refactor(next-swc): Do not amend minifier options from Rust code (#78719)

### What?

Remove Rust-side amending logic for minifier options and move all configuration to JS side

### Why?

x-ref: https://vercel.slack.com/archives/C04KC8A53T7/p1746034154828369?thread_ts=1746024368.021439&cid=C04KC8A53T7

### How?

Author: kdy1

crates/napi/src/minify.rs

@@ -30,20 +30,16 @@ use napi::bindgen_prelude::*;
 use rustc_hash::FxHashMap;
 use serde::Deserialize;
 use swc_core::{
-    base::{config::JsMinifyOptions, try_with_handler, BoolOrDataConfig, TransformOutput},
+    base::{config::JsMinifyOptions, try_with_handler, TransformOutput},
     common::{errors::ColorConfig, sync::Lrc, FileName, SourceFile, SourceMap, GLOBALS},
-    ecma::minifier::option::{
-        terser::{TerserCompressorOptions, TerserInlineOption},
-        MangleOptions,
-    },
 };
 
 use crate::{get_compiler, util::MapErr};
 
 pub struct MinifyTask {
     c: swc_core::base::Compiler,
     code: MinifyTarget,
-    opts: swc_core::base::config::JsMinifyOptions,
+    opts: JsMinifyOptions,
 }
 
 #[derive(Deserialize)]
@@ -104,43 +100,14 @@ impl Task for MinifyTask {
     }
 }
 
-/// **NOTE** `inline: 3` breaks some codes.
-///
-/// <https://github.com/vercel/next.js/pull/57904>
-fn patch_opts(opts: &mut JsMinifyOptions) {
-    opts.compress = BoolOrDataConfig::from_obj(TerserCompressorOptions {
-        inline: Some(TerserInlineOption::Num(2)),
-        global_defs: [(
-            "process.env.__NEXT_PRIVATE_MINIMIZE_MACRO_FALSE".into(),
-            false.into(),
-        )]
-        .iter()
-        .cloned()
-        .collect(),
-        ..Default::default()
-    });
-
-    if !opts.mangle.is_false() {
-        let mut mangle = std::mem::take(&mut opts.mangle);
-        if mangle.is_true() {
-            mangle = BoolOrDataConfig::from_obj(MangleOptions::default());
-        }
-        opts.mangle = mangle.map(|mut mangle_opts| {
-            mangle_opts.reserved.push("AbortSignal".into());
-            mangle_opts
-        });
-    }
-}
-
 #[napi]
 pub fn minify(
     input: Buffer,
     opts: Buffer,
     signal: Option<AbortSignal>,
 ) -> napi::Result<AsyncTask<MinifyTask>> {
     let code = serde_json::from_slice(&input)?;
-    let mut opts = serde_json::from_slice(&opts)?;
-    patch_opts(&mut opts);
+    let opts = serde_json::from_slice(&opts)?;
 
     let c = get_compiler();
 
@@ -152,8 +119,7 @@ pub fn minify(
 #[napi]
 pub fn minify_sync(input: Buffer, opts: Buffer) -> napi::Result<TransformOutput> {
     let code: MinifyTarget = serde_json::from_slice(&input)?;
-    let mut opts = serde_json::from_slice(&opts)?;
-    patch_opts(&mut opts);
+    let opts = serde_json::from_slice(&opts)?;
 
     let c = get_compiler();
 

packages/next/src/build/webpack/plugins/minify-webpack-plugin/src/index.ts

@@ -52,6 +52,7 @@ export class MinifyPlugin {
     const mangle = this.options.noMangling
       ? false
       : {
+          reserved: ['AbortSignal'],
           disableCharFreq: !!this.options.disableCharFreq,
         }
     const compilationSpan =
@@ -139,9 +140,12 @@ export class MinifyPlugin {
                     },
                   }
                 : {}),
-              // Compress options are defined in crates/napi/src/minify.rs.
-              compress: false,
-              // Mangle options may be amended in crates/napi/src/minify.rs.
+              compress: {
+                inline: 2,
+                global_defs: {
+                  'process.env.__NEXT_PRIVATE_MINIMIZE_MACRO_FALSE': false,
+                },
+              },
               mangle,
               module: 'unknown',
               output: {