diff --git a/.circleci/config.yml b/.circleci/config.yml
index b9e9664de9f39..ccac6da135ef7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -761,7 +761,8 @@ jobs:
             other.test_js_optimizer_verbose
             other.test_node_unhandled_rejection
             other.test_full_js_library*
-            core2.test_hello_world"
+            core2.test_hello_world
+            core2.test_fs_write_rawfs"
       # Run a few test with the most recent version of node
       # In particular we have some tests that require node flags on older
       # versions of node but not with the most recent version.
diff --git a/src/library_fs_shared.js b/src/library_fs_shared.js
index 2bd91f44bb114..47c8b313e727f 100644
--- a/src/library_fs_shared.js
+++ b/src/library_fs_shared.js
@@ -134,7 +134,7 @@ addToLibrary({
         var fd = process.stdin.fd;
 
         try {
-          bytesRead = fs.readSync(fd, buf);
+          bytesRead = fs.readSync(fd, buf, 0, BUFSIZE);
         } catch(e) {
           // Cross-platform differences: on Windows, reading EOF throws an exception, but on other OSes,
           // reading EOF returns 0. Uniformize behavior by treating the EOF exception to return 0.
diff --git a/src/library_nodefs.js b/src/library_nodefs.js
index ace50458c9c43..7f5b990a88a96 100644
--- a/src/library_nodefs.js
+++ b/src/library_nodefs.js
@@ -276,14 +276,14 @@ addToLibrary({
         // Node.js < 6 compatibility: node errors on 0 length reads
         if (length === 0) return 0;
         try {
-          return fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), { position: position });
+          return fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position);
         } catch (e) {
           throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
         }
       },
       write(stream, buffer, offset, length, position) {
         try {
-          return fs.writeSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), { position: position });
+          return fs.writeSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position);
         } catch (e) {
           throw new FS.ErrnoError(NODEFS.convertNodeCode(e));
         }
diff --git a/src/library_noderawfs.js b/src/library_noderawfs.js
index 8f9df71a71498..105fb312bd572 100644
--- a/src/library_noderawfs.js
+++ b/src/library_noderawfs.js
@@ -149,7 +149,7 @@ addToLibrary({
       }
       var seeking = typeof position != 'undefined';
       if (!seeking && stream.seekable) position = stream.position;
-      var bytesRead = fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), { position: position });
+      var bytesRead = fs.readSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position);
       // update position marker when non-seeking
       if (!seeking) stream.position += bytesRead;
       return bytesRead;
@@ -165,7 +165,7 @@ addToLibrary({
       }
       var seeking = typeof position != 'undefined';
       if (!seeking && stream.seekable) position = stream.position;
-      var bytesWritten = fs.writeSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), { position: position });
+      var bytesWritten = fs.writeSync(stream.nfd, new Int8Array(buffer.buffer, offset, length), 0, length, position);
       // update position marker when non-seeking
       if (!seeking) stream.position += bytesWritten;
       return bytesWritten;
diff --git a/src/library_wasmfs_node.js b/src/library_wasmfs_node.js
index 5a0303362b022..a23b4b3e2273e 100644
--- a/src/library_wasmfs_node.js
+++ b/src/library_wasmfs_node.js
@@ -188,7 +188,7 @@ addToLibrary({
     try {
       // TODO: Cache open file descriptors to guarantee that opened files will
       // still exist when we try to access them.
-      let nread = fs.readSync(fd, new Int8Array(HEAPU8.buffer, buf_p, len), { position: pos });
+      let nread = fs.readSync(fd, new Int8Array(HEAPU8.buffer, buf_p, len), 0, len, pos);
       {{{ makeSetValue('nread_p', 0, 'nread', 'i32') }}};
     } catch (e) {
       if (!e.code) throw e;
@@ -202,7 +202,7 @@ addToLibrary({
     try {
       // TODO: Cache open file descriptors to guarantee that opened files will
       // still exist when we try to access them.
-      let nwritten = fs.writeSync(fd, new Int8Array(HEAPU8.buffer, buf_p, len), { position: pos });
+      let nwritten = fs.writeSync(fd, new Int8Array(HEAPU8.buffer, buf_p, len), 0, len, pos);
       {{{ makeSetValue('nwritten_p', 0, 'nwritten', 'i32') }}};
     } catch (e) {
       if (!e.code) throw e;
diff --git a/test/fs/test_write.cpp b/test/fs/test_write.cpp
index c0467fcfa8089..d6e0f206c7d5d 100644
--- a/test/fs/test_write.cpp
+++ b/test/fs/test_write.cpp
@@ -24,7 +24,7 @@ int main()
         var pos = lengthBytesUTF8(str);
 
         str = '1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890';
-        data = new Uint8Array(100);
+        data = new Uint8Array(str.length+1);
         stringToUTF8Array(str, data, 0, lengthBytesUTF8(str)+1);
         FS.write(stream, data, 0, lengthBytesUTF8(str)+1, pos, /*canOwn=*/false);
 
diff --git a/test/test_core.py b/test/test_core.py
index 7eda33e4c5187..7ba98ebe21337 100644
--- a/test/test_core.py
+++ b/test/test_core.py
@@ -5822,6 +5822,7 @@ def test_fs_js_api(self):
     self.set_setting("FORCE_FILESYSTEM")
     self.do_runf('fs/test_fs_js_api.c', 'success')
 
+  @also_with_noderawfs
   def test_fs_write(self):
     if self.get_setting('WASMFS'):
       self.set_setting("FORCE_FILESYSTEM")
diff --git a/third_party/closure-compiler/node-externs/fs.js b/third_party/closure-compiler/node-externs/fs.js
index 4e7e95831fc7b..fc9cce32fa8f9 100644
--- a/third_party/closure-compiler/node-externs/fs.js
+++ b/third_party/closure-compiler/node-externs/fs.js
@@ -373,10 +373,12 @@ fs.write = function(fd, buffer, offset, length, position, callback) {};
 /**
  * @param {*} fd
  * @param {*} buffer
- * @param {Object.<string,number>=} options
+ * @param {number=} offset
+ * @param {number=} length
+ * @param {number=} position
  * @return {number}
  */
-fs.writeSync = function(fd, buffer, options) {};
+fs.writeSync = function(fd, buffer, offset, length, position) {};
 
 /**
  * @param {*} fd
@@ -391,11 +393,13 @@ fs.read = function(fd, buffer, offset, length, position, callback) {};
 /**
  * @param {*} fd
  * @param {*} buffer
- * @param {Object.<string,number>=} options
+ * @param {number} offset
+ * @param {number} length
+ * @param {number=} position
  * @return {number}
  * @nosideeffects
  */
-fs.readSync = function(fd, buffer, options) {};
+fs.readSync = function(fd, buffer, offset, length, position) {};
 
 /**
  * @param {string} filename