1 files changed, 23 insertions, 21 deletions
diff --git a/std/examples/catj.ts b/std/examples/catj.ts
index 4329d27b1..3ef14ce0b 100644
--- a/std/examples/catj.ts
+++ b/std/examples/catj.ts
@@ -81,28 +81,30 @@ function print(data: any): void {
   }
 }
 
-const parsedArgs = parse(Deno.args);
-
-if (parsedArgs.h || parsedArgs.help || parsedArgs._.length === 0) {
-  console.log("Usage: catj [-h|--help] [file...]");
-  console.log();
-  console.log("Examples:");
-  console.log();
-  console.log("// print file:\n   catj file.json");
-  console.log();
-  console.log("// print multiple files:\n   catj file1.json file2.json");
-  console.log();
-  console.log("// print from stdin:\n   cat file.json | catj -");
-}
+if (import.meta.main) {
+  const parsedArgs = parse(Deno.args);
+
+  if (parsedArgs.h || parsedArgs.help || parsedArgs._.length === 0) {
+    console.log("Usage: catj [-h|--help] [file...]");
+    console.log();
+    console.log("Examples:");
+    console.log();
+    console.log("// print file:\n   catj file.json");
+    console.log();
+    console.log("// print multiple files:\n   catj file1.json file2.json");
+    console.log();
+    console.log("// print from stdin:\n   cat file.json | catj -");
+  }
 
-if (parsedArgs._[0] === "-") {
-  const contents = await Deno.readAll(Deno.stdin);
-  const json = JSON.parse(decoder.decode(contents));
-  print(json);
-} else {
-  for (const fileName of parsedArgs._) {
-    const fileContents = await Deno.readFile(fileName);
-    const json = JSON.parse(decoder.decode(fileContents));
+  if (parsedArgs._[0] === "-") {
+    const contents = await Deno.readAll(Deno.stdin);
+    const json = JSON.parse(decoder.decode(contents));
     print(json);
+  } else {
+    for (const fileName of parsedArgs._) {
+      const fileContents = await Deno.readFile(fileName.toString());
+      const json = JSON.parse(decoder.decode(fileContents));
+      print(json);
+    }
   }
 }