unit/util/config.spec.js
+++ b/js/tests/unit/util/config.spec.js
@@ -1,5 +1,5 @@
-import Config from '../../../src/util/config'
-import { clearFixture, getFixture } from '../../helpers/fixture'
+import Config from '../../../src/util/config.js'
+import { clearFixture, getFixture } from '../../helpers/fixture.js'
 
 class DummyConfigClass extends Config {
   static get NAME() {
diff --git a/js/tests/unit/util/focustrap.spec.js b/js/tests/unit/util/focustrap.spec.js
index bedd124c9..0a20017d5 100644
--- a/js/tests/unit/util/focustrap.spec.js
+++ b/js/tests/unit/util/focustrap.spec.js
@@ -1,7 +1,7 @@
-import FocusTrap from '../../../src/util/focustrap'
-import EventHandler from '../../../src/dom/event-handler'
-import SelectorEngine from '../../../src/dom/selector-engine'
-import { clearFixture, createEvent, getFixture } from '../../helpers/fixture'
+import EventHandler from '../../../src/dom/event-handler.js'
+import SelectorEngine from '../../../src/dom/selector-engine.js'
+import FocusTrap from '../../../src/util/focustrap.js'
+import { clearFixture, createEvent, getFixture } from '../../helpers/fixture.js'
 
 describe('FocusTrap', () => {
   let fixtureEl
diff --git a/js/tests/unit/util/index.spec.js b/js/tests/unit/util/index.spec.js
index 202c72061..4065a9168 100644
--- a/js/tests/unit/util/index.spec.js
+++ b/js/tests/unit/util/index.spec.js
@@ -1,6 +1,6 @@
-import * as Util from '../../../src/util/index'
-import { clearFixture, getFixture } from '../../helpers/fixture'
-import { noop } from '../../../src/util/index'
+import * as Util from '../../../src/util/index.js'
+import { noop } from '../../../src/util/index.js'
+import { clearFixture, getFixture } from '../../helpers/fixture.js'
 
 describe('Util', () => {
   let fixtureEl
diff --git a/js/tests/unit/util/sanitizer.spec.js b/js/tests/unit/util/sanitizer.spec.js
index c656aed35..55e9b6336 100644
--- a/js/tests/unit/util/sanitizer.spec.js
+++ b/js/tests/unit/util/sanitizer.spec.js
@@ -1,4 +1,4 @@
-import { DefaultAllowlist, sanitizeHtml } from '../../../src/util/sanitizer'
+import { DefaultAllowlist, sanitizeHtml } from '../../../src/util/sanitizer.js'
 
 describe('Sanitizer', () => {
   describe('sanitizeHtml', () => {
diff --git a/js/tests/unit/util/scrollbar.spec.js b/js/tests/unit/util/scrollbar.spec.js
index 6fcf5718b..6dadfcdd1 100644
--- a/js/tests/unit/util/scrollbar.spec.js
+++ b/js/tests/unit/util/scrollbar.spec.js
@@ -1,6 +1,6 @@
-import { clearBodyAndDocument, clearFixture, getFixture } from '../../helpers/fixture'
-import Manipulator from '../../../src/dom/manipulator'
-import ScrollBarHelper from '../../../src/util/scrollbar'
+import Manipulator from '../../../src/dom/manipulator.js'
+import ScrollBarHelper from '../../../src/util/scrollbar.js'
+import { clearBodyAndDocument, clearFixture, getFixture } from '../../helpers/fixture.js'
 
 describe('ScrollBar', () => {
   let fixtureEl
diff --git a/js/tests/unit/util/swipe.spec.js b/js/tests/unit/util/swipe.spec.js
index f92bb5d00..9252d312b 100644
--- a/js/tests/unit/util/swipe.spec.js
+++ b/js/tests/unit/util/swipe.spec.js
@@ -1,7 +1,7 @@
-import { clearFixture, getFixture } from '../../helpers/fixture'
-import EventHandler from '../../../src/dom/event-handler'
-import Swipe from '../../../src/util/swipe'
-import { noop } from '../../../src/util'
+import EventHandler from '../../../src/dom/event-handler.js'
+import { noop } from '../../../src/util/index.js'
+import Swipe from '../../../src/util/swipe.js'
+import { clearFixture, getFixture } from '../../helpers/fixture.js'
 
 describe('Swipe', () => {
   const { Simulator, PointerEvent } = window
diff --git a/js/tests/unit/util/template-factory.spec.js b/js/tests/unit/util/template-factory.spec.js
index 5e5724c5f..07f4d91c7 100644
--- a/js/tests/unit/util/template-factory.spec.js
+++ b/js/tests/unit/util/template-factory.spec.js
@@ -1,5 +1,5 @@
-import { clearFixture, getFixture } from '../../helpers/fixture'
-import TemplateFactory from '../../../src/util/template-factory'
+import TemplateFactory from '../../../src/util/template-factory.js'
+import { clearFixture, getFixture } from '../../helpers/fixture.js'
 
 describe('TemplateFactory', () => {
   let fixtureEl