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feat(es/compat): Skip empty class static blocks (#8138)
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**Description:**

And update the `static_block_private_id` generate rules to be consistent with Babel.

**Related issue:**

 - #8136
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@magic-akari
magic-akari committed Oct 18, 2023
1 parent 34b0167 commit e186b80
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Showing 16 changed files with 61 additions and 94 deletions.
6 changes: 0 additions & 6 deletions crates/swc/tests/tsc-references/classStaticBlock14.1.normal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,9 +13,3 @@ var __5 = {
writable: true,
value: 1
};
(()=>{})();
(()=>{})();
(()=>{})();
(()=>{})();
(()=>{})();
(()=>{})();
6 changes: 0 additions & 6 deletions crates/swc/tests/tsc-references/classStaticBlock15(target=es2015).1.normal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,10 +14,4 @@ var __5 = {
writable: true,
value: 5
};
(()=>{})();
(()=>{})();
(()=>{})();
(()=>{})();
(()=>{})();
(()=>{})();
console.log(_C__1);
4 changes: 1 addition & 3 deletions crates/swc/tests/tsc-references/classStaticBlock18(target=es2015).1.normal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,6 @@ function foo() {
}, _class.foo = 1, (()=>{
var _class;
const c = (_class = class {
}, _class.bar = 2, (()=>{
// do
})(), _class);
}, _class.bar = 2, _class);
})(), _class;
}
4 changes: 1 addition & 3 deletions crates/swc/tests/tsc-references/classStaticBlock18(target=es5).1.normal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,6 @@ function foo() {
var c = (_class = function _class() {
"use strict";
_class_call_check(this, _class);
}, _class.bar = 2, function() {
// do
}(), _class);
}, _class.bar = 2, _class);
}(), _class;
}
3 changes: 0 additions & 3 deletions crates/swc/tests/tsc-references/classStaticBlock21.1.normal.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,3 @@ var C = function C() {
"use strict";
_class_call_check(this, C);
};
(function() {
// something
})();
42 changes: 28 additions & 14 deletions crates/swc_ecma_compat_es2022/src/static_blocks.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@ pub fn static_blocks(mark: Mark) -> impl Fold + VisitMut {

#[swc_trace]
impl ClassStaticBlock {
fn visit_mut_static_block(
fn transform_static_block(
&mut self,
mut static_block: StaticBlock,
private_id: JsWord,
Expand Down Expand Up @@ -86,22 +86,36 @@ impl VisitMut for ClassStaticBlock {
}
}

let mut count = 0;
for member in class.body.iter_mut() {
if let ClassMember::StaticBlock(static_block) = member {
let static_block_private_id: JsWord = {
let mut id_value: JsWord = "_".into();
let mut count = 0;
while private_names.contains(&id_value) {
count += 1;
id_value = format!("_{}", count).into();
}
private_names.insert(id_value.clone());
id_value
};
*member = ClassMember::PrivateProp(
self.visit_mut_static_block(static_block.take(), static_block_private_id),
)
if static_block.body.stmts.is_empty() {
*member = ClassMember::dummy();
continue;
}

let static_block_private_id = generate_uid(&private_names, &mut count);
*member = self
.transform_static_block(static_block.take(), static_block_private_id)
.into();
};
}
}
}

fn generate_uid(deny_list: &AHashSet<JsWord>, i: &mut u32) -> JsWord {
*i += 1;

let mut uid: JsWord = if *i == 1 {
"_".to_string()
} else {
format!("_{i}")
}
.into();
while deny_list.contains(&uid) {
*i += 1;
uid = format!("_{i}").into();
}

uid
}
1 change: 0 additions & 1 deletion crates/swc_ecma_transforms_compat/tests/static-blocks/basic/export-default/output.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@
export default class Foo {
#foo;
static #_ = (()=>{})();
}
2 changes: 1 addition & 1 deletion ...c_ecma_transforms_compat/tests/static-blocks/basic/multiple-static-initializers/output.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,5 +5,5 @@ class Foo {
this.qux1 = this.qux;
})();
static qux = 21;
static #_1 = this.qux2 = this.qux;
static #_2 = this.qux2 = this.qux;
}
2 changes: 1 addition & 1 deletion crates/swc_ecma_transforms_compat/tests/static-blocks/basic/name-conflicts01/output.js
View file
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
class Foo {
static #_ = 42;
static #_1 = this.foo = this.#_;
static #_2 = this.foo = this.#_;
}
2 changes: 1 addition & 1 deletion ...al/tests/decorators/2022-03-classes--to-es2015/decorator-access-modified-fields/output.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,7 +23,7 @@ var __ = {
classDec
])
};
var __1 = {
var __2 = {
writable: true,
value: _initClass()
};
2 changes: 1 addition & 1 deletion ...l/tests/decorators/2022-03-classes--to-es2015/decorator-access-modified-methods/output.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ var __ = {
classDec
])
};
var __1 = {
var __2 = {
writable: true,
value: _initClass()
};
45 changes: 9 additions & 36 deletions ..._proposal/tests/decorators/2022-03-classes--to-es2015/expressions-static-blocks/output.js
View file
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
var _A, __, __1, __2, _C, __3, __11, __21, _class, __4, __12, __22, _class1, __5, __13, __23, _G, __6, __14, __24, _class2, __7, __15, __25, _class3, __8, __16, __26, _K, __9, __17, __27;
var _A, __, __2, _C, __1, __21, _class, __3, __22, _class1, __4, __23, _G, __5, __24, _class2, __6, __25, _class3, __7, __26, _K, __8, __27;
var _initClass, _A1, _initClass1, _C1, _initClass2, _class4, _initClass3, _class5, _initClass4, _G1, _initClass5, _class6, _initClass6, _class7, _I, _initClass7, _K1, _L;
const dec = ()=>{};
const A = ((_A = class A {
Expand All @@ -7,118 +7,91 @@ const A = ((_A = class A {
value: { c: [_A1, _initClass] } = _apply_decs_2203_r(_A, [], [
dec
])
}, __1 = {
writable: true,
value: (()=>{})()
}, __2 = {
writable: true,
value: _initClass()
}, _A), _A1);
const B = ((_C = class C {
}, __3 = {
}, __1 = {
writable: true,
value: { c: [_C1, _initClass1] } = _apply_decs_2203_r(_C, [], [
dec
])
}, __11 = {
writable: true,
value: (()=>{})()
}, __21 = {
writable: true,
value: _initClass1()
}, _C), _C1);
const D = ((_class = class {
}, __4 = {
}, __3 = {
writable: true,
value: { c: [_class4, _initClass2] } = _apply_decs_2203_r(_class, [], [
dec
])
}, __12 = {
writable: true,
value: (()=>{})()
}, __22 = {
writable: true,
value: _initClass2()
}, _class), _class4);
const E = (((_class1 = class {
}, __5 = {
}, __4 = {
writable: true,
value: { c: [_class5, _initClass3] } = _apply_decs_2203_r(_class1, [], [
dec
])
}, __13 = {
writable: true,
value: (()=>{})()
}, __23 = {
writable: true,
value: _initClass3()
}, _class1), _class5), 123);
const F = [
((_G = class G {
}, __6 = {
}, __5 = {
writable: true,
value: { c: [_G1, _initClass4] } = _apply_decs_2203_r(_G, [], [
dec
])
}, __14 = {
writable: true,
value: (()=>{})()
}, __24 = {
writable: true,
value: _initClass4()
}, _G), _G1),
((_class2 = class {
}, __7 = {
}, __6 = {
writable: true,
value: { c: [_class6, _initClass5] } = _apply_decs_2203_r(_class2, [], [
dec
])
}, __15 = {
writable: true,
value: (()=>{})()
}, __25 = {
writable: true,
value: _initClass5()
}, _class2), _class6)
];
const H = ((_class3 = class extends (_I = I) {
}, __8 = {
}, __7 = {
writable: true,
value: { c: [_class7, _initClass6] } = _apply_decs_2203_r(_class3, [], [
dec
], _I)
}, __16 = {
writable: true,
value: (()=>{})()
}, __26 = {
writable: true,
value: _initClass6()
}, _class3), _class7);
const J = ((_K = class K extends (_L = L) {
}, __9 = {
}, __8 = {
writable: true,
value: { c: [_K1, _initClass7] } = _apply_decs_2203_r(_K, [], [
dec
], _L)
}, __17 = {
writable: true,
value: (()=>{})()
}, __27 = {
writable: true,
value: _initClass7()
}, _K), _K1);
function classFactory() {
var _class, __, __1, __2;
var _class, __, __2;
var _initClass, _class1;
return _class = class {
}, __ = {
writable: true,
value: { c: [_class1, _initClass] } = _apply_decs_2203_r(_class, [], [
dec
])
}, __1 = {
writable: true,
value: (()=>{})()
}, __2 = {
writable: true,
value: _initClass()
Expand Down
24 changes: 12 additions & 12 deletions ...cma_transforms_proposal/tests/decorators/2022-03-classes--to-es2015/expressions/output.js
View file
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
var _A, __, __1, _C, __2, __11, _class, __3, __12, _class1, __4, __13, _G, __5, __14, _class2, __6, __15, _class3, __7, __16, _K, __8, __17;
var _A, __, __2, _C, __1, __21, _class, __3, __22, _class1, __4, __23, _G, __5, __24, _class2, __6, __25, _class3, __7, __26, _K, __8, __27;
var _initClass, _A1, _initClass1, _C1, _initClass2, _class4, _initClass3, _class5, _initClass4, _G1, _initClass5, _class6, _initClass6, _class7, _I, _initClass7, _K1, _L;
const dec = ()=>{};
const A = ((_A = class A {
Expand All @@ -7,17 +7,17 @@ const A = ((_A = class A {
value: { c: [_A1, _initClass] } = _apply_decs_2203_r(_A, [], [
dec
])
}, __1 = {
}, __2 = {
writable: true,
value: _initClass()
}, _A), _A1);
const B = ((_C = class C {
}, __2 = {
}, __1 = {
writable: true,
value: { c: [_C1, _initClass1] } = _apply_decs_2203_r(_C, [], [
dec
])
}, __11 = {
}, __21 = {
writable: true,
value: _initClass1()
}, _C), _C1);
Expand All @@ -27,7 +27,7 @@ const D = ((_class = class {
value: { c: [_class4, _initClass2] } = _apply_decs_2203_r(_class, [], [
dec
])
}, __12 = {
}, __22 = {
writable: true,
value: _initClass2()
}, _class), _class4);
Expand All @@ -37,7 +37,7 @@ const E = (((_class1 = class {
value: { c: [_class5, _initClass3] } = _apply_decs_2203_r(_class1, [], [
dec
])
}, __13 = {
}, __23 = {
writable: true,
value: _initClass3()
}, _class1), _class5), 123);
Expand All @@ -48,7 +48,7 @@ const F = [
value: { c: [_G1, _initClass4] } = _apply_decs_2203_r(_G, [], [
dec
])
}, __14 = {
}, __24 = {
writable: true,
value: _initClass4()
}, _G), _G1),
Expand All @@ -58,7 +58,7 @@ const F = [
value: { c: [_class6, _initClass5] } = _apply_decs_2203_r(_class2, [], [
dec
])
}, __15 = {
}, __25 = {
writable: true,
value: _initClass5()
}, _class2), _class6)
Expand All @@ -69,7 +69,7 @@ const H = ((_class3 = class extends (_I = I) {
value: { c: [_class7, _initClass6] } = _apply_decs_2203_r(_class3, [], [
dec
], _I)
}, __16 = {
}, __26 = {
writable: true,
value: _initClass6()
}, _class3), _class7);
Expand All @@ -79,20 +79,20 @@ const J = ((_K = class K extends (_L = L) {
value: { c: [_K1, _initClass7] } = _apply_decs_2203_r(_K, [], [
dec
], _L)
}, __17 = {
}, __27 = {
writable: true,
value: _initClass7()
}, _K), _K1);
function classFactory() {
var _class, __, __1;
var _class, __, __2;
var _initClass, _class1;
return _class = class {
}, __ = {
writable: true,
value: { c: [_class1, _initClass] } = _apply_decs_2203_r(_class, [], [
dec
])
}, __1 = {
}, __2 = {
writable: true,
value: _initClass()
}, _class, _class1;
Expand Down
6 changes: 3 additions & 3 deletions ...cma_transforms_proposal/tests/decorators/2022-03-classes--to-es2015/inheritance/output.js
View file
Original file line number Diff line number Diff line change
Expand Up @@ -10,20 +10,20 @@ var __ = {
dec1
])
};
var __1 = {
var __2 = {
writable: true,
value: _initClass()
};
let _Foo;
class Foo extends (_Bar = _Bar1) {
}
var __2 = {
var __1 = {
writable: true,
value: { c: [_Foo, _initClass1] } = _apply_decs_2203_r(Foo, [], [
dec2
], _Bar)
};
var __11 = {
var __21 = {
writable: true,
value: _initClass1()
};

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Benchmark

Benchmark suite Current: e186b80 Previous: bffe33a Ratio
es/full/bugs-1 282550 ns/iter (± 7717) 284101 ns/iter (± 5089) 0.99
es/full/minify/libraries/antd 1384373816 ns/iter (± 19517629) 1402131384 ns/iter (± 13074805) 0.99
es/full/minify/libraries/d3 291684503 ns/iter (± 2637807) 295972404 ns/iter (± 2395737) 0.99
es/full/minify/libraries/echarts 1107930076 ns/iter (± 6037957) 1129919682 ns/iter (± 4272904) 0.98
es/full/minify/libraries/jquery 88911549 ns/iter (± 918564) 89298718 ns/iter (± 208814) 1.00
es/full/minify/libraries/lodash 103603119 ns/iter (± 315351) 104544053 ns/iter (± 266372) 0.99
es/full/minify/libraries/moment 52161073 ns/iter (± 76455) 52651896 ns/iter (± 107827) 0.99
es/full/minify/libraries/react 18828503 ns/iter (± 52955) 18967284 ns/iter (± 110836) 0.99
es/full/minify/libraries/terser 229079800 ns/iter (± 1565967) 230975986 ns/iter (± 825561) 0.99
es/full/minify/libraries/three 411031599 ns/iter (± 2178496) 413013854 ns/iter (± 2520735) 1.00
es/full/minify/libraries/typescript 2792299928 ns/iter (± 7248821) 2792014299 ns/iter (± 7520902) 1.00
es/full/minify/libraries/victory 594477849 ns/iter (± 5600441) 599994242 ns/iter (± 2696170) 0.99
es/full/minify/libraries/vue 125406477 ns/iter (± 533624) 128628100 ns/iter (± 1047610) 0.97
es/full/codegen/es3 33266 ns/iter (± 83) 35326 ns/iter (± 143) 0.94
es/full/codegen/es5 33251 ns/iter (± 121) 35517 ns/iter (± 146) 0.94
es/full/codegen/es2015 33262 ns/iter (± 101) 35375 ns/iter (± 97) 0.94
es/full/codegen/es2016 33201 ns/iter (± 64) 35429 ns/iter (± 40) 0.94
es/full/codegen/es2017 33225 ns/iter (± 179) 35361 ns/iter (± 98) 0.94
es/full/codegen/es2018 33169 ns/iter (± 76) 35489 ns/iter (± 171) 0.93
es/full/codegen/es2019 33254 ns/iter (± 66) 35412 ns/iter (± 127) 0.94
es/full/codegen/es2020 33198 ns/iter (± 70) 35461 ns/iter (± 125) 0.94
es/full/all/es3 177186202 ns/iter (± 1240760) 176745682 ns/iter (± 1104320) 1.00
es/full/all/es5 170003284 ns/iter (± 774839) 169236775 ns/iter (± 1105646) 1.00
es/full/all/es2015 130917469 ns/iter (± 5958145) 128214840 ns/iter (± 694454) 1.02
es/full/all/es2016 127629620 ns/iter (± 917737) 126746080 ns/iter (± 878373) 1.01
es/full/all/es2017 127703572 ns/iter (± 1340654) 126127936 ns/iter (± 680482) 1.01
es/full/all/es2018 125494822 ns/iter (± 345831) 124531356 ns/iter (± 668499) 1.01
es/full/all/es2019 125101983 ns/iter (± 1004671) 123807639 ns/iter (± 840679) 1.01
es/full/all/es2020 120896160 ns/iter (± 377928) 120288284 ns/iter (± 819585) 1.01
es/full/parser 562199 ns/iter (± 4451) 565911 ns/iter (± 3729) 0.99
es/full/base/fixer 17652 ns/iter (± 44) 19239 ns/iter (± 265) 0.92
es/full/base/resolver_and_hygiene 85003 ns/iter (± 571) 84076 ns/iter (± 206) 1.01

This comment was automatically generated by workflow using github-action-benchmark.

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