Update wasm-opt invocation defaults for debug builds

Author: thedodd

CHANGELOG.md

@@ -6,6 +6,10 @@ Subheadings to categorize changes are `added, changed, deprecated, removed, fixe
 
 ## Unreleased
 
+## 0.12.1
+### fixed
+- When wasm-opt level is not set explicitly, do not invoke it at all for debug builds, and for release builds invoke with default optimization level.
+
 ## 0.12.0
 ### added
 - Closed [#139](https://github.com/thedodd/trunk/issues/139): Download and manage external applications (namely `wasm-bindgen` and `wasm-opt`) automatically. If available in the right version, system installed binaries are used but if absent the right version is downloaded and installed. This allows to use trunk without the extra steps of downloading the needed binaries manually.

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "trunk"
-version = "0.12.0"
+version = "0.12.1"
 edition = "2018"
 description = "Build, bundle & ship your Rust WASM application to the web."
 license = "MIT/Apache-2.0"

Cargo.toml

@@ -72,7 +72,7 @@ impl RustApp {
             .get("data-wasm-opt")
             .map(|val| val.parse())
             .transpose()?
-            .unwrap_or_default();
+            .unwrap_or_else(|| if cfg.release { Default::default() } else { WasmOptLevel::Off });
         let manifest = CargoMetadata::new(&manifest_href).await?;
         let id = Some(id);