fix: add file extension to Theme imports and respective eslint rule

.eslintrc.json

@@ -1,6 +1,11 @@
 {
     "root": true,
-    "plugins": ["notice", "@spectrum-web-components", "import"],
+    "plugins": [
+        "notice",
+        "@spectrum-web-components",
+        "import",
+        "require-extensions"
+    ],
     "env": {
         "browser": true,
         "node": true,
@@ -64,7 +69,11 @@
             }
         ]
     },
-    "extends": ["plugin:prettier/recommended", "plugin:lit-a11y/recommended"],
+    "extends": [
+        "plugin:prettier/recommended",
+        "plugin:lit-a11y/recommended",
+        "plugin:require-extensions/recommended"
+    ],
     "overrides": [
         {
             "files": ["tasks/*", "scripts/*"],

package.json

@@ -156,6 +156,7 @@
         "eslint-plugin-lit-a11y": "^2.2.2",
         "eslint-plugin-notice": "^0.9.10",
         "eslint-plugin-prettier": "^5.1.3",
+        "eslint-plugin-require-extensions": "^0.1.3",
         "eslint-plugin-storybook": "^0.8.0",
         "express": "^4.16.4",
         "fast-glob": "^3.2.12",

tools/.eslintrc.json

@@ -6,15 +6,26 @@
         "es6": true
     },
     "parser": "@typescript-eslint/parser",
-    "plugins": ["@typescript-eslint", "notice", "@spectrum-web-components"],
+    "plugins": [
+        "@typescript-eslint",
+        "notice",
+        "@spectrum-web-components",
+        "require-extensions"
+    ],
     "extends": [
         "plugin:@typescript-eslint/recommended",
         "prettier",
-        "plugin:lit-a11y/recommended"
+        "plugin:lit-a11y/recommended",
+        "plugin:require-extensions/recommended"
     ],
     "rules": {
         "no-debugger": 2,
-        "no-console": ["error", { "allow": ["warn", "error"] }],
+        "no-console": [
+            "error",
+            {
+                "allow": ["warn", "error"]
+            }
+        ],
         "@spectrum-web-components/prevent-argument-names": [
             "error",
             ["e", "ev", "evt", "err"]

tools/theme/src/Theme.ts

@@ -27,7 +27,7 @@ import {
     SystemVariant,
     ThemeFragmentMap,
     ThemeKindProvider,
-} from './theme-interfaces';
+} from './theme-interfaces.js';
 export type { ProvideLang, ThemeFragmentMap, Color, Scale, SystemVariant };
 /**
  * @element sp-theme

tools/theme/test/theme-devmode.test.ts

@@ -14,7 +14,7 @@ import '@spectrum-web-components/theme/sp-theme.js';
 import { Theme } from '@spectrum-web-components/theme';
 import { elementUpdated, expect, fixture, html } from '@open-wc/testing';
 import { stub } from 'sinon';
-import { testForLitDevWarnings } from '../../../test/testing-helpers';
+import { testForLitDevWarnings } from '../../../test/testing-helpers.js';
 
 describe('Theme', () => {
     testForLitDevWarnings(

yarn.lock

@@ -5349,7 +5349,7 @@
   integrity sha512-rGfd7jqXOdR69bEjrRP58ynuIeJU0czPfwQvzhtCzg7jKVukV+efNHqrs086sC6xutB3W4TF71K/dZMr3oyTyg==
 
 "@spectrum-web-components/eslint-plugin@file:./linters/eslint":
-  version "0.47.2"
+  version "0.48.0"
 
 "@storybook/addon-a11y@^7.5.0":
   version "7.6.19"
@@ -12063,6 +12063,11 @@ eslint-plugin-prettier@^5.1.3:
     prettier-linter-helpers "^1.0.0"
     synckit "^0.8.6"
 
+eslint-plugin-require-extensions@^0.1.3:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-require-extensions/-/eslint-plugin-require-extensions-0.1.3.tgz#394aeab433f996797a6ceba0a3f75640d4846bc8"
+  integrity sha512-T3c1PZ9PIdI3hjV8LdunfYI8gj017UQjzAnCrxuo3wAjneDbTPHdE3oNWInOjMA+z/aBkUtlW5vC0YepYMZIug==
+
 eslint-plugin-storybook@^0.8.0:
   version "0.8.0"
   resolved "https://registry.yarnpkg.com/eslint-plugin-storybook/-/eslint-plugin-storybook-0.8.0.tgz#23185ecabdc289cae55248c090f0c1d8fbae6c41"