some fixes to node-wasi

node-wasi-sassc.patch

diff --git a/run.js b/run.js
index 87928f1..94f353d 100755
--- a/run.js
+++ b/run.js
@@ -30,9 +30,11 @@ USAGE:
 const bin = fs.readFileSync(process.argv[2]);
 
 const mod = new WebAssembly.Module(bin);
+const preopenDirectories = {};
+preopenDirectories[process.cwd()] = process.cwd();
 
 const wasi = new WASI({
-  preopenDirectories: { '.': '.' },
+  preopenDirectories,
   env: process.env,
   args: process.argv.slice(2),
 });
diff --git a/src/index.js b/src/index.js
index cc9b597..75dcd1f 100644
--- a/src/index.js
+++ b/src/index.js
@@ -442,6 +442,27 @@ const wrap = (f) => (...args) => {
   }
 };
 
+const getFiletype = (stats) => {
+  switch (true) {
+    case stats.isBlockDevice():
+      return WASI_FILETYPE_BLOCK_DEVICE;
+    case stats.isCharacterDevice():
+      return filetype = WASI_FILETYPE_CHARACTER_DEVICE;
+    case stats.isDirectory():
+      return WASI_FILETYPE_DIRECTORY;
+    case stats.isFIFO():
+      return WASI_FILETYPE_SOCKET_STREAM;
+    case stats.isFile():
+      return WASI_FILETYPE_REGULAR_FILE;
+    case stats.isSocket():
+      return WASI_FILETYPE_SOCKET_STREAM;
+    case stats.isSymbolicLink():
+      return WASI_FILETYPE_SYMBOLIC_LINK;
+    default:
+      return WASI_FILETYPE_UNKNOWN;
+  }
+};
+
 const stat = (wasi, fd) => {
   const entry = wasi.FD_MAP.get(fd);
   if (!entry) {
@@ -599,7 +620,7 @@ class WASI {
         let coffset = environ;
         let offset = environBuf;
         const envProcessed = Object.entries(env)
-          .map(([key, value]) => `${key}=${value}`);
+          .map(([key, value]) => `${key}=${value}\0`);
         envProcessed.forEach((e) => {
           this.view.setUint32(coffset, offset, true);
           coffset += 4;
@@ -612,7 +633,7 @@ class WASI {
         const envProcessed = Object.entries(env)
           .map(([key, value]) => `${key}=${value}`);
         const size = envProcessed.reduce((acc, e) =>
-          acc + Buffer.byteLength(e), 0);
+          acc + Buffer.byteLength(e) + 1, 0);
         this.view.setUint32(environCount, envProcessed.length, true);
         this.view.setUint32(environBufSize, size, true);
         return WASI_ESUCCESS;
@@ -917,7 +938,7 @@ class WASI {
         bufPtr += 8;
         this.view.setBigUint64(bufPtr, BigInt(rstats.ino), true);
         bufPtr += 8;
-        this.view.setUint8(bufPtr, stats.filetype);
+        this.view.setUint8(bufPtr, getFiletype(rstats));
         bufPtr += 4;
         this.view.setUint32(bufPtr, Number(rstats.nlink), true);
         bufPtr += 4;