Fix: Enable keep_fn_names In SWC Mangling (#3539)

* fix: swc, keep fn name

* fix: don't update swc

packages/cli-opt/Cargo.toml

@@ -39,7 +39,7 @@ grass = "0.13.4"
 codemap = "0.1.3"
 
 # Js minification - swc has introduces minor versions with breaking changes in the past so we pin all of their crates
-swc = "=0.283.0"
+swc = "=0.285.0"
 swc_allocator = { version = "=0.1.8", default-features = false }
 swc_atoms = { version = "=0.6.7", default-features = false }
 swc_cached = { version = "=0.3.20", default-features = false }
@@ -92,4 +92,4 @@ swc_trace_macro = { version = "=0.1.3", default-features = false }
 swc_transform_common = { version = "=0.1.1", default-features = false }
 swc_typescript = { version = "=0.5.0", default-features = false }
 swc_visit = { version = "=0.6.2", default-features = false }
-browserslist-rs = { version = "=0.16.0" }
+browserslist-rs = { version = "=0.16.0" }

packages/cli-opt/src/js.rs

@@ -4,9 +4,10 @@ use std::sync::Arc;
 
 use anyhow::Context;
 use manganis_core::JsAssetOptions;
-use swc::{config::JsMinifyOptions, try_with_handler, BoolOrDataConfig};
+use swc::{config::JsMinifyOptions, try_with_handler, BoolOrDataConfig, JsMinifyExtras};
 use swc_common::{sync::Lrc, FileName};
 use swc_common::{SourceMap, GLOBALS};
+use swc_ecma_minifier::option::MangleOptions;
 
 pub(crate) fn minify_js(source: &Path) -> anyhow::Result<String> {
     let mut source_file = std::fs::File::open(source)?;
@@ -26,9 +27,13 @@ pub(crate) fn minify_js(source: &Path) -> anyhow::Result<String> {
                     handler,
                     &JsMinifyOptions {
                         compress: BoolOrDataConfig::from_bool(true),
-                        mangle: BoolOrDataConfig::from_bool(true),
+                        mangle: BoolOrDataConfig::from_obj(MangleOptions {
+                            keep_fn_names: true,
+                            ..Default::default()
+                        }),
                         ..Default::default()
                     },
+                    JsMinifyExtras::default(),
                 )
                 .context("failed to minify javascript")
             })