diff --git a/.yarn/versions/768bd0b5.yml b/.yarn/versions/768bd0b5.yml
new file mode 100644
index 000000000000..893012207750
--- /dev/null
+++ b/.yarn/versions/768bd0b5.yml
@@ -0,0 +1,12 @@
+releases:
+  "@yarnpkg/builder": patch
+
+declined:
+  - "@yarnpkg/plugin-constraints"
+  - "@yarnpkg/plugin-exec"
+  - "@yarnpkg/plugin-interactive-tools"
+  - "@yarnpkg/plugin-stage"
+  - "@yarnpkg/plugin-typescript"
+  - "@yarnpkg/plugin-version"
+  - "@yarnpkg/plugin-workspace-tools"
+  - "@yarnpkg/cli"
diff --git a/packages/yarnpkg-builder/sources/commands/build/bundle.ts b/packages/yarnpkg-builder/sources/commands/build/bundle.ts
index bb7ae1af36a3..eceb0065a9f8 100644
--- a/packages/yarnpkg-builder/sources/commands/build/bundle.ts
+++ b/packages/yarnpkg-builder/sources/commands/build/bundle.ts
@@ -133,6 +133,8 @@ export default class BuildBundleCommand extends Command {
             }),
           },
           outfile: output,
+          // Default extensions + .mjs
+          resolveExtensions: [`.tsx`, `.ts`, `.jsx`, `.mjs`, `.js`, `.css`, `.json`],
           logLevel: `silent`,
           format: `iife`,
           platform: `node`,
diff --git a/packages/yarnpkg-builder/sources/commands/build/plugin.ts b/packages/yarnpkg-builder/sources/commands/build/plugin.ts
index d790ff084761..1d0a3701d8fe 100644
--- a/packages/yarnpkg-builder/sources/commands/build/plugin.ts
+++ b/packages/yarnpkg-builder/sources/commands/build/plugin.ts
@@ -113,6 +113,8 @@ export default class BuildPluginCommand extends Command {
           entryPoints: [path.resolve(basedir, main ?? `sources/index`)],
           bundle: true,
           outfile: output,
+          // Default extensions + .mjs
+          resolveExtensions: [`.tsx`, `.ts`, `.jsx`, `.mjs`, `.js`, `.css`, `.json`],
           logLevel: `silent`,
           format: `iife`,
           platform: `node`,