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fix(es/minifier): typeof class should be function (#9522)
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**Related issue:**

Closes https://github.com/swc-project/swc/issues/9453
This commit is contained in:
CPunisher 2024-09-03 16:04:44 +08:00 committed by GitHub
parent 6bdc4f7e5e
commit c7fdd6b69b
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5 changed files with 19 additions and 6 deletions
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6
.changeset/six-hounds-hammer.md Normal file
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@ -0,0 +1,6 @@
---
swc_core: patch
swc_ecma_minifier: patch
---
fix(es/minifier): typeof class should be function rather than object

7
crates/swc_ecma_minifier/src/compress/optimize/inline.rs
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@ -156,7 +156,7 @@ impl Optimizer<'_> {
if !usage.reassigned {
match init {
Expr::Fn(..) | Expr::Arrow(..) => {
Expr::Fn(..) | Expr::Arrow(..) | Expr::Class(..) => {
self.typeofs.insert(ident.to_id(), "function".into());
}
Expr::Array(..) | Expr::Object(..) => {
@ -569,12 +569,9 @@ impl Optimizer<'_> {
if !usage.reassigned {
trace_op!("typeofs: Storing typeof `{}{:?}`", i.sym, i.ctxt);
match &*decl {
Decl::Fn(..) => {
Decl::Fn(..) | Decl::Class(..) => {
self.typeofs.insert(i.to_id(), "function".into());
}
Decl::Class(..) => {
self.typeofs.insert(i.to_id(), "object".into());
}
_ => {}
}
}

2
crates/swc_ecma_minifier/src/compress/optimize/ops.rs
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@ -370,7 +370,7 @@ impl Optimizer<'_> {
}
}
Expr::Arrow(..) | Expr::Fn(..) => {
Expr::Arrow(..) | Expr::Fn(..) | Expr::Class(..) => {
report_change!("Converting typeof to 'function' as we know the value");
self.changed = true;
*e = Lit::Str(Str {

8
crates/swc_ecma_minifier/tests/fixture/issues/9453/input.js Normal file
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@ -0,0 +1,8 @@
"use strict";
class x {}
const y = x;
const z = class {};
console.log(typeof x);
console.log(typeof y);
console.log(typeof z);
console.log(typeof class {});

2
crates/swc_ecma_minifier/tests/fixture/issues/9453/output.js Normal file
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@ -0,0 +1,2 @@
"use strict";
console.log("function"), console.log("function"), console.log("function"), console.log("function");