fix: support windows absolute extends (#3062)

lib/get-config.js

@@ -1,10 +1,10 @@
-import { dirname, extname } from "node:path";
+import { dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 
 import { castArray, isNil, isPlainObject, isString, pickBy } from "lodash-es";
 import { readPackageUp } from "read-pkg-up";
 import { cosmiconfig } from "cosmiconfig";
-import resolveFrom from "resolve-from";
+import importFrom from "import-from-esm";
 import debugConfig from "debug";
 import { repoUrl } from "./git.js";
 import PLUGINS_DEFINITIONS from "./definitions/plugins.js";
@@ -33,17 +33,7 @@ export default async (context, cliOptions) => {
     options = {
       ...(await castArray(extendPaths).reduce(async (eventualResult, extendPath) => {
         const result = await eventualResult;
-        const resolvedPath = resolveFrom.silent(__dirname, extendPath) || resolveFrom(cwd, extendPath);
-        const importAssertions =
-          extname(resolvedPath) === ".json"
-            ? {
-                assert: {
-                  type: "json",
-                },
-              }
-            : undefined;
-
-        const { default: extendsOptions } = await import(resolvedPath, importAssertions);
+        const extendsOptions = (await importFrom.silent(__dirname, extendPath)) || (await importFrom(cwd, extendPath));
 
         // For each plugin defined in a shareable config, save in `pluginsPath` the extendable config path,
         // so those plugin will be loaded relative to the config file