Use file extensions in web-features package type declarations

eslint.config.js

@@ -1,21 +1,26 @@
 import newWithError from "eslint-plugin-new-with-error";
+import { defineConfig, globalIgnores } from "eslint/config";
 import tseslint from "typescript-eslint";
 
-export default tseslint.config(tseslint.configs.base, {
-  plugins: { newWithError },
-  rules: {
-    "@typescript-eslint/no-unused-vars": [
-      "error",
-      {
-        caughtErrors: "none",
-      },
-    ],
-    "newWithError/new-with-error": "error",
-    "no-duplicate-imports": "error",
-    "no-throw-literal": "error",
+export default defineConfig(
+  tseslint.configs.base,
+  {
+    plugins: { newWithError },
+    rules: {
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          caughtErrors: "none",
+        },
+      ],
+      "newWithError/new-with-error": "error",
+      "no-duplicate-imports": "error",
+      "no-throw-literal": "error",
+    },
+    files: ["**/*.ts"],
   },
-  files: ["**/*.ts"],
-});
+  globalIgnores(["packages/web-features/**/*.js"]),
+);
 
 // TODO: do linting more comprehensively, something like:
 // import eslint from "@eslint/js";

packages/web-features/index.ts

@@ -1,7 +1,7 @@
 import { readFileSync } from "node:fs";
 import { fileURLToPath } from "node:url";
 
-import { WebFeaturesData } from "./types";
+import { WebFeaturesData } from "./types.js";
 
 const jsonPath = fileURLToPath(new URL("./data.json", import.meta.url));
 const { browsers, features, groups, snapshots } = JSON.parse(

packages/web-features/tsconfig.json

@@ -1,8 +1,8 @@
 {
   "compilerOptions": {
     "target": "ES2016",
-    "module": "ESNext",
-    "moduleResolution": "Bundler",
+    "module": "nodenext",
+    "moduleResolution": "nodenext",
     "typeRoots": ["./node_modules/@types"],
     "declaration": true
   }

types.ts

@@ -18,7 +18,7 @@ import type {
   Release,
   SnapshotData,
   Support,
-} from "./types.quicktype";
+} from "./types.quicktype.js";
 
 // Passthrough types
 export type {