feat(es/minifier): Improve simplification of ?. (#6681)

**Related issue:** - Closes #6492.
swc-project · Dec 20, 2022 · 707b1e3 · 707b1e3 · github-actions · Dec 20, 2022
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diff --git a/crates/swc_ecma_minifier/src/compress/pure/misc.rs b/crates/swc_ecma_minifier/src/compress/pure/misc.rs
@@ -364,6 +364,30 @@ impl Pure<'_> {
         }
     }
 
+    pub(super) fn optimize_opt_chain(&mut self, e: &mut Expr) {
+        let opt = match e {
+            Expr::OptChain(c) => c,
+            _ => return,
+        };
+
+        if let OptChainBase::Member(base) = &mut opt.base {
+            if match &*base.obj {
+                Expr::Lit(Lit::Null(..)) => false,
+                Expr::Lit(..) | Expr::Object(..) | Expr::Array(..) => true,
+                _ => false,
+            } {
+                self.changed = true;
+                report_change!("Optimized optional chaining expression where object is not null");
+
+                *e = Expr::Member(MemberExpr {
+                    span: opt.span,
+                    obj: base.obj.take(),
+                    prop: base.prop.take(),
+                });
+            }
+        }
+    }
+
     /// new Array(...) -> Array(...)
     pub(super) fn optimize_builtin_object(&mut self, e: &mut Expr) {
         if !self.options.pristine_globals {

diff --git a/crates/swc_ecma_minifier/src/compress/pure/mod.rs b/crates/swc_ecma_minifier/src/compress/pure/mod.rs
@@ -551,6 +551,12 @@ impl VisitMut for Pure<'_> {
         if e.is_seq() {
             debug_assert_valid(e);
         }
+
+        self.optimize_opt_chain(e);
+
+        if e.is_seq() {
+            debug_assert_valid(e);
+        }
     }
 
     fn visit_mut_expr_stmt(&mut self, s: &mut ExprStmt) {

diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/1/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/1/input.js
@@ -0,0 +1,3 @@
+const obj = { key: 42 };
+const val = obj?.[null || 'key']
+console.log('val', val)
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/1/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/1/output.js
@@ -0,0 +1 @@
+console.log('val', 42);
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/2/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/2/input.js
@@ -0,0 +1,3 @@
+const obj = { key: 42 };
+const val = obj?.key.toString()
+console.log('val', val)
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/2/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/2/output.js
@@ -0,0 +1 @@
+console.log('val', "42");
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/3/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/3/input.js
@@ -0,0 +1,3 @@
+const obj = { key: 42 };
+const val = obj?.key?.toString()
+console.log('val', val)
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/3/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/3/output.js
@@ -0,0 +1 @@
+console.log('val', "42");
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/4/input.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/4/input.js
@@ -0,0 +1,3 @@
+const obj = { key: 42 };
+const val = obj.key?.toString()
+console.log('val', val)
diff --git a/crates/swc_ecma_minifier/tests/fixture/issues/6492/4/output.js b/crates/swc_ecma_minifier/tests/fixture/issues/6492/4/output.js
@@ -0,0 +1 @@
+console.log('val', "42");
Benchmark suite	Current: `707b1e3`	Previous: `b23cf50`	Ratio
`es/full/bugs-1`	`327593` ns/iter (`± 13761`)	`302843` ns/iter (`± 7280`)	`1.08`
`es/full/minify/libraries/antd`	`1879294433` ns/iter (`± 51329987`)	`1723045291` ns/iter (`± 32460545`)	`1.09`
`es/full/minify/libraries/d3`	`354004712` ns/iter (`± 8680110`)	`303614755` ns/iter (`± 6708953`)	`1.17`
`es/full/minify/libraries/echarts`	`1371677431` ns/iter (`± 18722436`)	`1298334353` ns/iter (`± 14723118`)	`1.06`
`es/full/minify/libraries/jquery`	`94270302` ns/iter (`± 1719817`)	`90753124` ns/iter (`± 696389`)	`1.04`
`es/full/minify/libraries/lodash`	`120093094` ns/iter (`± 2576260`)	`107638842` ns/iter (`± 813301`)	`1.12`
`es/full/minify/libraries/moment`	`57456271` ns/iter (`± 1632443`)	`52715897` ns/iter (`± 402240`)	`1.09`
`es/full/minify/libraries/react`	`20439897` ns/iter (`± 415736`)	`18987035` ns/iter (`± 118708`)	`1.08`
`es/full/minify/libraries/terser`	`285812165` ns/iter (`± 8738547`)	`250501635` ns/iter (`± 2738023`)	`1.14`
`es/full/minify/libraries/three`	`505176029` ns/iter (`± 11080438`)	`459294786` ns/iter (`± 4153631`)	`1.10`
`es/full/minify/libraries/typescript`	`3423658772` ns/iter (`± 80162755`)	`3235582608` ns/iter (`± 12152018`)	`1.06`
`es/full/minify/libraries/victory`	`750660856` ns/iter (`± 12993719`)	`710275725` ns/iter (`± 9450002`)	`1.06`
`es/full/minify/libraries/vue`	`139112670` ns/iter (`± 3374664`)	`132852980` ns/iter (`± 1078689`)	`1.05`
`es/full/codegen/es3`	`27082` ns/iter (`± 58`)	`27611` ns/iter (`± 163`)	`0.98`
`es/full/codegen/es5`	`27092` ns/iter (`± 63`)	`27639` ns/iter (`± 48`)	`0.98`
`es/full/codegen/es2015`	`27084` ns/iter (`± 51`)	`27574` ns/iter (`± 49`)	`0.98`
`es/full/codegen/es2016`	`27112` ns/iter (`± 55`)	`27602` ns/iter (`± 66`)	`0.98`
`es/full/codegen/es2017`	`27081` ns/iter (`± 42`)	`27587` ns/iter (`± 50`)	`0.98`
`es/full/codegen/es2018`	`27072` ns/iter (`± 40`)	`27599` ns/iter (`± 79`)	`0.98`
`es/full/codegen/es2019`	`27066` ns/iter (`± 29`)	`27608` ns/iter (`± 45`)	`0.98`
`es/full/codegen/es2020`	`27073` ns/iter (`± 43`)	`27581` ns/iter (`± 67`)	`0.98`
`es/full/all/es3`	`177445796` ns/iter (`± 2302123`)	`163312359` ns/iter (`± 3534433`)	`1.09`
`es/full/all/es5`	`166540572` ns/iter (`± 3790227`)	`153121241` ns/iter (`± 3391626`)	`1.09`
`es/full/all/es2015`	`125806018` ns/iter (`± 2295495`)	`118042262` ns/iter (`± 764743`)	`1.07`
`es/full/all/es2016`	`124384914` ns/iter (`± 3467874`)	`117444032` ns/iter (`± 524722`)	`1.06`
`es/full/all/es2017`	`124190475` ns/iter (`± 1676517`)	`115980575` ns/iter (`± 946575`)	`1.07`
`es/full/all/es2018`	`120896068` ns/iter (`± 1095551`)	`114714175` ns/iter (`± 586900`)	`1.05`
`es/full/all/es2019`	`119973463` ns/iter (`± 1736349`)	`113764583` ns/iter (`± 722106`)	`1.05`
`es/full/all/es2020`	`115827498` ns/iter (`± 2119988`)	`109649188` ns/iter (`± 1162521`)	`1.06`
`es/full/parser`	`516731` ns/iter (`± 9867`)	`502537` ns/iter (`± 7229`)	`1.03`
`es/full/base/fixer`	`21841` ns/iter (`± 19`)	`22066` ns/iter (`± 35`)	`0.99`
`es/full/base/resolver_and_hygiene`	`78271` ns/iter (`± 75`)	`77715` ns/iter (`± 74`)	`1.01`
`serialization of ast node`	`118` ns/iter (`± 0`)	`119` ns/iter (`± 0`)	`0.99`
`serialization of serde`	`124` ns/iter (`± 0`)	`124` ns/iter (`± 0`)	`1`
`css/minify/libraries/bootstrap`	`27955915` ns/iter (`± 111092`)	`26827893` ns/iter (`± 133781`)	`1.04`
`css/visitor/compare/clone`	`2079889` ns/iter (`± 26384`)	`2085610` ns/iter (`± 13202`)	`1.00`
`css/visitor/compare/visit_mut_span`	`2259923` ns/iter (`± 10822`)	`2249047` ns/iter (`± 4686`)	`1.00`
`css/visitor/compare/visit_mut_span_panic`	`2304790` ns/iter (`± 10239`)	`2303935` ns/iter (`± 7806`)	`1.00`
`css/visitor/compare/fold_span`	`2981514` ns/iter (`± 25067`)	`2998789` ns/iter (`± 27094`)	`0.99`
`css/visitor/compare/fold_span_panic`	`3182184` ns/iter (`± 49523`)	`3118083` ns/iter (`± 18227`)	`1.02`
`css/lexer/bootstrap_5_1_3`	`5180364` ns/iter (`± 1932`)	`5178678` ns/iter (`± 1434`)	`1.00`
`css/lexer/foundation_6_7_4`	`4379508` ns/iter (`± 3770`)	`4355084` ns/iter (`± 2516`)	`1.01`
`css/lexer/tailwind_3_1_1`	`831175` ns/iter (`± 1189`)	`827409` ns/iter (`± 1509`)	`1.00`
`css/parser/bootstrap_5_1_3`	`21173923` ns/iter (`± 218096`)	`20783355` ns/iter (`± 69493`)	`1.02`
`css/parser/foundation_6_7_4`	`17112235` ns/iter (`± 264111`)	`16534879` ns/iter (`± 30123`)	`1.03`
`css/parser/tailwind_3_1_1`	`3206854` ns/iter (`± 4310`)	`3202702` ns/iter (`± 4041`)	`1.00`
`es/codegen/colors`	`324365` ns/iter (`± 181723`)	`333159` ns/iter (`± 187221`)	`0.97`
`es/codegen/large`	`1242664` ns/iter (`± 638837`)	`1077868` ns/iter (`± 549422`)	`1.15`
`es/codegen/with-parser/colors`	`46430` ns/iter (`± 367`)	`46075` ns/iter (`± 262`)	`1.01`
`es/codegen/with-parser/large`	`519298` ns/iter (`± 3195`)	`515727` ns/iter (`± 1794`)	`1.01`
`es/minify/libraries/antd`	`1629597814` ns/iter (`± 23705722`)	`1505844239` ns/iter (`± 26897697`)	`1.08`
`es/minify/libraries/d3`	`288255513` ns/iter (`± 8470546`)	`256456162` ns/iter (`± 3365684`)	`1.12`
`es/minify/libraries/echarts`	`1209729709` ns/iter (`± 24211699`)	`1127607755` ns/iter (`± 9941444`)	`1.07`
`es/minify/libraries/jquery`	`85080296` ns/iter (`± 2917469`)	`78529747` ns/iter (`± 404657`)	`1.08`
`es/minify/libraries/lodash`	`103126331` ns/iter (`± 1051170`)	`94826988` ns/iter (`± 884518`)	`1.09`
`es/minify/libraries/moment`	`50028949` ns/iter (`± 1438005`)	`46189842` ns/iter (`± 259937`)	`1.08`
`es/minify/libraries/react`	`17970081` ns/iter (`± 198475`)	`16740508` ns/iter (`± 74006`)	`1.07`
`es/minify/libraries/terser`	`230752394` ns/iter (`± 4062459`)	`214891458` ns/iter (`± 1272267`)	`1.07`
`es/minify/libraries/three`	`456250840` ns/iter (`± 23807965`)	`384676410` ns/iter (`± 8159281`)	`1.19`
`es/minify/libraries/typescript`	`2916366036` ns/iter (`± 27574480`)	`2733600962` ns/iter (`± 24131813`)	`1.07`
`es/minify/libraries/victory`	`684008932` ns/iter (`± 15974650`)	`589260404` ns/iter (`± 8779888`)	`1.16`
`es/minify/libraries/vue`	`130354583` ns/iter (`± 6926008`)	`116776681` ns/iter (`± 749375`)	`1.12`
`es/visitor/compare/clone`	`2513363` ns/iter (`± 18659`)	`2419140` ns/iter (`± 5224`)	`1.04`
`es/visitor/compare/visit_mut_span`	`2956312` ns/iter (`± 30946`)	`2812898` ns/iter (`± 3429`)	`1.05`
`es/visitor/compare/visit_mut_span_panic`	`2914279` ns/iter (`± 21175`)	`2865075` ns/iter (`± 3694`)	`1.02`
`es/visitor/compare/fold_span`	`4004219` ns/iter (`± 17811`)	`3968315` ns/iter (`± 12193`)	`1.01`
`es/visitor/compare/fold_span_panic`	`4259262` ns/iter (`± 85704`)	`4121378` ns/iter (`± 7850`)	`1.03`
`es/lexer/colors`	`17410` ns/iter (`± 17`)	`17328` ns/iter (`± 32`)	`1.00`
`es/lexer/angular`	`8208407` ns/iter (`± 2552`)	`8213544` ns/iter (`± 2665`)	`1.00`
`es/lexer/backbone`	`1069149` ns/iter (`± 366`)	`1070329` ns/iter (`± 685`)	`1.00`
`es/lexer/jquery`	`5935524` ns/iter (`± 3692`)	`5933284` ns/iter (`± 4526`)	`1.00`
`es/lexer/jquery mobile`	`9151722` ns/iter (`± 5670`)	`9114890` ns/iter (`± 8279`)	`1.00`
`es/lexer/mootools`	`4648318` ns/iter (`± 937`)	`4643199` ns/iter (`± 2635`)	`1.00`
`es/lexer/underscore`	`892468` ns/iter (`± 359`)	`893419` ns/iter (`± 1755`)	`1.00`
`es/lexer/three`	`27830988` ns/iter (`± 6071`)	`27607135` ns/iter (`± 12496`)	`1.01`
`es/lexer/yui`	`5029570` ns/iter (`± 1563`)	`5045214` ns/iter (`± 3447`)	`1.00`
`es/parser/colors`	`30896` ns/iter (`± 159`)	`30770` ns/iter (`± 260`)	`1.00`
`es/parser/angular`	`16893011` ns/iter (`± 244243`)	`15577497` ns/iter (`± 100432`)	`1.08`
`es/parser/backbone`	`2333752` ns/iter (`± 11838`)	`2306206` ns/iter (`± 9443`)	`1.01`
`es/parser/jquery`	`13433849` ns/iter (`± 207178`)	`12505208` ns/iter (`± 58819`)	`1.07`
`es/parser/jquery mobile`	`21857379` ns/iter (`± 438182`)	`19867086` ns/iter (`± 267847`)	`1.10`
`es/parser/mootools`	`9641910` ns/iter (`± 31411`)	`9589804` ns/iter (`± 26451`)	`1.01`
`es/parser/underscore`	`1962758` ns/iter (`± 11500`)	`1959248` ns/iter (`± 11956`)	`1.00`
`es/parser/three`	`62004811` ns/iter (`± 621284`)	`58831527` ns/iter (`± 838893`)	`1.05`
`es/parser/yui`	`9992090` ns/iter (`± 52980`)	`9607207` ns/iter (`± 50324`)	`1.04`
`es/preset-env/usage/builtin_type`	`142604` ns/iter (`± 32846`)	`143908` ns/iter (`± 33737`)	`0.99`
`es/preset-env/usage/property`	`21732` ns/iter (`± 104`)	`21680` ns/iter (`± 70`)	`1.00`
`es/resolver/typescript`	`121163818` ns/iter (`± 4107788`)	`116727632` ns/iter (`± 2629148`)	`1.04`
`es/fixer/typescript`	`100009174` ns/iter (`± 1070574`)	`95921067` ns/iter (`± 1149141`)	`1.04`
`es/hygiene/typescript`	`199526123` ns/iter (`± 4337813`)	`187543572` ns/iter (`± 1207473`)	`1.06`
`es/resolver_with_hygiene/typescript`	`332458258` ns/iter (`± 2494168`)	`320022745` ns/iter (`± 1935664`)	`1.04`
`es/visitor/base-perf/module_clone`	`75856` ns/iter (`± 1321`)	`76116` ns/iter (`± 1021`)	`1.00`
`es/visitor/base-perf/fold_empty`	`85789` ns/iter (`± 888`)	`85562` ns/iter (`± 1559`)	`1.00`
`es/visitor/base-perf/fold_noop_impl_all`	`85912` ns/iter (`± 1335`)	`85879` ns/iter (`± 979`)	`1.00`
`es/visitor/base-perf/fold_noop_impl_vec`	`86185` ns/iter (`± 1887`)	`86588` ns/iter (`± 2240`)	`1.00`
`es/visitor/base-perf/boxing_boxed_clone`	`56` ns/iter (`± 0`)	`56` ns/iter (`± 0`)	`1`
`es/visitor/base-perf/boxing_unboxed_clone`	`59` ns/iter (`± 0`)	`60` ns/iter (`± 0`)	`0.98`
`es/visitor/base-perf/boxing_boxed`	`104` ns/iter (`± 0`)	`103` ns/iter (`± 0`)	`1.01`
`es/visitor/base-perf/boxing_unboxed`	`102` ns/iter (`± 0`)	`101` ns/iter (`± 0`)	`1.01`
`es/visitor/base-perf/visit_contains_this`	`3516` ns/iter (`± 88`)	`3532` ns/iter (`± 54`)	`1.00`
`es/base/parallel/resolver/typescript`	`5243881409` ns/iter (`± 460493701`)	`5663909412` ns/iter (`± 518171900`)	`0.93`
`es/base/parallel/hygiene/typescript`	`2263019292` ns/iter (`± 41429871`)	`2205971525` ns/iter (`± 31968284`)	`1.03`
`misc/visitors/time-complexity/time 5`	`102` ns/iter (`± 0`)	`102` ns/iter (`± 0`)	`1`
`misc/visitors/time-complexity/time 10`	`330` ns/iter (`± 1`)	`316` ns/iter (`± 0`)	`1.04`
`misc/visitors/time-complexity/time 15`	`668` ns/iter (`± 1`)	`646` ns/iter (`± 0`)	`1.03`
`misc/visitors/time-complexity/time 20`	`1262` ns/iter (`± 11`)	`1243` ns/iter (`± 14`)	`1.02`
`misc/visitors/time-complexity/time 40`	`6636` ns/iter (`± 16`)	`6695` ns/iter (`± 23`)	`0.99`
`misc/visitors/time-complexity/time 60`	`17130` ns/iter (`± 14`)	`17142` ns/iter (`± 69`)	`1.00`
`es/full-target/es2016`	`188310` ns/iter (`± 524`)	`188716` ns/iter (`± 788`)	`1.00`
`es/full-target/es2017`	`183962` ns/iter (`± 688`)	`183349` ns/iter (`± 860`)	`1.00`
`es/full-target/es2018`	`174442` ns/iter (`± 591`)	`172697` ns/iter (`± 761`)	`1.01`
`es2020_nullish_coalescing`	`67065` ns/iter (`± 152`)	`67392` ns/iter (`± 120`)	`1.00`
`es2020_optional_chaining`	`96800` ns/iter (`± 1920`)	`96075` ns/iter (`± 409`)	`1.01`
`es2022_class_properties`	`94689` ns/iter (`± 145`)	`93696` ns/iter (`± 142`)	`1.01`
`es2018_object_rest_spread`	`71837` ns/iter (`± 150`)	`71659` ns/iter (`± 131`)	`1.00`
`es2019_optional_catch_binding`	`61644` ns/iter (`± 115`)	`61801` ns/iter (`± 147`)	`1.00`
`es2017_async_to_generator`	`61795` ns/iter (`± 111`)	`62113` ns/iter (`± 117`)	`0.99`
`es2016_exponentiation`	`65624` ns/iter (`± 139`)	`65577` ns/iter (`± 241`)	`1.00`
`es2015_arrow`	`70833` ns/iter (`± 277`)	`70831` ns/iter (`± 167`)	`1.00`
`es2015_block_scoped_fn`	`66504` ns/iter (`± 85`)	`66247` ns/iter (`± 124`)	`1.00`
`es2015_block_scoping`	`139896` ns/iter (`± 9466`)	`149333` ns/iter (`± 8940`)	`0.94`
`es2015_classes`	`116684` ns/iter (`± 389`)	`116597` ns/iter (`± 385`)	`1.00`
`es2015_computed_props`	`61599` ns/iter (`± 113`)	`61514` ns/iter (`± 93`)	`1.00`
`es2015_destructuring`	`116742` ns/iter (`± 191`)	`116319` ns/iter (`± 237`)	`1.00`
`es2015_duplicate_keys`	`64370` ns/iter (`± 105`)	`64647` ns/iter (`± 79`)	`1.00`
`es2015_parameters`	`79784` ns/iter (`± 184`)	`79812` ns/iter (`± 237`)	`1.00`
`es2015_fn_name`	`67667` ns/iter (`± 741`)	`67061` ns/iter (`± 540`)	`1.01`
`es2015_for_of`	`65011` ns/iter (`± 114`)	`64882` ns/iter (`± 105`)	`1.00`
`es2015_instanceof`	`62977` ns/iter (`± 769`)	`63795` ns/iter (`± 114`)	`0.99`
`es2015_shorthand_property`	`59805` ns/iter (`± 87`)	`61367` ns/iter (`± 103`)	`0.97`
`es2015_spread`	`59927` ns/iter (`± 69`)	`61553` ns/iter (`± 109`)	`0.97`
`es2015_sticky_regex`	`60997` ns/iter (`± 71`)	`62593` ns/iter (`± 98`)	`0.97`
`es2015_typeof_symbol`	`61369` ns/iter (`± 85`)	`62613` ns/iter (`± 73`)	`0.98`
`es/transform/baseline/base`	`51024` ns/iter (`± 99`)	`52372` ns/iter (`± 110`)	`0.97`
`es/transform/baseline/common_reserved_word`	`61743` ns/iter (`± 93`)	`62808` ns/iter (`± 109`)	`0.98`
`es/transform/baseline/common_typescript`	`139079` ns/iter (`± 1753`)	`168695` ns/iter (`± 9701`)	`0.82`
`es/target/es3`	`165953` ns/iter (`± 1515`)	`169559` ns/iter (`± 160`)	`0.98`
`es/target/es2015`	`601201` ns/iter (`± 4135`)	`626662` ns/iter (`± 1363`)	`0.96`
`es/target/es2016`	`63988` ns/iter (`± 85`)	`65569` ns/iter (`± 153`)	`0.98`
`es/target/es2017`	`60429` ns/iter (`± 82`)	`62311` ns/iter (`± 120`)	`0.97`
`es/target/es2018`	`80002` ns/iter (`± 78`)	`82022` ns/iter (`± 85`)	`0.98`
`es/target/es2020`	`129689` ns/iter (`± 108`)	`133388` ns/iter (`± 480`)	`0.97`
`babelify-only`	`670897` ns/iter (`± 1222`)	`680562` ns/iter (`± 1496`)	`0.99`
`parse_and_babelify_angular`	`50352764` ns/iter (`± 1367408`)	`43593527` ns/iter (`± 912958`)	`1.16`
`parse_and_babelify_backbone`	`5992010` ns/iter (`± 139534`)	`5322693` ns/iter (`± 34459`)	`1.13`
`parse_and_babelify_jquery`	`37003769` ns/iter (`± 408041`)	`32262250` ns/iter (`± 481678`)	`1.15`
`parse_and_babelify_jquery_mobile`	`59922453` ns/iter (`± 580946`)	`54604649` ns/iter (`± 660305`)	`1.10`
`parse_and_babelify_mootools`	`37040028` ns/iter (`± 709885`)	`33571698` ns/iter (`± 530632`)	`1.10`
`parse_and_babelify_underscore`	`4545061` ns/iter (`± 121050`)	`4272272` ns/iter (`± 29631`)	`1.06`
`parse_and_babelify_yui`	`38525994` ns/iter (`± 660442`)	`33100982` ns/iter (`± 381982`)	`1.16`
`html/minify/document/css_spec`	`44658197` ns/iter (`± 356775`)	`41484365` ns/iter (`± 169540`)	`1.08`
`html/minify/document/github`	`17622032` ns/iter (`± 112296`)	`17326646` ns/iter (`± 50167`)	`1.02`
`html/minify/document/stackoverflow`	`15929186` ns/iter (`± 66309`)	`15493484` ns/iter (`± 24783`)	`1.03`
`html/minify/document_fragment/css_spec`	`41766737` ns/iter (`± 703034`)	`39717165` ns/iter (`± 119225`)	`1.05`
`html/minify/document_fragment/github`	`17095392` ns/iter (`± 71475`)	`16642910` ns/iter (`± 21255`)	`1.03`
`html/minify/document_fragment/stackoverflow`	`15644094` ns/iter (`± 114227`)	`15018719` ns/iter (`± 19253`)	`1.04`
`html/document/visitor/compare/clone`	`341421` ns/iter (`± 2612`)	`341709` ns/iter (`± 1266`)	`1.00`
`html/document/visitor/compare/visit_mut_span`	`365665` ns/iter (`± 2164`)	`369573` ns/iter (`± 2332`)	`0.99`
`html/document/visitor/compare/visit_mut_span_panic`	`375776` ns/iter (`± 2443`)	`377834` ns/iter (`± 1607`)	`0.99`
`html/document/visitor/compare/fold_span`	`402967` ns/iter (`± 1744`)	`408843` ns/iter (`± 2537`)	`0.99`
`html/document/visitor/compare/fold_span_panic`	`459862` ns/iter (`± 2145`)	`465409` ns/iter (`± 3118`)	`0.99`
`html/document_fragment/visitor/compare/clone`	`341890` ns/iter (`± 2523`)	`339246` ns/iter (`± 2093`)	`1.01`
`html/document_fragment/visitor/compare/visit_mut_span`	`371061` ns/iter (`± 1528`)	`363781` ns/iter (`± 2014`)	`1.02`
`html/document_fragment/visitor/compare/visit_mut_span_panic`	`378361` ns/iter (`± 1860`)	`375710` ns/iter (`± 1877`)	`1.01`
`html/document_fragment/visitor/compare/fold_span`	`406541` ns/iter (`± 2574`)	`405310` ns/iter (`± 2832`)	`1.00`
`html/document_fragment/visitor/compare/fold_span_panic`	`458187` ns/iter (`± 2095`)	`460192` ns/iter (`± 1707`)	`1.00`
`html/lexer/css_2021_spec`	`15594477` ns/iter (`± 97705`)	`15596391` ns/iter (`± 16565`)	`1.00`
`html/lexer/github_com_17_05_2022`	`6050537` ns/iter (`± 5579`)	`6025020` ns/iter (`± 2174`)	`1.00`
`html/lexer/stackoverflow_com_17_05_2022`	`5660536` ns/iter (`± 2432`)	`5634222` ns/iter (`± 4813`)	`1.00`
`html/parser/parser_document/css_2021_spec`	`26732454` ns/iter (`± 309540`)	`25780436` ns/iter (`± 234292`)	`1.04`
`html/parser/parser_document/github_com_17_05_2022`	`8795833` ns/iter (`± 9685`)	`8818410` ns/iter (`± 12172`)	`1.00`
`html/parser/parser_document/stackoverflow_com_17_05_2022`	`7795730` ns/iter (`± 11858`)	`7757448` ns/iter (`± 5309`)	`1.00`
`html/parser/parser_document_fragment/css_2021_spec`	`27424937` ns/iter (`± 402616`)	`25535133` ns/iter (`± 91383`)	`1.07`
`html/parser/parser_document_fragment/github_com_17_05_2022`	`8860619` ns/iter (`± 12337`)	`8801488` ns/iter (`± 9222`)	`1.01`
`html/parser/parser_document_fragment/stackoverflow_com_17_05_2022`	`7779974` ns/iter (`± 9383`)	`7762645` ns/iter (`± 5515`)	`1.00`