[ESM] support new experimental-loader format (#270)

* [ESM] getSource has been renamed load

* [ESM] It seems load was just introduced in 16.12.0 so we need to keep getSource for 14

Author: bjornstar

lib/index.js

@@ -99,8 +99,11 @@ module.exports = function (
         const resolveLoader = resolveMain(localPath('resolve-loader.mjs'));
         cmd.unshift('--experimental-modules', `--loader=${resolveLoader}`);
       } else if (semver.satisfies(process.version, '>=12.11.1')) {
-        const getSourceLoader = resolveMain(localPath('get-source-loader.mjs'));
-        cmd.unshift(`--experimental-loader=${getSourceLoader}`);
+        const loaderPath = semver.satisfies(process.version, '>=16.12.0')
+          ? 'load-loader.mjs'
+          : 'get-source-loader.mjs';
+        const experimentalLoader = resolveMain(localPath(loaderPath));
+        cmd.unshift(`--experimental-loader=${experimentalLoader}`);
       }
     }
 

lib/load-loader.mjs

@@ -0,0 +1,6 @@
+import { send } from './ipc.js';
+
+export async function load(url, context, defaultLoad) {
+  send({ required: new URL(url).pathname });
+  return defaultLoad(url, context, defaultLoad);
+}