diff --git a/WritableStream.js b/WritableStream.js
new file mode 100644
index 000000000..37ccdbf0f
--- /dev/null
+++ b/WritableStream.js
@@ -0,0 +1,3 @@
+// Make exports work in Node < 12
+// eslint-disable-next-line no-undef, unicorn/prefer-module
+module.exports = require("./dist/commonjs/WritableStream.js");
diff --git a/package.json b/package.json
index f83e8e22e..9cfd20479 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
                 "default": "./dist/commonjs/index.js"
             }
         },
-        "./dist/WritableStream": {
+        "./WritableStream": {
             "import": {
                 "source": "./src/WritableStream.ts",
                 "types": "./dist/esm/WritableStream.d.ts",
@@ -105,7 +105,7 @@
         ],
         "exports": {
             ".": "./src/index.ts",
-            "./dist/WritableStream": "./src/WritableStream.ts"
+            "./WritableStream": "./src/WritableStream.ts"
         }
     }
 }
diff --git a/tsconfig.json b/tsconfig.json
index 91a4aafcf..62e6a1e1b 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -14,6 +14,7 @@
         "exactOptionalPropertyTypes": true,
         "forceConsistentCasingInFileNames": true,
         "isolatedModules": true,
+        "isolatedDeclarations": true,
         "noFallthroughCasesInSwitch": true,
         "noImplicitOverride": true,
         "noImplicitReturns": true,