Fix double newline using browser shim (bytecodealliance#502)

Signed-off-by: Jorge Prendes <[email protected]>
calvinrp · Sep 17, 2024 · 0bf599f · 0bf599f
1 parent 3435f0b
commit 0bf599f
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/packages/preview2-shim/lib/browser/cli.js b/packages/preview2-shim/lib/browser/cli.js
@@ -75,6 +75,10 @@ const stdinStream = new InputStream({
 let textDecoder = new TextDecoder();
 const stdoutStream = new OutputStream({
   write (contents) {
+    if (contents[contents.length - 1] == 10) {
+      // console.log already appends a new line
+      contents = contents.subarray(0, contents.length - 1);
+    }
     console.log(textDecoder.decode(contents));
   },
   blockingFlush () {
@@ -84,10 +88,13 @@ const stdoutStream = new OutputStream({
 });
 const stderrStream = new OutputStream({
   write (contents) {
+    if (contents[contents.length - 1] == 10) {
+      // console.error already appends a new line
+      contents = contents.subarray(0, contents.length - 1);
+    }
     console.error(textDecoder.decode(contents));
   },
   blockingFlush () {
-
   },
   [symbolDispose] () {