refactor(es/minifier): Cleanup (#4489)

crates/swc_ecma_minifier/scripts/next/start.sh

@@ -41,8 +41,8 @@ echo "----- ⚠️  Removing cache"
 (cd $dir && rm -rf .next)
 
 echo "----- ⚠️  Replacing swc binary"
-cp packages/next-swc/native/*.node $dir/node_modules/@next/swc-*/
+mv packages/next-swc/native/*.node $dir/node_modules/@next/swc-*/
-ls -al $dir/node_modules/@next/swc-*/
+ls -alh $dir/node_modules/@next/swc-*/
 
 # Build and start
 echo "----- ⚠️  Building the app using next"

crates/swc_ecma_minifier/src/compress/mod.rs

@@ -24,7 +24,7 @@ use swc_ecma_visit::{as_folder, noop_visit_mut_type, VisitMut, VisitMutWith, Vis
 use swc_timer::timer;
 use tracing::{debug, error};
 
-pub(crate) use self::pure::pure_optimizer;
+pub(crate) use self::pure::{pure_optimizer, PureOptimizerConfig};
 use self::{hoist_decls::DeclHoisterConfig, optimize::optimizer};
 use crate::{
     analyzer::{analyze, UsageAnalyzer},
@@ -319,9 +319,11 @@ where
                 self.options,
                 None,
                 self.marks,
-                M::force_str_for_tpl(),
+                PureOptimizerConfig {
-                self.pass > 1,
+                    enable_join_vars: self.pass > 1,
-                self.pass >= 20,
+                    force_str_for_tpl: M::force_str_for_tpl(),
+                    debug_infinite_loop: self.pass >= 20,
+                },
             );
             n.apply(&mut visitor);
 

crates/swc_ecma_minifier/src/compress/optimize/mod.rs

@@ -1,6 +1,3 @@
-#![allow(dead_code)]
-#![allow(unused_imports)]
-
 use std::{iter::once, mem::take};
 
 use retain_mut::RetainMut;
@@ -98,6 +95,7 @@ struct Ctx {
     skip_standalone: bool,
 
     /// `true` if the [VarDecl] has const annotation.
+    #[allow(dead_code)]
     has_const_ann: bool,
 
     in_bool_ctx: bool,
@@ -149,13 +147,12 @@ struct Ctx {
 
     in_obj_of_non_computed_member: bool,
 
+    #[allow(dead_code)]
     in_tpl_expr: bool,
 
     /// True while handling callee, except an arrow expression in callee.
     is_this_aware_callee: bool,
 
-    can_inline_arguments: bool,
-
     is_nested_if_return_merging: bool,
 
     dont_invoke_iife: bool,
@@ -1458,10 +1455,7 @@ where
     fn visit_mut_arrow_expr(&mut self, n: &mut ArrowExpr) {
         let prepend = self.prepend_stmts.take();
 
-        let ctx = Ctx {
+        let ctx = Ctx { ..self.ctx };
-            can_inline_arguments: true,
-            ..self.ctx
-        };
 
         n.visit_mut_children_with(&mut *self.with_ctx(ctx));
 
@@ -2010,7 +2004,6 @@ where
                 skip_standalone: self.ctx.skip_standalone || is_standalone,
                 in_fn_like: true,
                 scope: n.span.ctxt,
-                can_inline_arguments: true,
                 top_level: false,
 
                 ..self.ctx
@@ -2033,10 +2026,7 @@ where
         }
 
         {
-            let ctx = Ctx {
+            let ctx = Ctx { ..self.ctx };
-                can_inline_arguments: true,
-                ..self.ctx
-            };
             self.with_ctx(ctx).optimize_usage_of_arguments(n);
         }
 

crates/swc_ecma_minifier/src/compress/optimize/util.rs

@@ -1,10 +1,9 @@
 use std::ops::{Deref, DerefMut};
 
 use rustc_hash::FxHashMap;
-use swc_atoms::JsWord;
 use swc_common::{Span, SyntaxContext};
 use swc_ecma_ast::*;
-use swc_ecma_utils::{ident::IdentLike, prop_name_eq, ExprExt, Id};
+use swc_ecma_utils::{ident::IdentLike, ExprExt, Id};
 use swc_ecma_visit::{noop_visit_mut_type, VisitMut, VisitMutWith};
 use tracing::debug;
 
@@ -15,48 +14,6 @@ impl<'b, M> Optimizer<'b, M>
 where
     M: Mode,
 {
-    pub(super) fn access_property<'e>(
-        &mut self,
-        expr: &'e mut Expr,
-        prop: &JsWord,
-    ) -> Option<&'e mut Expr> {
-        if let Expr::Object(obj) = expr {
-            for obj_prop in obj.props.iter_mut() {
-                match obj_prop {
-                    PropOrSpread::Spread(_) => {}
-                    PropOrSpread::Prop(p) => match &mut **p {
-                        Prop::Shorthand(_) => {}
-                        Prop::KeyValue(p) => {
-                            if prop_name_eq(&p.key, prop) {
-                                return Some(&mut *p.value);
-                            }
-                        }
-                        Prop::Assign(_) => {}
-                        Prop::Getter(_) => {}
-                        Prop::Setter(_) => {}
-                        Prop::Method(_) => {}
-                    },
-                }
-            }
-        }
-
-        None
-    }
-
-    pub(super) fn access_property_with_prop_name<'e>(
-        &mut self,
-        expr: &'e mut Expr,
-        prop: &PropName,
-    ) -> Option<&'e mut Expr> {
-        match prop {
-            PropName::Ident(p) => self.access_property(expr, &p.sym),
-            PropName::Str(p) => self.access_property(expr, &p.value),
-            PropName::Num(p) => self.access_numeric_property(expr, p.value as _),
-            PropName::Computed(_) => None,
-            PropName::BigInt(_) => None,
-        }
-    }
-
     pub(super) fn access_numeric_property<'e>(
         &mut self,
         _expr: &'e mut Expr,

crates/swc_ecma_minifier/src/compress/pure/ctx.rs

@@ -4,9 +4,6 @@ use super::Pure;
 
 #[derive(Default, Clone, Copy)]
 pub(super) struct Ctx {
-    /// This is actually config, but stored here.
-    pub force_str_for_tpl: bool,
-
     pub par_depth: u8,
 
     pub in_delete: bool,

crates/swc_ecma_minifier/src/compress/pure/mod.rs

@@ -34,40 +34,44 @@ mod strings;
 mod unsafes;
 mod vars;
 
+#[derive(Debug, Clone, Copy)]
+pub(crate) struct PureOptimizerConfig {
+    /// pass > 1
+    pub enable_join_vars: bool,
+
+    pub force_str_for_tpl: bool,
+    pub debug_infinite_loop: bool,
+}
+
 #[allow(clippy::needless_lifetimes)]
 pub(crate) fn pure_optimizer<'a>(
     options: &'a CompressOptions,
     data: Option<&'a ProgramData>,
     marks: Marks,
-    force_str_for_tpl: bool,
+    config: PureOptimizerConfig,
-    enable_everything: bool,
-    debug_infinite_loop: bool,
 ) -> impl 'a + VisitMut + Repeated {
     Pure {
         options,
+        config,
         marks,
         data,
         ctx: Ctx {
-            force_str_for_tpl,
             top_level: true,
             ..Default::default()
         },
         changed: Default::default(),
-        enable_everything,
-        debug_infinite_loop,
     }
 }
 
 struct Pure<'a> {
     options: &'a CompressOptions,
+    config: PureOptimizerConfig,
     marks: Marks,
+
     #[allow(unused)]
     data: Option<&'a ProgramData>,
     ctx: Ctx,
     changed: bool,
-    enable_everything: bool,
-
-    debug_infinite_loop: bool,
 }
 
 impl Repeated for Pure<'_> {
@@ -114,7 +118,7 @@ impl Pure<'_> {
             stmts.visit_with(&mut AssertValid);
         }
 
-        if self.enable_everything {
+        if self.config.enable_join_vars {
             self.join_vars(stmts);
 
             if cfg!(debug_assertions) {
@@ -595,7 +599,7 @@ impl VisitMut for Pure<'_> {
     }
 
     fn visit_mut_stmt(&mut self, s: &mut Stmt) {
-        let _tracing = if cfg!(feature = "debug") && self.debug_infinite_loop {
+        let _tracing = if cfg!(feature = "debug") && self.config.debug_infinite_loop {
             let text = dump(&*s, false);
 
             if text.lines().count() < 10 {
@@ -618,7 +622,7 @@ impl VisitMut for Pure<'_> {
             s.visit_mut_children_with(&mut *self.with_ctx(ctx));
         }
 
-        if cfg!(feature = "debug") && self.debug_infinite_loop {
+        if cfg!(feature = "debug") && self.config.debug_infinite_loop {
             let text = dump(&*s, false);
 
             if text.lines().count() < 10 {
@@ -652,7 +656,7 @@ impl VisitMut for Pure<'_> {
             }
         }
 
-        if cfg!(feature = "debug") && self.debug_infinite_loop {
+        if cfg!(feature = "debug") && self.config.debug_infinite_loop {
             let text = dump(&*s, false);
 
             if text.lines().count() < 10 {

crates/swc_ecma_minifier/src/compress/pure/strings.rs

@@ -193,9 +193,10 @@ impl Pure<'_> {
 
                 if c.chars().all(|c| match c {
                     '\u{0020}'..='\u{007e}' => true,
-                    '\n' | '\r' => self.ctx.force_str_for_tpl,
+                    '\n' | '\r' => self.config.force_str_for_tpl,
                     _ => false,
-                }) && (self.ctx.force_str_for_tpl || (!c.contains("\\n") && !c.contains("\\r")))
+                }) && (self.config.force_str_for_tpl
+                    || (!c.contains("\\n") && !c.contains("\\r")))
                     && !c.contains("\\0")
                     && !c.contains("\\x")
                 {

crates/swc_ecma_minifier/src/eval.rs

@@ -9,7 +9,7 @@ use swc_ecma_utils::{ident::IdentLike, undefined, ExprExt, Id};
 use swc_ecma_visit::{FoldWith, VisitMutWith};
 
 use crate::{
-    compress::{compressor, pure_optimizer},
+    compress::{compressor, pure_optimizer, PureOptimizerConfig},
     marks::Marks,
     mode::Mode,
 };
@@ -227,9 +227,11 @@ impl Evaluator {
                 &serde_json::from_str("{}").unwrap(),
                 None,
                 self.marks,
-                Eval::force_str_for_tpl(),
+                PureOptimizerConfig {
-                true,
+                    enable_join_vars: false,
-                false,
+                    force_str_for_tpl: Eval::force_str_for_tpl(),
+                    debug_infinite_loop: false,
+                },
             ));
         }
 

crates/swc_ecma_minifier/src/lib.rs

@@ -26,7 +26,7 @@
 #![allow(clippy::logic_bug)]
 #![allow(unstable_name_collisions)]
 
-use compress::pure_optimizer;
+use compress::{pure_optimizer, PureOptimizerConfig};
 use mode::Mode;
 use swc_common::{comments::Comments, pass::Repeat, sync::Lrc, SourceMap, GLOBALS};
 use swc_ecma_ast::Module;
@@ -153,9 +153,11 @@ pub fn optimize(
             options,
             None,
             marks,
-            Minification::force_str_for_tpl(),
+            PureOptimizerConfig {
-            true,
+                force_str_for_tpl: Minification::force_str_for_tpl(),
-            false,
+                enable_join_vars: true,
+                debug_infinite_loop: false,
+            },
         )));
     }