Support extending ESM based configurations (#3037)

Co-authored-by: Matt Travi <programmer@travi.org>

lib/get-config.js

@@ -1,6 +1,5 @@
-import { dirname, resolve } from "node:path";
+import { dirname, extname } from "node:path";
 import { fileURLToPath } from "node:url";
-import { createRequire } from "node:module";
 
 import { castArray, isNil, isPlainObject, isString, pickBy } from "lodash-es";
 import { readPackageUp } from "read-pkg-up";
@@ -14,7 +13,6 @@ import { parseConfig, validatePlugin } from "./plugins/utils.js";
 
 const debug = debugConfig("semantic-release:config");
 const __dirname = dirname(fileURLToPath(import.meta.url));
-const require = createRequire(import.meta.url);
 
 const CONFIG_NAME = "release";
 
@@ -35,7 +33,17 @@ export default async (context, cliOptions) => {
     options = {
       ...(await castArray(extendPaths).reduce(async (eventualResult, extendPath) => {
         const result = await eventualResult;
-        const extendsOptions = require(resolveFrom.silent(__dirname, extendPath) || resolveFrom(cwd, extendPath));
+        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);
 
         // 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