fix(runtime): support reading /proc using readFile (#12839)

1 files changed, 12 insertions, 3 deletions

diff --git a/runtime/js/40_read_file.js b/runtime/js/40_read_file.js
index 53ac9b08a..5e90b523a 100644
--- a/runtime/js/40_read_file.js
+++ b/runtime/js/40_read_file.js
@@ -4,13 +4,18 @@
 ((window) => {
   const core = window.Deno.core;
   const { open, openSync } = window.__bootstrap.files;
-  const { readAllSyncSized, readAllInnerSized } = window.__bootstrap.io;
+  const { readAllSync, readAll, readAllSyncSized, readAllInnerSized } =
+    window.__bootstrap.io;
 
   function readFileSync(path) {
     const file = openSync(path);
     try {
       const { size } = file.statSync();
-      return readAllSyncSized(file, size);
+      if (size === 0) {
+        return readAllSync(file);
+      } else {
+        return readAllSyncSized(file, size);
+      }
     } finally {
       file.close();
     }
@@ -20,7 +25,11 @@
     const file = await open(path);
     try {
       const { size } = await file.stat();
-      return await readAllInnerSized(file, size, options);
+      if (size === 0) {
+        return await readAll(file);
+      } else {
+        return await readAllInnerSized(file, size, options);
+      }
     } finally {
       file.close();
     }