From b5a1b0d90f947524923a2a5ae293c257731e35ee Mon Sep 17 00:00:00 2001
From: Andrew Jones <ascjones@gmail.com>
Date: Tue, 30 Mar 2021 12:16:49 +0100
Subject: [PATCH] Check wasm optimized output file exists (#243)

* Check wasm optimized output file exists

* Fmt

* Add expected optimized file to error

* Use display for path
---
 src/cmd/build.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/cmd/build.rs b/src/cmd/build.rs
index fac09452d..f2e9bb036 100644
--- a/src/cmd/build.rs
+++ b/src/cmd/build.rs
@@ -317,6 +317,13 @@ fn optimize_wasm(
         optimization_passes,
     )?;
 
+    if !dest_optimized.exists() {
+        return Err(anyhow::anyhow!(
+            "Optimization failed, optimized wasm output file `{}` not found.",
+            dest_optimized.display()
+        ));
+    }
+
     let original_size = metadata(&crate_metadata.dest_wasm)?.len() as f64 / 1000.0;
     let optimized_size = metadata(&dest_optimized)?.len() as f64 / 1000.0;