diff --git a/constraints.pro b/constraints.pro
index 8474011e..9b7b06c1 100644
--- a/constraints.pro
+++ b/constraints.pro
@@ -82,7 +82,7 @@ gen_enforced_field(WorkspaceCwd, 'exports["./package.json"]', './package.json').
 
 % The list of files included in the package must only include files generated
 % during the build step.
-gen_enforced_field(WorkspaceCwd, 'files', ['dist', 'stream-provider.js']).
+gen_enforced_field(WorkspaceCwd, 'files', ['dist', 'initializeInpageProvider.d.ts', 'initializeInpageProvider.js', 'stream-provider.js']).
 
 % If a dependency is listed under "dependencies", it should not be listed under
 % "devDependencies".
diff --git a/initializeInpageProvider.d.ts b/initializeInpageProvider.d.ts
new file mode 100644
index 00000000..3cf80c10
--- /dev/null
+++ b/initializeInpageProvider.d.ts
@@ -0,0 +1,5 @@
+/* eslint-disable import/extensions */
+
+// Re-exported for compatibility with build tools that don't support the
+// `exports` field in package.json
+export * from './dist/initializeInpageProvider.cjs';
diff --git a/initializeInpageProvider.js b/initializeInpageProvider.js
new file mode 100644
index 00000000..76b53ff4
--- /dev/null
+++ b/initializeInpageProvider.js
@@ -0,0 +1,5 @@
+/* eslint-disable import/extensions,import/no-unresolved */
+
+// Re-exported for compatibility with build tools that don't support the
+// `exports` field in package.json
+module.exports = require('./dist/initializeInpageProvider.cjs');
diff --git a/package.json b/package.json
index 3de8ccfc..0d24043b 100644
--- a/package.json
+++ b/package.json
@@ -49,9 +49,15 @@
         "default": "./dist/initializeInpageProvider.cjs"
       }
     },
-    "./dist/initializeInpageProvider.cjs": {
-      "types": "./dist/initializeInpageProvider.d.cts",
-      "default": "./dist/initializeInpageProvider.cjs"
+    "./initializeInpageProvider": {
+      "import": {
+        "types": "./dist/initializeInpageProvider.d.mts",
+        "default": "./dist/initializeInpageProvider.mjs"
+      },
+      "require": {
+        "types": "./dist/initializeInpageProvider.d.cts",
+        "default": "./dist/initializeInpageProvider.cjs"
+      }
     },
     "./stream-provider": {
       "import": {
@@ -70,6 +76,8 @@
   "types": "./dist/index.d.cts",
   "files": [
     "dist",
+    "initializeInpageProvider.d.ts",
+    "initializeInpageProvider.js",
     "stream-provider.js"
   ],
   "scripts": {