diff --git a/packages/core/compile.entry.js b/packages/core/compile.entry.ts
similarity index 100%
rename from packages/core/compile.entry.js
rename to packages/core/compile.entry.ts
diff --git a/packages/core/compile.js b/packages/core/compile.js
index ca226eb94..113b0f1f5 100644
--- a/packages/core/compile.js
+++ b/packages/core/compile.js
@@ -1,5 +1,5 @@
 /**
- * this is used to point to the right source when development with workspaces
+ * This entry is for old runtimes which do not support `exports` field in package.json
+ * https://github.com/facebook/metro/issues/670
  */
-// eslint-disable-next-line import/no-unresolved
-export * from "./build/compile"
+module.exports = require("./build/cjs/compile.js")
diff --git a/packages/core/npm/compile.js b/packages/core/npm/compile.js
deleted file mode 100644
index bce147372..000000000
--- a/packages/core/npm/compile.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./cjs/compile.js")
diff --git a/packages/core/npm/index.js b/packages/core/npm/index.js
deleted file mode 100644
index 0ff2fc8f8..000000000
--- a/packages/core/npm/index.js
+++ /dev/null
@@ -1 +0,0 @@
-module.exports = require("./cjs/index.js")
diff --git a/packages/core/package.json b/packages/core/package.json
index 17d3f0dd1..cf2ad8abf 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -43,7 +43,8 @@
   "files": [
     "LICENSE",
     "README.md",
-    "build/"
+    "build/",
+    "compile.js"
   ],
   "dependencies": {
     "@babel/runtime": "^7.11.2",
diff --git a/scripts/build/bundles.ts b/scripts/build/bundles.ts
index 19564bb8e..d997a1667 100644
--- a/scripts/build/bundles.ts
+++ b/scripts/build/bundles.ts
@@ -32,7 +32,7 @@ export const bundles: readonly BundleDef[] = [
   {
     type: BundleType.UNIVERSAL,
     packageName: "core",
-    entry: 'compile.entry.js',
+    entry: 'compile.entry.ts',
     label: 'compile',
   },
   {