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feat(minifier): remove new from NativeErrors / AggregateError #8430

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merged 1 commit into from
Jan 11, 2025
+35 −9
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feat(minifier): remove new from NativeErrors / AggregateError #8430

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32 changes: 29 additions & 3 deletions crates/oxc_minifier/src/ast_passes/peephole_substitute_alternate_syntax.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -979,7 +979,8 @@ impl<'a, 'b> PeepholeSubstituteAlternateSyntax {
}
}

/// `new Error()` -> `Error()`
/// `new Error()` -> `Error()` (also for NativeErrors)
/// `new AggregateError()` -> `AggregateError()`
/// `new Function()` -> `Function()`
/// `new RegExp()` -> `RegExp()`
fn try_fold_new_expression(
Expand All @@ -988,14 +989,17 @@ impl<'a, 'b> PeepholeSubstituteAlternateSyntax {
) -> Option<Expression<'a>> {
let Expression::Identifier(ident) = &e.callee else { return None };
let name = ident.name.as_str();
if !matches!(name, "Error" | "Function" | "RegExp") {
if !matches!(name, "Error" | "AggregateError" | "Function" | "RegExp")
&& !Self::is_native_error_name(name)
{
return None;
}
if !ctx.is_global_reference(ident) {
return None;
}
if match name {
"Error" | "Function" => true,
"Error" | "AggregateError" | "Function" => true,
_ if Self::is_native_error_name(name) => true,
"RegExp" => {
let arguments_len = e.arguments.len();
arguments_len == 0
Expand All @@ -1019,6 +1023,21 @@ impl<'a, 'b> PeepholeSubstituteAlternateSyntax {
}
}

/// Whether the name matches any native error name.
///
/// See <https://tc39.es/ecma262/multipage/fundamental-objects.html#sec-native-error-types-used-in-this-standard> for the list of native errors.
fn is_native_error_name(name: &str) -> bool {
matches!(
name,
"EvalError"
| "RangeError"
| "ReferenceError"
| "SyntaxError"
| "TypeError"
| "URIError"
)
}

/// `typeof foo === 'number'` -> `typeof foo == 'number'`
fn try_compress_type_of_equal_string(&mut self, e: &mut BinaryExpression<'a>) {
let op = match e.operator {
Expand Down Expand Up @@ -1419,6 +1438,13 @@ mod test {
test("new Error('a')", "Error('a')");
test("new Error('a', { cause: b })", "Error('a', { cause: b })");
test_same("var Error; new Error()");
test("new EvalError()", "EvalError()");
test("new RangeError()", "RangeError()");
test("new ReferenceError()", "ReferenceError()");
test("new SyntaxError()", "SyntaxError()");
test("new TypeError()", "TypeError()");
test("new URIError()", "URIError()");
test("new AggregateError()", "AggregateError()");

test("new Function()", "Function()");
test(
Expand Down
12 changes: 6 additions & 6 deletions tasks/minsize/minsize.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -5,23 +5,23 @@ Original | minified | minified | gzip | gzip | Fixture

173.90 kB | 59.79 kB | 59.82 kB | 19.41 kB | 19.33 kB | moment.js

287.63 kB | 90.09 kB | 90.07 kB | 32.03 kB | 31.95 kB | jquery.js
287.63 kB | 90.08 kB | 90.07 kB | 32.03 kB | 31.95 kB | jquery.js

342.15 kB | 118.11 kB | 118.14 kB | 44.44 kB | 44.37 kB | vue.js

544.10 kB | 71.76 kB | 72.48 kB | 26.15 kB | 26.20 kB | lodash.js

555.77 kB | 273.21 kB | 270.13 kB | 90.93 kB | 90.80 kB | d3.js
555.77 kB | 273.16 kB | 270.13 kB | 90.92 kB | 90.80 kB | d3.js

1.01 MB | 460.18 kB | 458.89 kB | 126.77 kB | 126.71 kB | bundle.min.js

1.25 MB | 652.86 kB | 646.76 kB | 163.54 kB | 163.73 kB | three.js
1.25 MB | 652.84 kB | 646.76 kB | 163.54 kB | 163.73 kB | three.js

2.14 MB | 726.27 kB | 724.14 kB | 180.08 kB | 181.07 kB | victory.js
2.14 MB | 725.68 kB | 724.14 kB | 180.07 kB | 181.07 kB | victory.js

3.20 MB | 1.01 MB | 1.01 MB | 331.79 kB | 331.56 kB | echarts.js

6.69 MB | 2.32 MB | 2.31 MB | 492.64 kB | 488.28 kB | antd.js
6.69 MB | 2.32 MB | 2.31 MB | 492.63 kB | 488.28 kB | antd.js

10.95 MB | 3.49 MB | 3.49 MB | 907.45 kB | 915.50 kB | typescript.js
10.95 MB | 3.49 MB | 3.49 MB | 907.42 kB | 915.50 kB | typescript.js

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