From 4de3c01c49a400b98dfde1e375ba3e091f85641b Mon Sep 17 00:00:00 2001
From: Neil Shapiro <nshapiro@slack-corp.com>
Date: Wed, 18 May 2022 14:24:26 -0700
Subject: [PATCH] Add error message to catch if Deno.emit isn't a valid
 function (#19)

---
 src/functions.ts | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/src/functions.ts b/src/functions.ts
index 61cbf1a..d344713 100644
--- a/src/functions.ts
+++ b/src/functions.ts
@@ -84,11 +84,19 @@ const createFunctionFile = async (
     isImportMapPresent = false;
   }
 
-  const result = await Deno.emit(fnFilePath, {
-    bundle: "module",
-    check: false,
-    importMapPath: isImportMapPresent ? importMapPath : undefined,
-  });
+  let result;
+  try {
+    result = await Deno.emit(fnFilePath, {
+      bundle: "module",
+      check: false,
+      importMapPath: isImportMapPresent ? importMapPath : undefined,
+    });
+  } catch (e) {
+    console.log(
+      "This is likely due to the newest versions of Deno no longer supporting Deno.emit(). Please downgrade your version of Deno to 1.21.3",
+    );
+    throw new Error(e);
+  }
 
   // Write FN File and sourcemap file
   const fnFileRelative = path.join("functions", `${fnId}.js`);